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 MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 29 (MIRROR SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESPOWER MIRRORS INOPERATIVETEST DESCRIPTION
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Test Description
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Test Description
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers on the diagnostic table.
- 6: This step tests the integrity of both the mirror control circuits and the power mirror switch. If both power mirrors are inoperative on one or more axis, begin testing by disconnecting one of the power mirrors, if an open circuit is detected and repaired for that power mirror, repeat step 6 for the other power mirror.
- 7: This step tests the integrity of the battery positive voltage circuit, not the fuse.
Power Mirrors Inoperative
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Outside Rearview Mirror Schematics Connector End View Reference: Vehicle Access Connector End Views |
|||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
|
Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
| 3 | Are both the left and right power mirrors completely inoperative? | Go to Step 4 | Go to Step 6 |
| 4 |
|
Go to Step 5 | Go to Step 7 |
| 5 | Connect a test lamp between the battery positive voltage circuit of the power mirror switch harness connector and the ground circuit of the power mirror switch harness connector. Does the test lamp illuminate? |
Go to Step 9 | Go to Step 15 |
| 6 |
|
Go to Step 12 | Go to Step 8 |
| 7 | Repair the battery positive voltage circuit of the power mirror switch for a short to ground or an open. Refer to Circuit Testing
and Wiring Repairs
. Did you complete the repair? |
Go to Step 18 | Go to Step 9 |
| 8 | Test the mirror motor control circuits for an open. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 18 | Go to Step 9 |
| 9 | Probe each of the power mirror motor control circuits of the power mirror switch harness connector with a test lamp that is connected to battery positive voltage. Did the test lamp illuminate at any of the power mirror motor control circuits? |
Go to Step 13 | Go to Step 10 |
| 10 | Probe each of the power mirror motor control circuits of the power mirror switch harness connector with a test lamp that is connected to ground. Did the test lamp illuminate at any of the power mirror motor control circuits? |
Go to Step 14 | Go to Step 11 |
| 11 | Inspect for poor connections at the harness connector of the power mirror switch. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 18 | Go to Step 16 |
| 12 | Inspect for poor connections at the harness connector of the inoperative power mirror. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 18 | Go to Step 17 |
| 13 | Repair the short to ground in the power mirror motor control circuit. Refer to Wiring Repairs
. Did you complete the repair? |
Go to Step 18 | - |
| 14 | Repair the short to battery positive voltage in the power mirror motor control circuit. Refer to Wiring Repairs
. Did you complete the repair? |
Go to Step 18 | - |
| 15 | Repair the open in the power mirror switch ground circuit. Refer to Wiring Repairs
. Did you complete the repair? |
Go to Step 18 | - |
| 16 | Replace the power mirror switch. Did you complete the replacement? |
Go to Step 18 | - |
| 17 | Replace the power mirror motor. Refer to Motor Replacement - Power Mirror . Did you complete the replacement? |
Go to Step 18 | - |
| 18 | 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.