Campaign - BAS Control Module Inspection/Replacement (1998110001)

CAMPAIGN - BAS CONTROL MODULE INSPECTION/REPLACEMENT

SERVICE CAMPAIGN BULLETIN

SUBJECT

BAS CONTROL MODULE INSPECTION/REPLACEMENT

Update: Correction/addition to Effective Serial Number Range, Parts Information, and Warranty Information tables; supersedes P-SC-1998110001 dated January, 1999.

SERVICE INFORMATION

The brake assist (BAS) malfunction warning indicator may illuminate on vehicles within the following effective serial number ranges if the driver applies the brake and accelerator pedals simultaneously. In this case, illumination of the BAS malfunction warning indicator does not reflect a brake system malfunction nor does it affect the system's operation other than the light illumination. To prevent the BAS malfunction warning indicator from illuminating unnecessarily as a result of simultaneous brake and accelerator pedal application, the BAS control module must be inspected and replaced. Please note that a vehicle with an illuminated BAS malfunction warning indicator should, in all cases, be brought to a Mercedes-Benz Center for inspection and repair, as may be required, as soon as possible.

Following is the inspection and replacement procedure for the BAS control module to correct the unnecessary illumination of the BAS malfunction warning indicator as described above. Please perform this Service Campaign during the vehicle's next scheduled service visit.

VEHICLES AFFECTED

INSPECTION PROCEDURE

1. Connect the Hand-Held Tester (HHT) to the vehicle.
2. Select: Chassis & Drivetrain/BAS/Control Module Version.
3. Compare the existing BAS control module part number (appears as MB number in the control module version HHT display) to the applicable model BAS control module part number in the following parts information table.
   NOTE: The 05 suffix of the BAS control module part number is not present on the BAS control module or the HHT display.
4. If the existing BAS control module part number does not match the part number for the applicable model in the parts information table, proceed to the replacement procedure below.

REPLACEMENT PROCEDURE

1. With the ignition in the OFF position, replace the BAS control module in accordance with the applicable model in the parts information table below. (Refer to WIS: AR42.31-P-6001A for instructions on removing and installing the BAS control module.)
2. Connect the HHT.
3. Read out and erase the Electronic Traction System (ETS) DTC memory.
4. Read out and erase the BAS DTC memory.
   NOTE: Disregard BAS DTC C1025.
5. Disconnect the HHT.
6. Start the engine and make sure no malfunction warning indicator lamps are illuminated.

PARTS INFORMATION

WARRANTY INFORMATION

Operation: 

1. Inspect BAS control module (Includes HHT procedure) (02-3140) or
2. Replace BAS control module (Includes HHT procedure) (02-3141)