Cellular Phone - Interference During Seat Movement

90mercedes02
TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS

DATE: June 1990
REF.NO. 82/54
SUBJECT: POWER SEAT ADJUSTMENT PROXIMITY SWITCHES MODEL 129 WITH AFTERMARKET CELLULAR PHONE INSTALLATION


When operating the power seat switch while telephoning, or with the telephone system on, the power seat adjustment may malfunction. High-frequency signals generated by the telephone system may be interfering with the normal function of the seat proximity switches.

The proximity switches are located behind the left and right B-pillar panels.

To prevent this fram occurring, modified proximity switches should be installed when installing a cellular telephone. These switches are installed in vehicles within the Effective Serial Number Range below and may be installed in vehicles prior to production phase-in.


Effective Serial Number Range


Model Chassis End Number
From To


129 006425 006553
007204 All


Parts Information


Part Name Part Number


Left proximity switch 129 821 01 51
Right proximity switch 129 821 02 51
In Case of Warranty:

Time Allowance

91-2172 Proximity switch - Both seats, Repl. 0.4 hr. | 90

Included Text: Baggage shelf, R & R Trim Paneling-Rear compartment, R & R Check for proper function

Does Not Include:
Hardtop, R & R


Damge Code

91489 73 Proximity switch, electrical fault