2024 GMC Canyon AT4XFACTORY OEM SERVICE PROCEDURE

Circuit/System Testing

  1. Ignition OFF, disconnect the X3 connector at the K9 Body Control Module, ignition ON.
  2. Verify the lane keep assist indicator is not illuminated.
    • If the indicator is illuminated 
    1. Test circuit 3152 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found
    2. Replace the S36 Dimmer Switch.
    • Go to next step: If the indicator is not illuminated 
  3. Connect a 3 A fused jumper wire between control circuit terminal 13 and B+.
  4. Verify the lane keep assist indicator is illuminated.
    • Go to next step: If the indicator is not illuminated 
    1. Test circuit 1550 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit or the ground connection.
      • Go to next step: If an open/high resistance is not found
    2. Test circuit 3152 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found
    3. Test circuit 3152 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found
    4. Replace the S36 Dimmer Switch.
    • If the indicator is illuminated 
  5. Replace the K9 Body Control Module.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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