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Home >> Chevrolet >> 2021 >> Traverse LS, FWD >> Repair and Diagnosis >> Body & Frame >> Mirrors >> Diagnostic Information and Procedures >> Heated Mirrors Malfunction >> Circuit/System Testing

Circuit/System Testing

Single Outside Mirror Defogger Inoperative

  1. Ignition OFF and all vehicle systems OFF, disconnect the appropriate X510 or X610 inline harness connector at the 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 ground circuit terminal 11 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Engine running, connect a test lamp between the control circuit terminal 8 and the ground circuit terminal 5.
  4. Verify the test lamp turns ON when commanding the Rear Defogger On with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, remove the test lamp, disconnect the X1 harness connector at the X53A Fuse Block - Rear Body.
    2. Test for less than 2 Ω in the 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 E17 Outside Rearview Mirror Glass.
    • Go to next step: If the test lamp turns ON 
  5. Test or replace the E17 Outside Rearview Mirror Glass.

Both Outside Mirrors Defogger Malfunction

  1. Ignition OFF, disconnect the X510 inline harness connector at the A9A Outside Rearview Mirror-Driver and the X610 inline harness connector at the A9B Oustide Rearview Mirror-Passenger.
  2. Connect a test lamp between the control circuit terminal 8 and ground, Engine running.
  3. Verify the test lamp does not turn ON and OFF pressing the rear window defogger switch.
    • If the test lamp turns ON and OFF 

      Test or replace the E17D Outside Rearview Mirror Glass - Driver and E17P Outside Rearview Mirror Glass - Passenger.

    • Go to next step: If the test lamp does not turn ON and OFF 
  4. Ignition OFF, connect the X510 and X610 inline harness connector at the A9A Outside Rearview Mirror-Driver and the A9B Oustide Rearview Mirror-Passenger. Disconnect the X1 harness connector at the X53A Fuse Block-Rear Body, Ignition ON.
  5. Verify the E17D Outside Rearview Mirror Glass - Driver and E17P Outside Rearview Mirror Glass - Passenger are not activated.
    • If the E17D Outside Rearview Mirror Glass - Driver and E17P Outside Rearview Mirror Glass - Passenger are activated 
    1. Ignition OFF, disconnect the inline harness connector at the A9 Outside Rearview Mirror, Ignition On/Vehicle in Service Mode.
    2. Test for less than 1 V between the X53A Fuse Block-Rear Body control circuit terminal 31 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, test or replace the E17D Outside Rearview Mirror Glass - Driver and E17P Outside Rearview Mirror Glass - Passenger.
    • Go to next step: If the E17D Outside Rearview Mirror Glass - Driver and E17P Outside Rearview Mirror Glass - Passenger are not activated 
  6. Connect a 10 A fused jumper wire between the control circuit terminal 31 and B+.
  7. Verify the E17D Outside Rearview Mirror Glass - Driver and E17P Outside Rearview Mirror Glass - Passenger activates.
    • If the E17D Outside Rearview Mirror Glass - Driver and E17P Outside Rearview Mirror Glass - Passenger do not activate 
    1. Ignition OFF, remove the jumper wire, disconnect the inline harness connector at the A9 Outside Rearview Mirror.
    2. Test for infinite resistance between the X53A Fuse Block-Rear Body control circuit terminal 31 and ground.
      • If less than Infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the E17D Outside Rearview Mirror Glass - Driver and E17P Outside Rearview Mirror Glass - Passenger
    • Go to next step: If the E17D Outside Rearview Mirror Glass - Driver and E17P Outside Rearview Mirror Glass - Passenger activates 
  8. Ignition OFF and all vehicle systems OFF, connect the X1 harness connector and disconnect the X2 harness connector at the X53A Fuse Block-Rear Body, it may take up to 2 minutes for all vehicle systems to power down.
  9. Test for less than 10 Ω between the ground circuit terminal 34 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  10. Connect the X2 harness connector at the X53A Fuse Block-Rear Body. Disconnect the X2 harness connector at the K33 HVAC Control Module, Ignition ON.
  11. Verify the E17D Outside Rearview Mirror Glass - Driver and E17P Outside Rearview Mirror Glass - Passenger are not activated.
    • If the E17D Outside Rearview Mirror Glass - Driver and E17P Outside Rearview Mirror Glass - Passenger are activated 
    1. Ignition OFF, disconnect the X1 harness connector at the X53A Fuse Block-Rear Body. Ignition ON
    2. Test for less than 1 V between the K33 HVAC Control Module control circuit terminal 19 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the X50A Fuse Block-Underhood.
    • Go to next step: If the E17D Outside Rearview Mirror Glass - Driver and E17P Outside Rearview Mirror Glass - Passenger are not activated 
  12. Connect a 3 A fused jumper wire between the control circuit terminal 19 and B+.
  13. Verify the E17D Outside Rearview Mirror Glass - Driver and E17P Outside Rearview Mirror Glass - Passenger activates.
    • If the E17D Outside Rearview Mirror Glass - Driver and E17P Outside Rearview Mirror Glass - Passenger do not activate 
    1. Ignition OFF, remove the jumper wire, disconnect the X1 harness connector at the X53A Fuse Block-Rear Body, Ignition ON.
    2. Test for infinite resistance between the K33 HVAC Control Module control circuit terminal 19 and ground.
      • If less than Infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the 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 X53A Fuse Block-Rear Body.
    • Go to next step: If the E17D Outside Rearview Mirror Glass - Driver and E17P Outside Rearview Mirror Glass - Passenger activates 
  14. All OK.
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