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Home >> Chevrolet >> 2010 >> Traverse LT, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 488 (Lighting System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Rear Fog Lamps Malfunction >> Circuit/System Testing

Circuit/System Testing

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Rear Fog Lamp Switch Malfunction

  1. Ignition OFF, all doors closed, all accessories OFF, disconnect the harness connector at the S30 Headlamp Switch. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 15 Ω between the ground circuit terminal 8 and ground.
    • If 15 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.
    • If less than 15 Ω 
  3. Ignition ON.
  4. Verify the scan tool Rear Fog Lamp Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit terminal 10 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • If Inactive 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 10 and the ground circuit terminal 8.
  6. Verify the scan tool Rear Fog Lamp Switch parameter is Active.
    • If not Active 
    1. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal 10 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    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 K9 Body Control Module.
    • If Active 
  7. Test or replace the S30 Headlamp Switch.

Rear Fog Lamps Malfunction

  1. Ignition OFF, disconnect the KR57 Rear Fog Lamp Relay, ignition ON
  2. Verify a test lamp illuminates between the B+ circuit terminal 85 and ground.
    • If the test lamp does not illuminate 

      Replace the X51A Fuse Block - Instrument Panel.

    • If the test lamp illuminates 
  3. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground.
    • If the test lamp does not illuminate 

      Replace the X51A Fuse Block - Instrument Panel.

    • If the test lamp illuminates 
  4. Connect a test lamp between the control circuit terminal 86 and B+, ignition ON.
  5. Verify the test lamp turns ON and OFF when commanding the appropriate Rear Fog Lamps ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the control circuit terminal and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Ignition OFF.
    4. 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 K9 Body Control Module.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the X4 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the control circuit terminal and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • If the test lamp turns ON and OFF 
  6. Ignition OFF, exterior lamps OFF, connect the KR57 Rear Fog Lamp Relay.
  7. Disconnect the appropriate harness connector at the S30 Headlamp Switch and E29R Fog Lamp - Rear.
  8. Test for less than 15 Ω between the appropriate ground circuit terminal listed below and ground.
    • S30 Headlamp Switch terminal 8
    • E29R Fog Lamp - Rear terminal 2
    • If 15 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.
    • If less than 15 Ω 
  9. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.
    • S30 Headlamp Switch terminal 11
    • E29R Fog Lamp - Rear terminal 1
  10. Verify the test lamp turns ON and OFF when commanding the appropriate Rear Fog Lamps ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X1 harness connector at the X51A Fuse Block - Instrument Panel.
    2. Test for infinite resistance between the 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 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 KR57 Rear Fog Lamp Relay.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the X1 harness connector at the X51A Fuse Block - Instrument Panel, ignition ON.
    2. Test for less than 1 V between the control circuit terminal and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the KR57 Rear Fog Lamp Relay.
    • If the test lamp turns ON and OFF 
  11. Test or replace the appropriate rear fog lamp bulb.
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