Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBUICK2006TERRAZA CXL, 3.5 L, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 90 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESINTERIOR BACKLIGHTING DOES NOT DIM
2006 Buick Terraza CXL, 3.5 L, AWD
Interior Backlighting Does Not Dim
2006 Buick Terraza CXL, 3.5 L, AWDSECTION Interior Backlighting Does Not Dim
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. 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 |
|||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 | Verify that the interior backlighting does not dim. Does the interior backlighting operate normally? |
Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
| 3 | Do the instrument panel (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 I/P lamps supply voltage circuit. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 14 | Go to Step 13 |
| 6 | Disconnect the lamp switch assembly. Does all the illumination of the backlight components turn OFF? |
Go to Step 8 | Go to Step 7 |
| 7 | Test for a short to battery positive voltage on the I/P dimming control circuit. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 14 | Go to Step 8 |
| 8 | Test for a poor connection, an open or a short to ground in the I/P dimming control circuit. Refer to Circuit Testing
and Wiring Repairs
. 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
. 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
. Did you find and correct the condition? |
Go to Step 14 | Go to Step 12 |
| 12 | Replace the lamp switch assembly. Refer to Headlamp Switch Replacement . Did you complete the replacement? |
Go to Step 14 | - |
| 13 | Replace the BCM. 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 |
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.