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Circuit/System Testing

WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

Mirror Motor Circuit Test

  1. Ignition OFF, disconnect the X1 harness connector at the outside rearview mirror.
  2. Connect a test lamp between the control circuit terminal 11 and the control circuit terminal 10.
  3. Ignition ON, command the mirror LEFT and RIGHT with a scan tool. The test lamp should turn ON when commanding the LEFT and RIGHT states.
    • If the test lamp remains OFF during either of the commands, test for a short to ground or an open/high resistance on either control circuits. If the circuits test normal, replace the door module.
  4. Connect a test lamp between the control circuit terminal 9 and the control circuit terminal 10.
  5. Ignition ON, command the mirror UP and DOWN with a scan tool. The test lamp should turn ON when commanding the UP and DOWN states.
    • If the test lamp remains OFF during either of the commands, test for a short to ground or an open/high resistance on either control circuits. If the circuits test normal, replace the door module.
  6. If all circuits test normal, test or replace the outside rearview mirror motor.

Mirror Position Sensor Circuit Test

  1. Ignition OFF, disconnect the X2 harness connector at the appropriate outside rearview mirror.
  2. Wait 1 minute, test for less than 1.0 ohm between the low reference circuit terminal 7 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the appropriate door module.
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 3 and ground.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the appropriate door module.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the door module.
  4. Install a 3A fused jumper wire between the signal circuit terminal 5 and the 5-volt reference circuit terminal 3. Verify the scan tool Mirror Vertical Position parameter is greater than 4.8 volts.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the door module.
  5. Install a 3A fused jumper wire between the signal circuit terminal 6 and the 5-volt reference circuit terminal 3. Verify the scan tool Mirror Horizontal Position parameter is greater than 4.8 volts.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the door module.
  6. Install a 3A fused jumper wire between the signal circuit terminal 5 and the low reference circuit terminal 7. Verify the scan tool Mirror Vertical Position parameter is less than 0.2 volt.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the door module.
  7. Install a 3A fused jumper wire between the signal circuit terminal 6 and the low reference circuit terminal 7. Verify the scan tool Mirror Horizontal Position parameter is less than 0.2 volt.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the door module.
  8. If all circuits test normal, test or replace the outside rearview mirror motor.
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