NHTSA owner reports · September 18, 2026 snapshot.
Electronic Stability Control (esc) complaints
10 reportsClear category filter106,500 miles · Dec 31, 2017
Electrical SystemElectronic Stability Control (esc)Service Brakes
I WAS DRIVING ON A BUSY INTERSECTION IN MY 2002 MERCEDES BENZ ML320 WHEN DRIVING THE YELLOW TRIANGLE IN THE SPEEDOMETER STARTS TO FLASH AND ALL THE BREAKS LOCK UP, THIS IS FOLLOWED BY A STALL, THANKFULLY I WAS ABLE TO PULL OFF TO THE SIDE OF THE ROAD WITHOUT BEING HIT. AFTER DOING SOME RESEARCH I DISCOVERED THAT MANY MERCEDES ML…
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I WAS DRIVING ON A BUSY INTERSECTION IN MY 2002 MERCEDES BENZ ML320 WHEN DRIVING THE YELLOW TRIANGLE IN THE SPEEDOMETER STARTS TO FLASH AND ALL THE BREAKS LOCK UP, THIS IS FOLLOWED BY A STALL, THANKFULLY I WAS ABLE TO PULL OFF TO THE SIDE OF THE ROAD WITHOUT BEING HIT. AFTER DOING SOME RESEARCH I DISCOVERED THAT MANY MERCEDES ML320 OWNERS WERE HAVING THIS SAME PROBLEM. SPECIFICALLY THE YAW RATE SENSOR. THIS IS A SERIOUS LIFE THREATENING ISSUE THAT CAN INJURE OR WORSE YET KILL SOMEONE. YOU GUYS NEED TO DO A RECALL BEFORE SOMEONE DIES!
NHTSA ODI #11057753
135,000 miles · Nov 3, 2016
Electronic Stability Control (esc)Service Brakes
ON NUMEROUS OCCASIONS OCCURRING IN DIFFERENT CONDITIONS REGARDING SPEED, WEATHER, ROAD CONDITIONS, ETC., I HAVE HAD THE VEHICLE PULL HARD TO THE RIGHT WHILE ENGAGING THE FRONT BRAKES, BOTH WHILE TURNING THE VEHICLE AND ON STRAIGHTAWAYS. WHEN THIS OCCURS, THE TRIANGLE HAZARD LIGHT AND ESP LIGHTS START FLASHING. MOST OFTEN I HA…
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ON NUMEROUS OCCASIONS OCCURRING IN DIFFERENT CONDITIONS REGARDING SPEED, WEATHER, ROAD CONDITIONS, ETC., I HAVE HAD THE VEHICLE PULL HARD TO THE RIGHT WHILE ENGAGING THE FRONT BRAKES, BOTH WHILE TURNING THE VEHICLE AND ON STRAIGHTAWAYS. WHEN THIS OCCURS, THE TRIANGLE HAZARD LIGHT AND ESP LIGHTS START FLASHING. MOST OFTEN I HAVE BEEN ABLE TO PULL OFF TO THE SIDE OF THE ROAD, THANKFULLY SAFELY, OR ON ONE OCCASION STOP IN THE MIDDLE OF THE ROAD AS THE CAR WOULDN'T ALLOW ME TO CONTINUE DRIVING WHICH WAS INCREDIBLY DANGEROUS AND SCARY. I HAVE TAKEN IT TO THE DEALERSHIP WHO REPLACED THE FRONT BRAKE SENSORS, WHICH DIDN'T FIX THE PROBLEM, AND RETURNED TO HAVE THEM AGAIN DIAGNOSE THE ISSUE AND DECLINED THEIR RECOMMENDATIONS SUCH AS REPLACING THE BACK BRAKE SENSORS, UNTIL I CAME UPON THE REPEATED ISSUES OF THE STABILITY SENSORS FAILING (SPECIFICALLY THE YAW SENSOR). I CAN'T BELIEVE THAT, TO DATE, THIS HAS NOT BEEN A RECALL ISSUE AND NO ONE HAS BEEN SERIOUSLY INJURED OR KILLED DUE TO THIS PROBLEM (I FILED A PREVIOUS CLAIM, BUT THE WEBSITE WENT UNDER MAINTENANCE AND CLOSED MY COMPLAINT AS I WAS FILING AND WAS GIVEN ID #10923983, BUT THERE IS NO INFORMATION FILED IN ASSOCIATION THAT I COULD FIND HENCE THE RE-FILING). *TR
NHTSA ODI #10923995
135,000 miles · Nov 3, 2016
Electronic Stability Control (esc)Service Brakes
ON MULTIPLE OCCASIONS AND NUMEROUS DIFFERENT SPEEDS, WEATHER, BOTH DRIVING ON A STRAIGHTAWAY OR TURNING, AND OTHER ROAD CONDITIONS, THE FRONT BRAKES HAVE LOCKED UP ON THE CAR CAUSING IT TO VEER RIGHT WHILE ENGAGING THE BRAKES. MOST OFTEN I HAVE HAD TO PULL OVER, THANKFULLY SAFELY, OR ON ONE OCCASION, STOP IN THE MIDDLE OF THE R…
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ON MULTIPLE OCCASIONS AND NUMEROUS DIFFERENT SPEEDS, WEATHER, BOTH DRIVING ON A STRAIGHTAWAY OR TURNING, AND OTHER ROAD CONDITIONS, THE FRONT BRAKES HAVE LOCKED UP ON THE CAR CAUSING IT TO VEER RIGHT WHILE ENGAGING THE BRAKES. MOST OFTEN I HAVE HAD TO PULL OVER, THANKFULLY SAFELY, OR ON ONE OCCASION, STOP IN THE MIDDLE OF THE ROAD TO TURN THE CAR OFF TO BE ABLE TO CONTINUE DRIVING WHICH IS INCREDIBLY DANGEROUS AND SCARY. I'VE TAKEN IT TO THE DEALERSHIP AND THEY HAD ME REPLACE THE BRAKE SENSORS WHICH WERE OBVIOUSLY NOT THE PROBLEM AND THEN RECOMMENDED OTHER REPLACEMENTS, SINCE THE PROBLEM CONTINUED, THAT I DECLINED UNTIL I FOUND THAT THIS WAS A COMMON PROBLEM WITH THE STABILITY SENSORS IN THIS VEHICLE (SPECIFICALLY THE YAW SENSOR). I'M AMAZED THIS IS NOT A RECALL SITUATION AND THAT NO ONE HAS BEEN SERIOUSLY INJURED OR KILLED DUE TO THIS PROBLEM. *TR
