Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC2011YUKON BASE, 5.3 0, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTIGNITION SWITCH/STEERING LOCKWIRING SYSTEMS AND POWER MANAGEMENT - DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC INFORMATION AND PROCEDURESDTC B1441CIRCUIT/SYSTEM TESTING
2011 GMC Yukon Base, 5.3 0, RWD
Circuit/System Testing
2011 GMC Yukon Base, 5.3 0, RWDSECTION Circuit/System Testing
NOTE:
You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
- Inspect for an open Ign Switch fuse. The fuse should be OK.
- If the fuse is open, test the following circuits for a short to ground, if all circuits test OK, replace the BCM.
- Battery positive voltage of the ignition switch
- Accessory voltage
- Off/Run/Crank voltage
- Ignition 1 voltage
- Accessory wakeup serial data (BCM output)
- Run/crank ignition 1 voltage (BCM output)
- Disconnect the harness connector at the ignition switch.
- Verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.
- If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
- Perform the ignition switch component test. The test should pass.
- If the ignition switch fails, replace the ignition switch.
- Ignition OFF, disconnect the X1 harness connector at the BCM, test for less than 1.0 volt between the following circuit terminals of the BCM and ground.
- Ignition key resistor signal terminal 4
- Off/Run/Crank voltage terminal 2
- Accessory voltage terminal 21
- Ignition 1 voltage terminal 14
- If greater than specified, test the circuit for a short to voltage.
- Test for less than 1.0 ohm of resistance between the BCM and the ignition switch on the following circuit terminals.
- Ignition key resistor signal, BCM terminal 4 and ignition switch terminal 6
- Off/Run/Crank voltage, BCM terminal 2 and ignition switch terminal 5
- Accessory voltage, BCM terminal 21 and ignition switch terminal 3
- Ignition 1 voltage, BCM terminal 14 and ignition switch terminal 2
- If greater than specified, repair the circuit for open/high resistance
- Test for infinite resistance between the ignition key resistor signal circuit terminal 4 of the BCM and ground.
- If less than specified, repair the signal circuit for a short to ground.
- If all circuits test normal, replace the BCM.
NOTE:
The ignition switch component test must be preformed before proceeding with this test to verify the integrity of the switch.
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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.