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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1005 (Mirror Systems) >> Diagnostic Information and Procedures >> Power Mirrors Inoperative >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Mirror Motor Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector X3 at the appropriate door switch.
  2. 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.
  3. 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.
  4. Test for 40-100 ohms of resistance 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 motor.
  5. Test for 40-100 ohms of resistance between the control circuit terminal 2 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 motor.
  6. If all circuits test normal, replace the appropriate door switch.

Mirror Position Sensor Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector X7 at the appropriate door switch.
  2. Ignition ON, verify a test lamp does not illuminate between the following circuit terminals and ground:
    • 5-volt 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.
  3. Ignition OFF, test for infinite resistance between the following circuits and ground:
    • 5-volt 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.
  4. Test for 4K-7K ohms of resistance between the 5-volt reference circuit terminal 7 and the low reference circuit terminal 10.
    • If not within the specified range, test the 5-volt reference circuit and the low reference circuit for an open/high resistance. If the circuits test normal, test or replace the rearview mirror motor.
  5. Test for 1K-7K ohms of resistance between the 5-volt 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 motor.
  6. Test for 1K-7K ohms of resistance between the 5-volt 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 motor.
  7. If all circuits test normal, replace the appropriate door switch.
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