NHTSA ODI #10923983
180 miles · Jun 19, 2016
Electrical SystemElectronic Stability Control (esc)Steering
I HAVE A 2002 ML320, THE RADIO IS OUT AND THE HOLE CLAMP USED TO SECURE THE POWER STEERING FLUID DOES NOT PROVIDE SUFFICIENT CLAMPING CAUSING A LEAK, ESP/BAS STAYS ON CAUSING LOW TRACTION AND THE DOOR LOCK. THESE ITEMS WERE RECALLED ON THE M-CLASS 320, WHAT HAPPENED TO THES RECALLS.
NHTSA ODI #10875060
139,000 miles · Jun 2, 2015
Electronic Stability Control (esc)Service Brakes
TL* THE CONTACT OWNS A 2002 MERCEDES BENZ ML320. WHILE DRIVING APPROXIMATELY 45 MPH, THE FRONT BRAKES ACTIVATED INDEPENDENTLY. THE CONTACT NOTICED THAT THE FRONT ROTORS WERE RED AND HOT. THE ESP WARNING LIGHT ILLUMINATED. THE CONTACT DISCONNECTED THE ESP CABLE AND CONTINUED TO DRIVE THE VEHICLE. THE MANUFACTURER WAS NOT NOTIFIED…
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TL* THE CONTACT OWNS A 2002 MERCEDES BENZ ML320. WHILE DRIVING APPROXIMATELY 45 MPH, THE FRONT BRAKES ACTIVATED INDEPENDENTLY. THE CONTACT NOTICED THAT THE FRONT ROTORS WERE RED AND HOT. THE ESP WARNING LIGHT ILLUMINATED. THE CONTACT DISCONNECTED THE ESP CABLE AND CONTINUED TO DRIVE THE VEHICLE. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURES. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE VIN WAS UNAVAILABLE. THE APPROXIMATE FAILURE MILEAGE WAS 139,000. UPDATED 7/21/15*CN UPDATED 10/18/2017*CN
NHTSA ODI #10723025
149,000 miles · May 13, 2014
Electronic Stability Control (esc)Service BrakesSteering
WHILE DRIVING ON THE HIGHWAY AT 60MPH THE VEHICLE STARTED SHAKING VIOLENTLY. THE BRAKES STARTED ENGAGING ON THEIR OWN PULLING THE CAR TO THE LEFT AND RIGHT AND NEARLY BRINGING THE CAR TO A SUDDEN STOP. IT TOOK A LOT OF EFFORT TO KEEP THE VEHICLE FROM PULLING INTO THE OTHER LANES AND CAUSING AN ACCIDENT. THE BAS/ESP LIGHT CAME ON…
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WHILE DRIVING ON THE HIGHWAY AT 60MPH THE VEHICLE STARTED SHAKING VIOLENTLY. THE BRAKES STARTED ENGAGING ON THEIR OWN PULLING THE CAR TO THE LEFT AND RIGHT AND NEARLY BRINGING THE CAR TO A SUDDEN STOP. IT TOOK A LOT OF EFFORT TO KEEP THE VEHICLE FROM PULLING INTO THE OTHER LANES AND CAUSING AN ACCIDENT. THE BAS/ESP LIGHT CAME ON THE DASH AND HAS STAYED ON NOW. THIS ALL LASTED FOR ABOUT 10 SECONDS. I WAS IN THE 3RD LANE OF A 4 LANE HIGHWAY DURING MODERATE TRAFFIC. I WAS ALMOST REAR ENDED BY TWO DIFFERENT VEHICLES. I HAVE BEEN RESEARCHING THIS ISSUE AND FOUND MANY OTHER DRIVERS WITH THE SAME THING. THIS IS A DANGEROUS DEFECT AND NEEDS TO BE ADDRESSED. IT DOESN'T TAKE MUCH FOR A SUDDEN CHANGE IN DIRECTION AND SPEED TO CAUSE A SEVERE ACCIDENT WHEN DRIVING ON THE HIGHWAY, AND KNOWING THAT THIS VEHICLE IS CAPABLE AND KNOW FOR DOING THIS MAKES IT VERY DANGEROUS. IT MAKES ME WONDER HOW MANY FATAL ACCIDENTS HAVE OCCURRED DUE TO THIS PROBLEM, BUT NO ONE KNEW BECAUSE IT WAS JUST ASSUMED THE TO BE DRIVER ERROR. *TR
NHTSA ODI #10587996
129,000 miles · Nov 8, 2012
Electronic Stability Control (esc)Service BrakesSteering
FRONT PASSENGER SIDE WHEEL BRAKE ON IT'S OWN, PULLING ME OFF TO THE LEFT OF THE ROAD VEHICLE BRAKE (RIGHT SIDE) STAYED ENGAGED UNTIL VEHICLE SPEED WAS DOWN TO ABOUT 20 MPH. DEALER SAID A BAD YAW RATE SENSOR WAS THE PROBLEM. *TR
NHTSA ODI #10483756
112,000 miles · Jan 9, 2011
Electronic Stability Control (esc)Vehicle Speed Control
