General Information

Interior Lighting

Purpose of the System




The GM controls the interior lighting automatically with the status change of several monitored inputs.

The lighting can also be manually controlled using the interior light switch (2).

In addition to the various time controls, the interior lights are also subject to the 16 minute shut down of the GM (consumer protection).

Principle of Operation
The interior light switch is a rocker switch that will activate the interior lights "On or Off (left/right positions). When the light switch is in the center position (automatic):
- If the interior lights are switched "ON" by the button with the ignition switched ON, the interior lights will remain on until they are switched off by the button.
- If the interior lights are switched "ON" when the ignition is switched OFF, the lights will remain on for 16 minutes (consumer cutout).
- Locking the vehicle from the outside will immediately switch off the interior lights.

The ON/OFF conditions for the interior lights in the automatic mode are as follows:

ON Conditions
- Door Open.
- Switching off ignition after exterior lights have been switched off.
- Crash Alarm/MRS input.

OFF Conditions
- All doors closed with ignition on.
- All doors closed with ignition off after 20 seconds.
- 20 seconds after switching off ignition with lights off.
- 8 seconds after switching the ignition off.
- 16 minutes with door(s) open.
- When doors are locked.

System Components: Inputs - Processing - Outputs









- The GM in 3 Series convertibles provide power to the manual circuit of the interior lights (See the Consumer Cutout feature).
- Through the production range there are minor changes in the lighting fixtures.
For example: the additional map light switch on rear seat interior lights on 1997 models. Always refer to the specific Electrical Diagrams for the vehicle being serviced.