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HOMESERVICE MANUALSGMC2009CANYON 4D PICKUP, 2.9 9REPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEIGNITION SWITCH/STEERING LOCKIMMOBILIZER SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B2957, B2958, B2960, OR B3033CIRCUIT/SYSTEM TESTING
2009 GMC Canyon 4D Pickup, 2.9 9

Circuit/System Testing

2009 GMC Canyon 4D Pickup, 2.9 9SECTION Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the ignition switch.
  2. Ignition ON, test for 4.8-5.2 volts between the 5 V reference circuit terminal 5 and ground.
    • If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  3. Ignition OFF, connect the harness connector at the ignition switch. Disconnect the X2 harness connector at the BCM.
  4. Ignition in the CRANK position, test for 10Ξ©-18k Ξ© between the 5 V reference circuit terminal A42 and the signal circuit terminal A14.
    • If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, test or replace the ignition switch.
    • If less than the specified range, test or replace the ignition switch.
  5. Connect the X2 harness connector at the BCM.
    6. IMPORTANT: Do not start the vehicle. Observe the parameter while momentarily placing the ignition switch in the CRANK position.
  6. Ignition in the CRANK position, verify the scan tool BCM Ign. Off/Run/Crank parameter is Active.
    • If not the specified value, test the signal terminal A14 circuit for a short to ground. If the circuit tests normal, replace the BCM.
  7. If all circuits test normal, test or replace the ignition switch.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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