LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> GMC >> 2018 >> Acadia SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 344 (Cruise Control System) >> Diagnostic Information and Procedures >> Cruise Control Malfunction >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.

Cruise Control Set/Coast/Resume/Accelerate Switch Signal

  1. Ignition/Vehicle & All vehicle systems Off
  2. Disconnect the component: Cruise Control Switch Assembly
  3. Ignition On/Vehicle In Service Mode
  4. Test for 11 to 13 V between the test points: 12 V Reference circuit & Ground
    • If less than 11 V 
    1. Ignition/Vehicle Off
    2. Disconnect the electrical connector: K9 Body Control Module
    3. Test for infinite resistance between the test points: 12 V Reference circuit terminal 4 @ K9 Body Control Module X3 & Ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 Ω between the test points: 12 V Reference circuit @ Cruise Control Switch Assembly & K9 Body Control Module X3
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the component: K9 Body Control Module
    • If greater than 13 V 
    1. Ignition/Vehicle Off
    2. Disconnect the electrical connector: K9 Body Control Module
    3. Ignition On/Vehicle In Service Mode
    4. Test for less than 1 V between the test points: 12 V Reference circuit terminal 4 @ K9 Body Control Module X3 & Ground
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the component: K9 Body Control Module
    • If between 11 and 13 V 
  5. Verify the scan tool parameter: Cruise Control Switch Status = Open/Short to Ground
    • If not the specified state 
    1. Ignition/Vehicle Off
    2. Disconnect the electrical connector: K9 Body Control Module
    3. Ignition On/Vehicle In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 9 @ K9 Body Control Module X3 & Ground
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the component: K9 Body Control Module
    • If the specified state 
  6. Connect a 3 A fused jumper wire between the test points: Signal circuit & 12 V Reference circuit
  7. Verify the scan tool parameter: Cruise Control Switch Status = Short to Battery
    • If not the specified state 
    1. Ignition/Vehicle Off & Remove Jumper wire(s)
    2. Disconnect the electrical connector: K9 Body Control Module
    3. Test for less than 2 Ω between the test points: Cruise Control Set/Coast/Resume/Accelerate Switch Signal @ Cruise Control Switch Assembly & K9 Body Control Module X3
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the component: K9 Body Control Module
    • If the specified state 
  8. Test or replace the component: Cruise Control Switch Assembly

Adaptive Cruise Control Gap Up/Down Switch Signal

  1. Ignition/Vehicle & All vehicle systems Off
  2. Disconnect the component: Cruise Control Switch Assembly
  3. Ignition On/Vehicle In Service Mode
  4. Test for 11 to 13 V between the test points: 12 V Reference circuit & Ground
    • If less than 11 V 
    1. Ignition/Vehicle Off
    2. Disconnect the electrical connector: K9 Body Control Module
    3. Test for infinite resistance between the test points: 12 V Reference circuit terminal 4 @ K9 Body Control Module X3 & Ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 Ω between the test points: 12 V Reference circuit @ Cruise Control Switch Assembly & K9 Body Control Module X3
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the component: K9 Body Control Module
    • If greater than 13 V 
    1. Ignition/Vehicle Off
    2. Disconnect the electrical connector: K9 Body Control Module
    3. Ignition On/Vehicle In Service Mode
    4. Test for less than 1 V between the test points: 12 V Reference circuit terminal 4 @ K9 Body Control Module X3 & Ground
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the component: K9 Body Control Module
    • If between 11 and 13 V 
  5. Verify the scan tool parameter: Cruise Control Switch 2 = Open/Short to Ground
    • If not the specified state 
    1. Ignition/Vehicle Off
    2. Disconnect the electrical connector: K9 Body Control Module
    3. Ignition On/Vehicle In Service Mode
    4. Test for less than 1 V between the test points: Adaptive Cruise Control Gap Up/Down Switch Signal @ K9 Body Control Module X3 & Ground
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the component: K9 Body Control Module
    • If the specified state 
  6. Connect a 3 A fused jumper wire between the test points: Adaptive Cruise Control Gap Up/Down Switch Signal & 12 V Reference circuit
  7. Verify the scan tool parameter: Cruise Control Switch 2 = Short to Battery
    • If not the specified state 
    1. Ignition/Vehicle Off & Remove Jumper wire(s)
    2. Disconnect the electrical connector: K9 Body Control Module
    3. Test for less than 2 Ω between the test points: Adaptive Cruise Control Gap Up/Down Switch Signal @ Cruise Control Switch Assembly & K9 Body Control Module X3
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the component: K9 Body Control Module
    • If the specified state 
  8. Test or replace the component: Cruise Control Switch Assembly
scientia non olet · About LEMON Manuals