TO WHOM IT MAY CONCERN, I HAD A NEAR DEATH EXPERIENCE WHILE DRIVING ONE OF YOUR VEHICLES. I AM THE OWNER OF A MERCEDES 2002 ML320, WHICH WAS PURCHASED AT A PHILLIPS MERCEDES DEALERSHIP IN VIRGINIA BEACH VA. I NEED TO ADDRESS A VERY SERIOUS INCIDENT THAT OCCURRED OVER THE WEEKEND (DECEMBER 18, 2010). I WAS DRIVING BACK FROM RIC…
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TO WHOM IT MAY CONCERN, I HAD A NEAR DEATH EXPERIENCE WHILE DRIVING ONE OF YOUR VEHICLES. I AM THE OWNER OF A MERCEDES 2002 ML320, WHICH WAS PURCHASED AT A PHILLIPS MERCEDES DEALERSHIP IN VIRGINIA BEACH VA. I NEED TO ADDRESS A VERY SERIOUS INCIDENT THAT OCCURRED OVER THE WEEKEND (DECEMBER 18, 2010). I WAS DRIVING BACK FROM RICHMOND GOING TOWARD VIRGINIA BEACH, I WAS DRIVING 70 MPH ON I-64 AND HAD IT ON CRUISE CONTROL, AHEAD I SAW THAT TRAFFIC SLOWING DOWN SO I STEPPED ON THE BREAK; I THEN REALIZED THAT MY BRAKES WEREN'T WORKING AND I WAS UNABLE TO STOP OR SLOW THE CAR DOWN. I ATTEMPTED TO PUSH THE BREAK PEDAL DOWN AND IT WOULDN'T NUDGE EVEN THOUGH I APPLIED ALL OF MY WEIGHT TO IT, THE SPEED DID NOT DIMINISH AT ALL, I THEN TRIED THE EMERGENCY BRAKE AND THAT ALSO FAILED TO SLOW ME DOWN, MY FRIEND SUGGESTED THAT I PUT THE CAR IN NEUTRAL AND THEN TRY THE BRAKE, FORTUNATELY THAT WORKED AND WAS FINALLY ABLE TO COME TO A COMPLETE STOP. IT WAS ONE OF THE SCARIEST EXPERIENCES OF MY LIFE. YOUR PRODUCT PUT MY FRIEND'S AND MY LIFE IN JEOPARDY. I HAD THE BAS/ESP LIGHT COME ON IN THE PASS AND HAVE BROUGHT IT IN FOR REPAIRS 3 TIMES ALREADY: 07/27/2005, 12/01/2009 AND IN 10/19/2010. I AM STUNNED THAT A COMPANY WHO HAS SUCH A GREAT REPUTATION AND SEEMS TO THRIVE ON CUSTOMER SATISFACTION DROPPED THE BALL. AT NO POINT IN TIME DID ANY OF THE TECHNICIANS WHO PERFORMED THE REPAIRS ON MY CAR ADVISE ME OF THE POTENTIAL DANGER. *TR
NHTSA ODI #10375310
105,003 miles · Oct 31, 2008
Electronic Stability Control (esc)Vehicle Speed Control
WAS DRIVING VEHICLE ON HIGHWAY AT 75 MPH SET SPEED IN CRUISE CONTROL AND STEPPED ON BRAKE AS I APPROACHED TRAFFIC CONGESTION. VEHICLE WOULD NOT STOP AND CONTINUED TO MAINTAIN SET SPEED REGARDLESS HOW HARD I PRESSED ON THE BRAKE. EVENTUALLY, I DECIDED TO TRY SHIFTING INTO NEUTRAL AND THE VEHICLE WAS PLACED BACK UNDER CONTROL OF T…
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WAS DRIVING VEHICLE ON HIGHWAY AT 75 MPH SET SPEED IN CRUISE CONTROL AND STEPPED ON BRAKE AS I APPROACHED TRAFFIC CONGESTION. VEHICLE WOULD NOT STOP AND CONTINUED TO MAINTAIN SET SPEED REGARDLESS HOW HARD I PRESSED ON THE BRAKE. EVENTUALLY, I DECIDED TO TRY SHIFTING INTO NEUTRAL AND THE VEHICLE WAS PLACED BACK UNDER CONTROL OF THE FOOTBRAKE. THANKFULLY, THE VEHICLE WAS SLOWED DOWN WITHOUT INCIDENT BUT IT WAS A VERY SCARY MOMENT. NOTICED, AT THIS TIME, THE BAS/ESP MALFUNCTION INDICATOR LAMP WAS DISPLAYED ON THE DASHBOARD. DROVE VEHICLE DIRECTLY TO A MERCEDES DEALERSHIP FOR REPAIRS. DEALER ADVISED STOP LAMP SWITCH SHORTED. REPLACED LAMP SWITCH. ALTHOUGH, THIS WAS THE FIRST INCIDENT WHILE IN CRUISE CONTROL THE VEHICLE DID HAVE SIMILAR PAST PROBLEMS WITH THE BRAKING SYSTEM (IE-BRAKE SWITCH AND SHIFTER CONTROL MODULE WERE REPLACED) THAT PREVENTED SHIFTING OUT OF PARK INTO ANY OTHER POSITION. VEHICLE SHOULD HAVE SAFETY DEVICE TO OVERRIDE "CRUISE CONTROL" OR PREVENT "CRUISE CONTROL" OPERATION WITH ANY MALFUNCTION IN THE BRAKING SYSTEM OR ACTIVATION OF THE BRAKING INDICATOR LAMP. WHAT ASSURANCES ARE THERE TO PREVENT THIS FROM HAPPENING AGAIN? *TR
NHTSA ODI #10247405
Mileage unknown · Jul 27, 2008
Electrical SystemElectronic Stability Control (esc)
THIS CAR HAS BEEN INTO SERVICE OV 27 TIME IN THE LAST 2 1/2 YEARS REGARDING THE ELECTRICAL SYSTEM/ ALL OF THE LIGHT ON THE DASH BOARD TURN ON. MY LASTEST ISSUE WAS ON THE HIGHWAY MY CAR JUST COMPLETELY TURN OFF ON ME WILL ON THE EXPRESSWAY WHEN I TURNED THE KEY AGAIN THE WARNING LIGHT CAME ON THIS CAR HAS BEEN FIX NUMEROUS TIME…
