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HOMESERVICE MANUALSGMC2009CANYON 4D PICKUP, 2.9 9REPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEDOOR LOCKSKEYLESS ENTRY SYSTEM AND REMOTE FUNCTIONSDIAGNOSTIC INFORMATION AND PROCEDURESKEYLESS ENTRY SYSTEM INOPERATIVECIRCUIT/SYSTEM VERIFICATION
2009 GMC Canyon 4D Pickup, 2.9 9

Circuit/System Verification

2009 GMC Canyon 4D Pickup, 2.9 9SECTION Circuit/System Verification
  1. Verify that the transmitter is the correct transmitter for the vehicle.
    • If not the correct transmitter, replace the transmitter.
  2. Place the transmitter on the test pad of the J 43241  and press each button of the transmitter one at a time. The tester should sound a tone and illuminate a green light when each button is pressed.
    • If one or more buttons does not sound the tone and illuminate the green light, replace the transmitter battery and retest with the J 43241  . If the condition continues after battery replacement, replace the transmitter.
  3. Verify the scan tool No. of Fobs Programmed parameter is greater than Fob 0.
  4. Operate the transmitter while observing the scan tool Door Lock Output and Door Unlock Output parameters. The parameter should correspond with the function selected on the transmitter.
    • If the parameter does not match the function selected on the transmitter, program the transmitter and retest. Refer to Transmitter Programming . If the condition continues after transmitter programming, replace the transmitter.
  5. With a scan tool, command the door locks to LOCK and UNLOCK.
    • If the door locks do not LOCK, test for a short to voltage or open/high resistance in the Driver Door Lock/ Window Switch LOCK signal circuit.
    • If the door locks do not UNLOCK, test for a short to voltage or open/high resistance in the Driver Door Lock/ Window Switch UNLOCK signal circuit.
  6. If all circuits test normal, replace the BCM.
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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.