LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1574 (Mirror System) >> Diagnostic Information and Procedures >> Power Mirrors Inoperative (With AN3, DL3) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Mirror Motor Circuit Test

  1. Ignition OFF, disconnect the X3 harness connector at the appropriate door module.
  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 20-200 Ω 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.
  5. Test for 20-200 Ω 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.
  6. If all circuits test normal, replace the door module.

Mirror Position Sensor Circuit Test

  1. Ignition OFF, disconnect the X7 harness connector at the appropriate door module.
  2. 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.
  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 Ω 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.
  5. Test for 1k-7k Ω 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.
  6. Test for 1k-7k Ω 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.
  7. If all circuits test normal, replace the door module.
scientia non olet · About LEMON Manuals