Driver/Vehicle Information Display

Fault symptom
The Saab Information Display (SID) unit lights up at full strength.

Diagnostic procedure
1 Check the operation of the rheostat by switching on the parking lights and turning the rheostat thumbwheel. If it is in proper working order, the lighting in switches and controls should change with the setting of the rheostat. If it does not, the rheostat is faulty and must be changed.
2 If the rheostat is in proper working order there could be an open circuit in the wiring between the rheostat and the SID unit. Connect a BOB to the 22-pin SID unit connector.
3 Switch on the parking lights and turn the rheostat to maximum. Take a meter reading to see whether 12 V is present across pin 22 of the BOB and a good grounding point.
4 If the voltage reading is not correct, check the wiring for continuity and/or a short circuit.