Unnecessary Replacement Of SRS Control Unit (91/23)

UNNECESSARY REPLACEMENT OF SRS CONTROL UNIT

TECHNICAL SERVICE BULLETIN

UNNECESSARY REPLACEMENT OF SRS CONTROL UNIT (N2/2)

Model(s): 1985 Mercedes-Benz 500 SEC, 500 SEL; 1986-1987 Mercedes-Benz 300 SDL; 1986-1989 Mercedes-Benz 190 D, 560 SL; 1986-1991 Mercedes-Benz 420 SEL, 560 SEC, 560 SEL; 1986-1993 Mercedes-Benz 190 E, 300 E; 1987 Mercedes-Benz 300 D, 300 TD; 1987-1989 Mercedes-Benz 260 E; 1988-1991 Mercedes-Benz 300 SEL; 1988-1993 Mercedes-Benz 300 CE, 300 SE, 300 TE; 1990-1991 Mercedes-Benz 350 SDL; 1991 Mercedes-Benz 350 SD; 1990-1993 Mercedes-Benz 300 D, 300 E 4MATIC, 300 TE 4MATIC, 300 SL, 500 SL; 1992 Mercedes-Benz 400 SE; 1992-1993 Mercedes-Benz 300 SD, 400 E, 500 E, 500 SEL, 600 SEL; 1993 Mercedes-Benz 400 SEL, 500 SEC, 600 SEC, 600 SL

Group: 91 - Seats, Supplemental Restraint System (SRS)

Bulletin No.: MBNA 91/23

Date: January 1992

SERVICE INFORMATION

It has come to our attention that SRS Control Units (N2/2) are being replaced unnecessarily. Please be aware that selected SRS control units that are returned under warranty are being tested at MBAG.

In a number of cases the complaint could not be verified, and in others the control units had more than one fault code stored in memory.

Also, some of the returned control units had fault code 3 stored in memory. Fault code 3 refers to the Driver airbag electrical circuit. The diagnostic procedure does not call for replacing the control unit in this circumstance.

In all cases, after the fault code was erased, no failure could be found in the returned control units.

Please be reminded that the diagnostic procedures outlined in the Diagnostic Manual(s) must be followed thoroughly. If the complaint is of an intermittent nature, a supporting explanation must be entered in the text field of the warranty claim. This information will assist in testing of the returned parts.

Returned SRS control units with no fault found may be returned to the dealer and the dealership account debited.