FixVault
Home › GMC › 2021 › Terrain SL › Repair and Diagnosis › Accessories & Equipment › Drivers Assistance Systems - ADAS › Driver Assistance Systems › Diagnostic Information and Procedures › Adaptive Cruise Control Malfunction › Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the S70L Steering Wheels Controls Switch - Left, ignition ON.
  2. Test for 11.8 - 12.2 V between the 12 V reference circuit terminal 12 and ground.
    • If less than 11.8 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.
      • Go to next step: 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, replace the K9 Body Control Module.
    • If greater than 12.2 V 
    1. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the 12 reference circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K9 Body Control Module.
    • Go to next step: If the test lamp illuminates 
  3. Ignition OFF, connect the harness connector at the S70L Steering Wheels 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 terminal 16 and ground.
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  5. Ignition OFF.
  6. Test for infinite resistance between the signal circuit terminal 16 and ground.
    • If less than infinite resistance 
    • Go to next step: Repair the short to ground on the circuit. 
  7. Test for 8500 - 9000 Ω between the 12 V reference circuit terminal 4 and the signal circuit terminal 16.
    • If not within the specified range 
    1. Ignition OFF, disconnect the harness connector at the S70L Steering Wheels Controls Switch - Left.
    2. 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 S70L Steering Wheels Controls Switch - Left.
    • Go to next step: If within the specified range 
  8. Press and hold the adaptive cruise control gap switch. Test for 5000 - 5500 Ω between the 12 V reference circuit terminal 4 and the signal circuit terminal 16.
    • If not within the specified range 

      Replace the S70L Steering Wheels Controls Switch - Left.

    • Go to next step: If within the specified range 
  9. Test or replace the K9 Body Control Module
About FixVault