Battery Discharge, Increased No-Load Current Caused By Rear SAM And/Or Steering Column Tube Switch Module (LI54.10-P-051955)
Publication date: 2011-06-06Reference number: LI54.10-P-051955
BATTERY DISCHARGE, INCREASED NO-LOAD CURRENT CAUSED BY REAR SAM AND/OR STEERING COLUMN TUBE SWITCH MODULE
TECHNICAL SERVICE BULLETIN
Reference Number(s): LI54.10-P-051955 Version 1, Date of Issue:
June 6, 2011
| Mercedes-Benz: | Steering column tube problem: 164, 251 with SA code 808 and 494; Rear SAM problem: Model series 164 and model series 251, W/X164: A298504 - A370977, W/V251: A062281- A076569 without SA code 849 (Spare tire holder) and with SA code 551 (Anti-theft alarm system) and SA code 890 (Automatic rear-end door) or 889 (Keyless- Go) |
| Design Group: | 54.10 Battery, voltage supply, voltage converter |
| Reason For Change: | Validity for SAM problem adapted |
COMPLAINT
No-load current too high, causing discharge of the battery.
CAUSE
Two possible causes have been defined:
- When the remote trunk lid release is operated on a secured (locked) vehicle, the lid is automatically unlocked and opened. When the trunk lid is closed, the rear SAM remains awake until both the trunk lid lock contact and the spare tire carrier contact are closed again. If there is no spare tire carrier installed, the rear SAM remains permanently awake until the next time the vehicle is unlocked/locked due to a software error, and this causes the battery to discharge. The CAN bus is not kept awake.
- The steering column tube switch module is keeping the CAN bus awake due to a software error.
The fault has been rectified as of 01/08 at the factory with VIN ... A370977 (for model series 164) and ... A076569 (for model series 251).
The fault has been rectified as of 07/08 at the factory with VIN ... A441045 (for model series 164) and ... A089020 (for model series 251).
REMEDY
- Software update of rear SAM as of DVD 07/2008.
- Replacement of steering column tube switch module (part no. A 164 545 85 16)
Check VMI to see if the vehicle is flagged for Service Campaign 2008110009 . If it is, and you are using software that is more recent than DVD 04/09, please close out the campaign for the vehicle.
SYMPTOMS
SYMPTOMS
| Battery function / Battery discharges / Overall vehicle / Power supply / Battery/On-board electrical system / |
PARTS
PARTS
| Part number | Designation | Qty | Note | EPC | Non- EPC |
|---|---|---|---|---|---|
| A1645458516 | Steering angle sensor control unit | 1 | X |