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Home >> GMC >> 2021 >> Terrain SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 94 (Driver Assistance Systems) >> Diagnostic Information And Procedures >> Adaptive Cruise Control Malfunction >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2020 GMC Terrain and 2020 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  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 8.5k - 9.0k 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 5.0k - 5.5k 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
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