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THIS CAR HAS BEEN INTO SERVICE OV 27 TIME IN THE LAST 2 1/2 YEARS REGARDING THE ELECTRICAL SYSTEM/ ALL OF THE LIGHT ON THE DASH BOARD TURN ON. MY LASTEST ISSUE WAS ON THE HIGHWAY MY CAR JUST COMPLETELY TURN OFF ON ME WILL ON THE EXPRESSWAY WHEN I TURNED THE KEY AGAIN THE WARNING LIGHT CAME ON THIS CAR HAS BEEN FIX NUMEROUS TIMES BUT THE PROBLEM COMES BACK. *TR
NHTSA ODI #10235901
NHTSA investigations
1PE10050 · Brake Lamp Switch Failure.
Opened Dec 21, 2010 · Closed May 4, 2011
Status: closed (inferred from source dates) · Exterior Lighting:brake Lights:switch; Service Brakes, Hydraulic; Vehicle Speed Control; Vehicle Speed Control:cruise Control
ODI opened the investigation based on reports that the subject vehicle brake lamp switch (switch) failure caused 1) inoperative brake lamps (stay on or fail to illuminate), and/or 2) shift interlock failure (shifter locked in park), and/or 3) the cruise control to fail to cancel with brake application.Consumers also reported the illumination of a warning lamp on the instrument panel.The switch contains three sets of electrical contacts and a (normally extended) spring loaded plunger that actuates the contacts as it moves.As installed in the vehicle, the plunger contacts the brake pedal arm and is pushed into the switch; as the driver applies the pedal the plunger extends.One set of contacts (BLS) operates the stop lamps, a second set (EWM) controls the shift interlock system, and a third set (BS) is used by an on-board diagnostic (OBD) system to monitor switch operation.The cruise control monitors the BLS signal to determine when the brake is applied, the primary way the system is disabled when set.The relative timing of contact actuation in response to plunger movement allows the OBD system to detect a switch fault.When a fault is detected a malfunction indication lamp (MIL) is illuminated (driver alert), a diagnostic trouble code (DTC) is stored (for the service technician), and cruise control operation is inhibited (as a failsafe).In its response to ODI's January 2011 information request letter, MB explained its assessment of switch failures which was based primarily on evaluation of field return failures.MB identified both 1) electrical contact and 2) mechanical switch failure mechanisms.According to MB's analysis, electrical contact failure is the predominate failure type and the failure consequence depends on which contact fails.For instance MB claims that BLS contact failures are momentary in nature and do not affect brake light operation but are nonetheless detected by the OBD system, resulting in a DTC and subsequent replacement.Electrical contact failures of the BS and EWM contacts result in a DTC also, and EWM contact failures result in the shifter being stuck in the park (which can be overridden by the consumer).Accordingly MB maintains that electrical contact failures of the switch have no safety consequence since the brake lamps remain operational and the cruise control is always disabled.MB determined that mechanical failures of the switch, which are rare in their assessment, can result from internal wear and/or increased switch operating temperatures.High temperatures occur due to overheating of the BLS contacts and can cause the internal plastic components to melt.In one scenario overheated BLS contacts may melt to the extended plunger and are damaged when the brake pedal is released resulting in the brake lights staying on.In another scenario the increased temperatures and/or internal wear can cause the plunger to stick in the fully depressed position.In this case the cruise may not cancel when the brake is applied and the driver may have to use high brake pedal forces or other means (shifting to neutral or using the cruise master switch) to disengage the cruise.Additionally the vacuum assist can be depleted if the driver pumps the brakes resulting in reduced braking effectiveness and even higher pedal forces.In its March 31, 2011 defect notification, MB stated that to remediate the potential need for excessive brake force it would conduct a safety recall (11V-208) to replace the switch with a more robustly designed component.The recall includes 136,751 model year 2000 - 2002 M-Class and model year 2000 - 2004 M-Class AMG vehicles.Owner notification letters will be mailed
