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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1111 (Mirror Systems) >> Diagnostic Information and Procedures >> DTC B1544, B1600, or B1605 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the inline harness connector at the outside rearview mirror.
  2. Install a test lamp between the control circuit terminal 2 and the control circuit terminal 6.
  3. Ignition ON, commanded the mirror left and right using the mirror directional switch. The test lamp should turn ON and OFF as the mirror commanded to the left and right.
    • If the test lamp does not turn ON and OFF when cycling between the commanded states, test both control circuit for a short to voltage, a short to ground, or an open/high resistance. If the circuits test normal, replace the applicable door switch.
  4. Ignition OFF, install a test lamp between the control circuit terminal 1 and the control circuit terminal 6.
  5. Ignition ON, commanded the mirror up and down using the mirror directional switch. The test lamp should turn ON and OFF as the mirror commanded up and down.
    • If the test lamp does not turn ON and OFF when cycling between the commanded states, test both control circuit for a short to voltage, a short to ground, or an open/high resistance. If the circuits test normal, replace the applicable door module.
  6. If all circuits test normal, test or replace the outside rearview mirror motor.
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