Heated Seat Pad - Damage
CATEGORYElectrical
SECTION
3
PAGE
37
ISSUE
01/93-0297
CODE
364
Subject:
Electrically-Heated Seats with Rheostat-Controlled Driver's Seat
Application:
M91-92 900 Models
In cars with seats having velour upholstery the rheostat for the driver's seat heating pad may be damaged due to a discharge of static electricity.
This damage and the build-up of an electrostatic charge may be prevented by connecting the heating pad to ground. The following repair should be performed anytime a rheostat is being replaced.
Cars Affected:
900 Model-Saabs with velour upholstery and electrically-heated front seats with rheostat-controlled driver's seat.
Parts:
Connector Sleeve 71 55 203
Cable Tie 79 71 880
Rheostat (if necessary) 95 18 820
Action:
Refer to the wiring diagram, Figure 1, and connect the heating pad to ground as follows:
1. Locate the 3-pole connector of the seat switch for the heating pad, which is located under the passenger's seat. The seat switch is to be bypassed. (Some cars also have a 3-pole connector for the seat switch which operates the seat-belt warning.)
NOTE
To be sure of locating the right connector, use an ohmmeter or a buzzer to check that an electrical connection exists between pin 5 of the 8-pole connector under the passenger's seat and the 3-pole connector in question. When measuring with an ohmmeter, the 8-pole connector must be unplugged.
NOTE
Once you have bypassed the seat switch, the seat heater will function as if someone is always sitting in the seat. When you turn the key on, the passenger seat heater will power up for less than a minute and then the thermistor will shut it off.
2. Unplug the 3-pole connector and cut off both leads before the connector.
3. Crimp the two ends together, using a connector sleeve (P/N 71 55 203) to bypass the seat switch. Secure the wiring using a cable tie (P/N 79 71 880).
WARRANTY INFORMATION:
For warranty repairs to replace a damaged rheostat (Operation no. 36446, 0.2 hours), add 0.1 hours in straight time for the above modification.