Additional source detail variants (4)
Exterior Lighting:brake Lights:switch
ODI opened the investigation based on reports that the subject vehicle brake lamp switch (switch) failure caused 1) inoperative brake lamps (stay on or fail to illuminate), and/or 2) shift interlock failure (shifter locked in park), and/or 3) the cruise control to fail to cancel with brake application.Consumers also reported the illumination of a warning lamp on the instrument panel.The switch contains three sets of electrical contacts and a (normally extended) spring loaded plunger that actuates the contacts as it moves.As installed in the vehicle, the plunger contacts the brake pedal arm and is pushed into the switch; as the driver applies the pedal the plunger extends.One set of contacts (BLS) operates the stop lamps, a second set (EWM) controls the shift interlock system, and a third set (BS) is used by an on-board diagnostic (OBD) system to monitor switch operation.The cruise control monitors the BLS signal to determine when the brake is applied, the primary way the system is disabled when set.The relative timing of contact actuation in response to plunger movement allows the OBD system to detect a switch fault.When a fault is detected a malfunction indication lamp (MIL) is illuminated (driver alert), a diagnostic trouble code (DTC) is stored (for the service technician), and cruise control operation is inhibited (as a failsafe).In its response to ODI's January 2011 information request letter, MB explained its assessment of switch failures which was based primarily on evaluation of field return failures.MB identified both 1) electrical contact and 2) mechanical switch failure mechanisms.According to MB's analysis, electrical contact failure is the predominate failure type and the failure consequence depends on which contact fails.For instance MB claims that BLS contact failures are momentary in nature and do not affect brake light operation but are nonetheless detected by the OBD system, resulting in a DTC and subsequent replacement.Electrical contact failures of the BS and EWM contacts result in a DTC also, and EWM contact failures result in the shifter being stuck in the park (which can be overridden by the consumer).Accordingly MB maintains that electrical contact failures of the switch have no safety consequence since the brake lamps remain operational and the cruise control is always disabled.MB determined that mechanical failures of the switch, which are rare in their assessment, can result from internal wear and/or increased switch operating temperatures.High temperatures occur due to overheating of the BLS contacts and can cause the internal plastic components to melt.In one scenario overheated BLS contacts may melt to the extended plunger and are damaged when the brake pedal is released resulting in the brake lights staying on.In another scenario the increased temperatures and/or internal wear can cause the plunger to stick in the fully depressed position.In this case the cruise may not cancel when the brake is applied and the driver may have to use high brake pedal forces or other means (shifting to neutral or using the cruise master switch) to disengage the cruise.Additionally the vacuum assist can be depleted if the driver pumps the brakes resulting in reduced braking effectiveness and even higher pedal forces.In its March 31, 2011 defect notification, MB stated that to remediate the potential need for excessive brake force it would conduct a safety recall (11V-208) to replace the switch with a more robustly designed component.The recall includes 136,751 model year 2000 - 2002 M-Class and model year 2000 - 2004 M-Class AMG vehicles.Owner notification letters will be mailed
