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Circuit/System Testing

NOTE:

Perform the Circuit/System Verification before proceeding with Circuit/System Testing.

Frontview Camera - Windshield Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B174W Frontview Camera - Windshield. 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 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 
  3. 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 B174W Frontview Camera - Windshield.
    • If the test lamp illuminates 
  4. Replace the B174W Frontview Camera - Windshield.

Forward Collision Alert Indicator Malfunction

  1. Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at the P43 Collision Alert Indicators. 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 4 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. Verify a test lamp illuminates between the ignition circuit terminal 1 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 ignition 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 ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the P43 Collision Alert Indicators.
    • If the test lamp illuminates 
  5. Connect a test lamp between the control circuit terminal 2 and the ignition circuit terminal 1.
  6. Verify the test lamp turns ON and OFF when commanding the Instrument Cluster All Indicators ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster, ignition ON.
    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, 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.

Forward Collision Alert Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left, ignition ON.
  2. Test for at least 9.7 V between the ignition circuit terminal 12 and ground.
    • If less than 9.7 V 
    1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the 12 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 12 V reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify there is voltage at the fuse and the fuse is good.
    • If 9.7 V or greater 
  3. Ignition OFF, connect the harness connector at the S70L Steering Wheel Controls Switch - Left, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON.
  4. Test for less than 1 V between the signal circuit terminals listed below and ground:
    • Terminal 4
    • Terminal 16
    • If 1 V or greater 

      Repair the short to voltage on the signal circuit.

    • If less than 1 V 
  5. Ignition OFF.
  6. Test for infinite resistance between the signal circuit terminals listed below and ground:
    • Terminal 4
    • Terminal 16
    • If less than infinite resistance 

      Repair the short to ground on the signal circuit.

    • If infinite resistance 
  7. Disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.
  8. Test for less than 5 Ω between the circuit terminals listed below:
    • S70L Steering Wheel Controls Switch - Left terminal 12 and K9 Body Control Module terminal 4.
    • S70L Steering Wheel Controls Switch - Left terminal 10 and K9 Body Control Module terminal 16.
    • If greater than 5 Ω 

      Repair the open/high resistance in the circuit.

    • If less than 5 Ω 
  9. Test or replace the S70L Steering Wheel Controls Switch - Left.
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