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Home >> GMC >> 2017 >> Terrain SL, Gas >> Repair and Diagnosis >> Accessories & Equipment >> Collision/Avoidance >> Object Detection System And Pedestrian Protection System >> Diagnostic Information and Procedures >> Forward Collision Alert System Malfunction >> Circuit/System Testing
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Circuit/System Testing

NOTE:

You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

Frontview Camera Module Malfunction

  1. Ignition ON.
  2. Verify no DTCs are set.
    • If no DTCs are set 
  3. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Disconnect the harness connector at the K109 Frontview Camera Module.
  4. Test for less than 10 Ω between the ground circuit terminal 1 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.
    • If less than 10 Ω 
  5. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K109 Frontview Camera Module.
    • If the test lamp illuminates 
  6. Ignition ON.
  7. Test for less than 1 V between the signal circuit terminal 10 and ground.
    • If 1 V or greater 
    1. Disconnect the harness connector at S70L Steering Wheel Controls Switch - Left.
    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 signal circuit.
    • If less than 1 V 
  8. Ignition OFF.
  9. Test for infinite resistance between the signal circuit terminal 10 and ground with the forward collision alert switch not pressed.
    • If less than infinite resistance 
    1. Disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance test or replace the S70L Steering Wheel Controls Switch - Left.
    • If infinite resistance 
  10. Test for 1.2k - 1.4k Ω between the signal circuit terminal 10 and ground with the forward collision alert switch pressed.
    • If not between 1.2k - 1.4k Ω 
    1. Disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left
    2. Test for less than 2 Ω in the signal circuit from end to end.
      • If greater than 2 Ω 

        Repair the open/high resistance in the circuit.

      • If 2 Ω or less 
    • If between 1.2k - 1.4k Ω 
  11. Connect the harness connector of the S70L Steering Wheel Controls Switch - Left and K109 Frontview Camera Module.
  12. Verify the scan tool Forward Collision Alert Function Status parameter is Off, Disabled, Not Ready To Assist or Ready To Assist.
    • If parameter is Malfunction 

      Replace K109 Frontview Camera Module.

    • If parameter is not Malfunction 
  13. All OK.

Forward Collision Alert Switch Malfunction

  1. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.
  2. Test for less than 5 Ω between the ground circuit terminal 7 and ground.
    • If 5 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 5 Ω 
  3. Ignition ON.
  4. Verify the scan tool Lane Departure Warning Switch Status parameter is Open.
    • If not Open 
    1. Ignition OFF, disconnect the harness connector at the K109 Vehicle Camera Module.
    2. Test for infinite resistance between the signal circuit terminal 2 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K109 Vehicle Camera Module.
      • If Open 
  5. Connect the harness connector at the S70L Steering Wheel Controls Switch - Left, ignition ON.
  6. Verify the driver information center displays and adjusts forward collision alert setting while repeatedly pressing and releasing the forward collision switch. The setting should cycle between far, medium, near, and off.
    • If the display does not change 

      Test or replace the S70L Steering Wheel Controls Switch - Left.

    • If the display changes 
  7. All OK.

Forward Collision Alert Indicators Malfunction

  1. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Disconnect the harness connector at the P43 Collision Alert Indicators.
  2. Test for less than 10 Ω between the ground circuit terminal 2 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.
    • If less than 10 Ω 
  3. Ignition ON.
    4. NOTE:

    Verify interior lighting dimming is turned all the way up.

  4. Test for 6.2 - 12.0 V between the control circuit terminal 1 and ground.
    • If less than 6.2 V 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    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 greater than 12.0 V 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
    • If between 6.2 - 12.0 V 
  5. Connect a test lamp between the appropriate control circuit terminal and B+.
    • Terminal 6, Green Lane Departure Warning Indicator
    • Terminal 7, Amber Lane Departure Warning Indicator
    • Terminal 4, Green Vehicle Ahead Indicator
    • Terminal 5, Red Collision Alert Indicator
  6. Verify the test lamp turns ON and OFF when commanding the Instrument Cluster All Indicators control function ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, remove the test lamp and disconnect the harness connector at the P16 Instrument Cluster.
    2. Test for less than 1 V between the control circuit 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 P16 Instrument Cluster.
    • If the test lamp is always ON 
    1. Ignition OFF, remove the test lamp and disconnect the harness connector at the P16 Instrument Cluster.
    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, replace the P16 Instrument Cluster.
    • If the test lamp turns ON and OFF 
  7. Test or replace the P43 Collision Alert Indicators.
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