Interior Backlighting Does Not Dim
WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
Interior Backlighting Does Not Dim
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Interior Lights Dimming Schematics Connector End View Reference: Master Electrical Component List in Wiring Systems |
|||
| 1 | Did you perform the Lighting Systems Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Lighting Systems |
| 2 | Verify that the interior backlighting does not dim. Does the interior backlighting operate normally? |
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 | Do the I/P lamps dim? | Go to Step 13 | Go to Step 4 |
| 4 | Do the class 2 lamps dim? | Go to Step 5 | Go to Step 6 |
| 5 | Test for a short to battery positive voltage in the instrument panel lamps supply voltage circuit. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 14 | Go to Step 13 |
| 6 | Disconnect the I/P dimming switch. Does all the illumination of the backlight components turn OFF? |
Go to Step 8 | Go to Step 7 |
| 7 | Test for a short to voltage on the I/P dimming control circuit. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 14 | Go to Step 8 |
| 8 | Test for a poor connection, open or a short to ground in the I/P dimming control circuit. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 14 | Go to Step 9 |
| 9 | Test for a poor connection or an open in the I/P dimming return circuit. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 14 | Go to Step 10 |
| 10 |
|
Go to Step 13 | Go to Step 11 |
| 11 | Test for an open or a short to battery positive voltage in the I/P dimming voltage reference circuit. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 14 | Go to Step 12 |
| 12 | Replace the I/P dimming switch. Refer to Instrument Panel (I/P) Dimmer Switch Replacement . Did you complete the replacement? |
Go to Step 14 | - |
| 13 |
IMPORTANT:
Perform the setup procedures for the body control module (BCM). Refer to Body Control Module (BCM) Programming/RPO Configuration
in Body Control System. Replace the body control module (BCM). Refer to Body Control Module Replacement
in Body Control System.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 |