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 MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 531 (MIRROR SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESPOWER MIRROR MALFUNCTIONCIRCUIT/SYSTEM TESTING
2009 Chevrolet Tahoe Base, 4.8 C
Circuit/System Testing
2009 Chevrolet Tahoe Base, 4.8 CSECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Mirror Motor Circuit Test
- Ignition OFF, disconnect the X3 harness connector at the appropriate door module.
- Ignition ON, verify a test lamp does not illuminate between the following control circuit terminals and ground:
- Control circuit terminal 1
- Control circuit terminal 2
- Control circuit terminal 6
- If the test lamp illuminates, test the appropriate control circuit for a short to voltage.
- Ignition OFF, test for infinite resistance between the following control circuits and ground:
- Control circuit terminal 1
- Control circuit terminal 2
- Control circuit terminal 6
- If less the specified value, test the appropriate control circuit for a short to ground.
- Test for 20-200 Ξ© between the control circuit terminal 1 and the control circuit terminal 6.
- If not within the specified range, test both control circuits for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
- Test for 20-200 Ξ© between the control circuit terminal 2 and the control circuit terminal 6.
- If not within the specified range, test both control circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
- If all circuits test normal, replace the door module.
Mirror Position Sensor Circuit Test
- Ignition OFF, disconnect the X7 harness connector at the appropriate door module.
- Ignition ON, verify a test lamp does not illuminate between the following circuit terminals and ground:
- 5 V reference circuit terminal 7
- Signal circuit terminal 4
- Signal circuit terminal 5
- Low reference circuit terminal 10
- If the test lamp illuminates, test the appropriate circuit for a short to voltage.
- Ignition OFF, test for infinite resistance between the following circuits and ground:
- 5 V reference circuit terminal 7
- Signal circuit terminal 4
- Signal circuit terminal 5
- Low reference circuit terminal 10
- If less than the specified value, test the appropriate circuit for a short to ground.
- Test for 4k-7k Ξ© between the 5 V reference circuit terminal 7 and the low reference circuit terminal 10.
- If not within the specified range, test the 5 V reference circuit and the low reference circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
- Test for 1k-7k Ξ© between the 5 V reference circuit terminal 7 and the signal circuit terminal 4.
- If not within the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
- Test for 1k-7k Ξ© between the 5 V reference circuit terminal 7 and the signal circuit terminal 5.
- If not within the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror.
- If all circuits test normal, replace the door module.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.