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 | |
2 | Are all of the interior backlighting lamps always ON? | Go to Step 3 | Go to Step 8 |
3 |
Does the scan tool indicate that the Dimming Pot A/D parameter is changing when the I/P dimmer switch is moved? | Go to Step 4 | Go to Step 6 |
4 | With a scan tool, observe the Park Lamp Switch status in the IPM inputs data list. Does the scan tool display ON? | Go to Step 5 | Go to Step 7 |
5 | With a scan tool, observe the Ambient Light Status parameter in the lighting data list. Does the scan tool display DARK? | Go to Step 10 | |
6 | Test the I/P dimmer switch low reference circuit for an open, high resistance, or short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 14 | Go to Step 9 |
7 | Test the park lamp relay control circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 14 | Go to Step 10 |
8 | Inspect for poor connections at the harness connector of the appropriate control module of the inoperative backlight lamp. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 14 | Go to Step 11 |
9 | Inspect for poor connections at the harness connector of the I/P dimmer switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 14 | Go to Step 12 |
10 | 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 . Did you find and correct the condition? | Go to Step 14 | Go to Step 13 |
11 | Replace the appropriate control module for the inoperative backlight lamp. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 14 | -- |
12 | Replace the I/P lamps dimmer switch. Refer to Instrument Panel Lamp Dimmer Switch Replacement . Did you complete the replacement? | Go to Step 14 | -- |
13 | Replace the IPM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 14 | -- |
14 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