Service Brakes, Hydraulic
ODI opened the investigation based on reports that the subject vehicle brake lamp switch (switch) failure caused 1) inoperative brake lamps (stay on or fail to illuminate), and/or 2) shift interlock failure (shifter locked in park), and/or 3) the cruise control to fail to cancel with brake application.Consumers also reported the illumination of a warning lamp on the instrument panel.The switch contains three sets of electrical contacts and a (normally extended) spring loaded plunger that actuates the contacts as it moves.As installed in the vehicle, the plunger contacts the brake pedal arm and is pushed into the switch; as the driver applies the pedal the plunger extends.One set of contacts (BLS) operates the stop lamps, a second set (EWM) controls the shift interlock system, and a third set (BS) is used by an on-board diagnostic (OBD) system to monitor switch operation.The cruise control monitors the BLS signal to determine when the brake is applied, the primary way the system is disabled when set.The relative timing of contact actuation in response to plunger movement allows the OBD system to detect a switch fault.When a fault is detected a malfunction indication lamp (MIL) is illuminated (driver alert), a diagnostic trouble code (DTC) is stored (for the service technician), and cruise control operation is inhibited (as a failsafe).In its response to ODI's January 2011 information request letter, MB explained its assessment of switch failures which was based primarily on evaluation of field return failures.MB identified both 1) electrical contact and 2) mechanical switch failure mechanisms.According to MB's analysis, electrical contact failure is the predominate failure type and the failure consequence depends on which contact fails.For instance MB claims that BLS contact failures are momentary in nature and do not affect brake light operation but are nonetheless detected by the OBD system, resulting in a DTC and subsequent replacement.Electrical contact failures of the BS and EWM contacts result in a DTC also, and EWM contact failures result in the shifter being stuck in the park (which can be overridden by the consumer).Accordingly MB maintains that electrical contact failures of the switch have no safety consequence since the brake lamps remain operational and the cruise control is always disabled.MB determined that mechanical failures of the switch, which are rare in their assessment, can result from internal wear and/or increased switch operating temperatures.High temperatures occur due to overheating of the BLS contacts and can cause the internal plastic components to melt.In one scenario overheated BLS contacts may melt to the extended plunger and are damaged when the brake pedal is released resulting in the brake lights staying on.In another scenario the increased temperatures and/or internal wear can cause the plunger to stick in the fully depressed position.In this case the cruise may not cancel when the brake is applied and the driver may have to use high brake pedal forces or other means (shifting to neutral or using the cruise master switch) to disengage the cruise.Additionally the vacuum assist can be depleted if the driver pumps the brakes resulting in reduced braking effectiveness and even higher pedal forces.In its March 31, 2011 defect notification, MB stated that to remediate the potential need for excessive brake force it would conduct a safety recall (11V-208) to replace the switch with a more robustly designed component.The recall includes 136,751 model year 2000 - 2002 M-Class and model year 2000 - 2004 M-Class AMG vehicles.Owner notification letters will be mailed
