Convertible Control Module - Inoperative/DTCs

TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS

DATE: July 1993

REF.NO. MBNA 77/9

SUBJECT:
Models 124.066, 129
Power Soft Top Control Modules

Increasingly, power soft top control modules are being returned under warranty which while not defective, have various codes stored in the DTC memory. Among the codes present are those which suspend soft top operation:

Diagnostic Trouble Codes (DTC's) which suspend soft top operation

Model DTC

124.066 3, 18, 20-24
129 21, 22, 26, 30

Control modules returned with these codes will not be accepted under warranty.

The following procedure should always be carried out:

1. Recall DTC memory.

2. Erase DTC memory.

3. Drive vehicle for more than 10 seconds.

4. Open and close soft top.

5. Recall DTC memory again.

Should a problem occur during soft top operation, hold the switch until the indicator lamp in the switch begins blinking. If the previously listed DTC's can be erased, soft top operation is once again possible. In other words, the fault is no longer present. The exception to this is DTC 30, which may be stored again while driving.