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Interior Backlighting Inoperative

WARNING: This page is about a different car, the 2007 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
Interior Backlighting Inoperative

Step Action Yes No
Schematic Reference: Interior Lights Dimming Schematics
Connector End View Reference: Master Electrical Component List
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 Do the park lamps operate properly? Go to Step 3  Go to Park Lamps Inoperative 
3 Are all of the interior backlighting lamps inoperative? Go to Step 8  Go to Step 4 
4
  1. Turn OFF the ignition.
  2. Disconnect the component with the inoperative backlight lamp.
  3. Connect a test lamp between the backlight lamp control circuit of the component with the inoperative backlight lamp and the ground circuit of the component with the inoperative backlight lamp.
  4. Turn ON the ignition, with the engine OFF.
  5. Cover the sunload sensor.
  6. Place the headlamp switch in the PARK position.
  7. Operate the instrument panel (I/P) dimmer switch from minimum to maximum.
Does the test lamp illuminate?		 Go to Step 9  Go to Step 5 
5 Test the backlight lamps control circuit of the inoperative backlight lamp for the following:
  • An open
  • A high resistance
  • A short to ground

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 13  Go to Step 6 
6 Test the ground circuit of the inoperative backlight lamp for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 13  Go to Step 7 
7 Inspect for poor connections at the harness connector of the appropriate control module for the inoperative backlight lamp. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 13  Go to Step 12 
8 Inspect for poor connections at the harness connector of the instrument panel module (IPM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 13  Go to Step 11 
9 Inspect for poor connections at the harness connector of the component with inoperative backlight lamp. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 13  Go to Step 10 
10
  1. Replace the inoperative backlight bulbs in the component if they are replaceable. See the appropriate systems operation and description.
  2. If the bulb is not replaceable replace the component with the inoperative backlight lamps.
Did you complete the replacement?		 Go to Step 13  -
11 Replace the IPM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 13  -
12 Replace the appropriate control module for the inoperative backlight lamp. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming.
Did you complete the replacement?		 Go to Step 13  -
13 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 2 
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