Mercedes-Benz R-Class:

vehicle shut down

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# 1  12/30/2010 5:32 PM

pcrumpe
New member
Registered: 12/30/2010
Posts: 2

vehicle shut down

Purchased car not quite a month ago and the nav system stopped showing the name last week.
Two days ago went to get in car yesterday and key would not open car, no lights on nothing. Seems a total electrical shut down. What could possibly be wrong. Would like an idea before calling tow company to have towed to a shop, could it be minor such as a dead battery? Please respond.

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# 2  12/30/2010 6:21 PM

TechHelp2
Administrator
Registered: 11/24/2009
Posts: 1299

Re: vehicle shut down

This is a Service bulletin I found on a dead battery. Your service technician should be aware of this. 

The remote door lock problem is probably caused by the dead battery but if it continues then it could be caused by an out of date program that needs to be reprogrammed to a newer version.

In the future more information would be helpful like the year of the car or truck, make model, engine size, gas or diesel and so on. The more information you give me on your vehicle the more information I can give you on your vehicles problem.

There are many reasons a battery can go dead like faulty battery, faulty modules not turning off, faulty charging system, bad grounds, shorts in the wiring and the list can go on. I hope the information below is helpful.

This is the bulletin below. This information I gave you is for a 2008.

I just took a shot at the year because you said it had GPS in it. Let me know if I was close on this information.

If I am wrong let me know the year and other information needed and I'll look into it further.

Date: March 11, 2009
Order No.: T-B-54.21/198f
Supersedes: T-B-54.21/198e dated Jan. 6, 2009
Group: 54

SUBJECT:
Model 164.122/172/177/186/822/871/886
Model 251.122/156/165
Model Year 2008:

Battery Discharging - Increased Rest Current in the Rear SAM / CAN Bus Awake Mode Software in Steering Column Module (SCM)
If you receive customer reports in the above model vehicles that the battery has completely discharged, this may be due to the following.

Note:
Before performing repairs as described below in Remedy 1 or 2, determine (by using Star Diagnosis) whether flashing was performed or if the upgraded part has already been installed. The battery discharge may be caused by any installed electronic device or accessory or could be inadvertently caused by customers action.
Cause 1 (Vehicles equipped with Automatic Rear End Door (SA code 890) or Keyless-Go (SA code 889):

Rest current being too high (>150mA but less then 3Amps) resulting from the rear SAM staying awake due to incorrect rest current logic. This situation may occur if the tailgate button on the key is pressed to open while vehicle is locked. Once the tailgate is closed again, the rear SAM remains awake before the tailgate lock switch and the spare wheel carrier switch close. If the spare wheel carrier is not installed (SA code 849), the SAM remains awake and drains the battery. The CAN bus however, is not awake in this case.

Note:
Remedy 1: As of November 21, 2008, Remedy 1 of this DTB must not be performed on the subject vehicles as it is covered by Service Campaign T-SC-2008110009. Combining Remedy 1 of this DTB with the referenced Campaign will result in a charge back.

Cause 2:
Battery discharges due to software issue in the Steering Column Module which causes the CAN bus to remain in awake mode (rest current >3Amps).

Remedy 2:
Replace the Steering Column Module (SCM) as per WIS document AR46.10-P-0300GZ (164) or AR46.10-P-0300RT (251).

As of end June 2008 production, Models 164 (VIN A441045) and 251 (VIN A089020) vehicles are fitted with an updated Steering Column Module.
Cause 3 (Vehicles equipped with Automatic Rear End Door (SA code 890) or Keyless-Go (SA code 889):

Battery discharges due to tailgate striker not adjusted properly. This may prevent the rear-end door control module (REDC) from recognizing when the latch is in the first detent position.

Remedy 3: Adjust the striker as below:
In the Y-direction: The liftgate lock must run into the center of the striker. If the gap dimensions are not in specification, correct at the hinge.
In the X-direction: The liftgate should be as flush as possible with the edges of the fender. Move the striker as far forward in the direction of travel without compromising the appearance of the liftgate flushness.

Note:
A slight recessed rear-end door increases the preload of the seal and improves the functional reliability of the power closing system.

Note:
The gap dimensions for the tailgate can be found in WIS documents AR72.20-P-3510GZ and AR72.20-P-3510RT.
After all modifications have been completed, perform a function test to verify that the liftgate closing assist system is operating correctly on a consistent basis. The liftgate must be pulled closed (to the main detent) by the power closing mechanism without fail.


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# 3  12/30/2010 6:38 PM

pcrumpe
New member
Registered: 12/30/2010
Posts: 2

Re: vehicle shut down

this is a 2006 Mercedes benz r 500 suv.  Would still like to know whether you recommend me getting towed to repair shop or try first to recharge car battery.

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# 4  12/30/2010 9:59 PM

TechHelp2
Administrator
Registered: 11/24/2009
Posts: 1299

Re: vehicle shut down

It's always good to charge the battery overnight to see if the vehicle will start. When it does start checking the charging system functions and operation is the next step.

If you continue to have problems or if the battery discharges quickly then professional service is recommended.

Going to your local Mercedes dealer and giving them your vehicle identification number (VIN) can help them look up the history of the vehicle and tell you if any recalls or service bulletins about the symptoms you are having need to be addressed.

Try the overnight charging first then go from there.

Let me know how you make out.


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