Vehicle Speed Control:cruise Control
ODI opened the investigation based on reports that the subject vehicle brake lamp switch (switch) failure caused 1) inoperative brake lamps (stay on or fail to illuminate), and/or 2) shift interlock failure (shifter locked in park), and/or 3) the cruise control to fail to cancel with brake application.Consumers also reported the illumination of a warning lamp on the instrument panel.The switch contains three sets of electrical contacts and a (normally extended) spring loaded plunger that actuates the contacts as it moves.As installed in the vehicle, the plunger contacts the brake pedal arm and is pushed into the switch; as the driver applies the pedal the plunger extends.One set of contacts (BLS) operates the stop lamps, a second set (EWM) controls the shift interlock system, and a third set (BS) is used by an on-board diagnostic (OBD) system to monitor switch operation.The cruise control monitors the BLS signal to determine when the brake is applied, the primary way the system is disabled when set.The relative timing of contact actuation in response to plunger movement allows the OBD system to detect a switch fault.When a fault is detected a malfunction indication lamp (MIL) is illuminated (driver alert), a diagnostic trouble code (DTC) is stored (for the service technician), and cruise control operation is inhibited (as a failsafe).In its response to ODI's January 2011 information request letter, MB explained its assessment of switch failures which was based primarily on evaluation of field return failures.MB identified both 1) electrical contact and 2) mechanical switch failure mechanisms.According to MB's analysis, electrical contact failure is the predominate failure type and the failure consequence depends on which contact fails.For instance MB claims that BLS contact failures are momentary in nature and do not affect brake light operation but are nonetheless detected by the OBD system, resulting in a DTC and subsequent replacement.Electrical contact failures of the BS and EWM contacts result in a DTC also, and EWM contact failures result in the shifter being stuck in the park (which can be overridden by the consumer).Accordingly MB maintains that electrical contact failures of the switch have no safety consequence since the brake lamps remain operational and the cruise control is always disabled.MB determined that mechanical failures of the switch, which are rare in their assessment, can result from internal wear and/or increased switch operating temperatures.High temperatures occur due to overheating of the BLS contacts and can cause the internal plastic components to melt.In one scenario overheated BLS contacts may melt to the extended plunger and are damaged when the brake pedal is released resulting in the brake lights staying on.In another scenario the increased temperatures and/or internal wear can cause the plunger to stick in the fully depressed position.In this case the cruise may not cancel when the brake is applied and the driver may have to use high brake pedal forces or other means (shifting to neutral or using the cruise master switch) to disengage the cruise.Additionally the vacuum assist can be depleted if the driver pumps the brakes resulting in reduced braking effectiveness and even higher pedal forces.In its March 31, 2011 defect notification, MB stated that to remediate the potential need for excessive brake force it would conduct a safety recall (11V-208) to replace the switch with a more robustly designed component.The recall includes 136,751 model year 2000 - 2002 M-Class and model year 2000 - 2004 M-Class AMG vehicles.Owner notification letters will be mailed
