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Home >> Chevrolet >> 2010 >> Traverse LT, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 487 (Mirror System) >> Diagnostic Information and Procedures >> Power Mirror Malfunction (With DNP or DNT) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.

Outside Mirror Movement Malfunction

  1. Ignition OFF, disconnect the X2 harness connector at the appropriate A9 Outside Rearview Mirror. Ignition ON
  2. Connect a test lamp between the control circuit terminal 1 and control circuit terminal 6.
  3. Verify the test lamp turns ON when commanding the Up and Down states with a scan tool.
    • If the test lamp remains OFF during either of the commands 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the Door Lock/Window Switch.
    2. Test for infinite resistance between each control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in each control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the Door Lock/Window Switch.
    • If the test lamp is always ON 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the Door Lock/Window Switch, ignition ON.
    2. Test for less than 1 V between each control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the Door Lock/Window Switch
    • If the test lamp turns ON during each of the commands 
  4. Connect a test lamp between the control circuit terminal 2 and control circuit terminal 6.
  5. Verify the test lamp turns ON when commanding the Left and Right states with a scan tool.
    • If the test lamp remains OFF during either of the commands 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the Door Lock/Window Switch.
    2. Test for infinite resistance between each control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in each control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the Door Lock/Window Switch.
    • If the test lamp is always ON 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the Door Lock/Window Switch, ignition ON.
    2. Test for less than 1 V between each control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the Door Lock/Window Switch
    • If the test lamp turns ON during each of the commands 
  6. Test or replace the M77 Outside Rearview Mirror Motor.

Mirror Position Sensor Circuit Test

  1. Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the appropriate A9 Outside Rearview Mirror. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 10 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the Door Lock/Window Switch.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the Door Lock/Window Switch.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 7 and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the harness connector at the Door Lock/Window Switch.
    2. Test for infinite resistance between the 5 V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the 5 V reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the Door Lock/Window Switch.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the harness connector at the Door Lock/Window Switch, ignition ON.
    2. Test for less than 1 V between the 5 V reference circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the Door Lock/Window Switch.
    • If between 4.8-5.2 V 
  5. Verify the scan tool Mirror Vertical Position parameter is less than 4.6 V.
    • If 4.6 V or greater 
    1. Ignition OFF, disconnect the harness connector at the Door Lock/Window Switch, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal 4 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the Door Lock/Window Switch.
    • If less than 4.6 V 
  6. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 7.
  7. Verify the scan tool Mirror Vertical Position or the parameter is greater than 0.6 V.
    • If 0.6 V or less 
    1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the Door Lock/Window Switch.
    2. Test for infinite resistance between the signal circuit terminal 4 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the Door Lock/Window Switch.
    • If greater than 0.6 V 
  8. Verify the scan tool Mirror Horizontal Position parameter is less than 4.6 V.
    • If 4.6 V or greater 
    1. Ignition OFF, disconnect the harness connector at the Door Lock/Window Switch, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal 5 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the Door Lock/Window Switch.
    • If less than 4.6 V 
  9. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the 5 V reference circuit terminal 7.
  10. Verify the scan tool Mirror Horizontal Position or the parameter is greater than 0.6 V.
    • If 0.6 V or less 
    1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the Door Lock/Window Switch.
    2. Test for infinite resistance between the signal circuit terminal 5 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the Door Lock/Window Switch.
    • If greater than 0.6 V 
  11. Test or replace the M77 Outside Rearview Mirror Motor.
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