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Home >> GMC >> 2021 >> Yukon AT4 >> Repair and Diagnosis >> Brakes >> Traction Control >> Antilock Brake System >> Diagnostic Information and Procedures >> Hill Descent Control Indicator Malfunction >> Circuit/System Testing

Circuit/System Testing

    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle = OFF
  2. Disconnect the electrical connector: S86 Vehicle Stability Control System Switch
  3. Test for less than 10 ohms between the test points: Ground circuit terminal 10 & Ground
    • If 10 ohms or greater 
    1. Disconnect the ground connection: G200
    2. Test for less than 2 ohms between the test points: Ground circuit terminal 10 @ Instrument Panel Multifunction Switch & Terminal G200
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  4. Ignition - On / Vehicle - In Service Mode
  5. Verify the scan tool parameter: Hill Descent Control Switch @ K9 Body Control Module = Disabled
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X3 Harness Connector @ K9 Body Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 30 @ X3 Harness Connector & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K9 Body Control Module
    • Go to next step: If the specified state 
  6. Connect a 3 A fused jumper wire between the test points:

    S86 Vehicle Stability Control System Switch Signal circuit terminal 9 & Ground circuit terminal 10

  7. Verify the scan tool parameter: Traction Control Switch @ K9 Body Control Module = Active
    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: X3 Harness Connector @ K9 Body Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:

      S86 Vehicle Stability Control System Switch Signal circuit terminal 9 & 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/Vehicle - Off
    6. Test for less than 2 ohms between the test points:
      • S86 Vehicle Stability Control System Switch Signal circuit terminal 9 & Terminal 30 @ X3 Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K9 Body Control Module
    • Go to next step: If the specified state 
  8. Test or replace the component: S86 Vehicle Stability Control System Switch
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