Vehicle Speed Control
ODI opened the investigation based on reports that the subject vehicle brake lamp switch (switch) failure caused 1) inoperative brake lamps (stay on or fail to illuminate), and/or 2) shift interlock failure (shifter locked in park), and/or 3) the cruise control to fail to cancel with brake application.Consumers also reported the illumination of a warning lamp on the instrument panel.The switch contains three sets of electrical contacts and a (normally extended) spring loaded plunger that actuates the contacts as it moves.As installed in the vehicle, the plunger contacts the brake pedal arm and is pushed into the switch; as the driver applies the pedal the plunger extends.One set of contacts (BLS) operates the stop lamps, a second set (EWM) controls the shift interlock system, and a third set (BS) is used by an on-board diagnostic (OBD) system to monitor switch operation.The cruise control monitors the BLS signal to determine when the brake is applied, the primary way the system is disabled when set.The relative timing of contact actuation in response to plunger movement allows the OBD system to detect a switch fault.When a fault is detected a malfunction indication lamp (MIL) is illuminated (driver alert), a diagnostic trouble code (DTC) is stored (for the service technician), and cruise control operation is inhibited (as a failsafe).In its response to ODI's January 2011 information request letter, MB explained its assessment of switch failures which was based primarily on evaluation of field return failures.MB identified both 1) electrical contact and 2) mechanical switch failure mechanisms.According to MB's analysis, electrical contact failure is the predominate failure type and the failure consequence depends on which contact fails.For instance MB claims that BLS contact failures are momentary in nature and do not affect brake light operation but are nonetheless detected by the OBD system, resulting in a DTC and subsequent replacement.Electrical contact failures of the BS and EWM contacts result in a DTC also, and EWM contact failures result in the shifter being stuck in the park (which can be overridden by the consumer).Accordingly MB maintains that electrical contact failures of the switch have no safety consequence since the brake lamps remain operational and the cruise control is always disabled.MB determined that mechanical failures of the switch, which are rare in their assessment, can result from internal wear and/or increased switch operating temperatures.High temperatures occur due to overheating of the BLS contacts and can cause the internal plastic components to melt.In one scenario overheated BLS contacts may melt to the extended plunger and are damaged when the brake pedal is released resulting in the brake lights staying on.In another scenario the increased temperatures and/or internal wear can cause the plunger to stick in the fully depressed position.In this case the cruise may not cancel when the brake is applied and the driver may have to use high brake pedal forces or other means (shifting to neutral or using the cruise master switch) to disengage the cruise.Additionally the vacuum assist can be depleted if the driver pumps the brakes resulting in reduced braking effectiveness and even higher pedal forces.In its March 31, 2011 defect notification, MB stated that to remediate the potential need for excessive brake force it would conduct a safety recall (11V-208) to replace the switch with a more robustly designed component.The recall includes 136,751 model year 2000 - 2002 M-Class and model year 2000 - 2004 M-Class AMG vehicles.Owner notification letters will be mailed
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