500SL (129.067) V8-5.0L (119.960) (1990)
Power Seat Motor Position Sensor: Technical Service Bulletins
Cellular Phone - Interference During Seat Movement
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