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 MANUALSGMC2016SIERRA 3500 HD SLE, 4D CAB CHASSIS, 6.6L ENG VIN 8, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTDRIVERS ASSISTANCE SYSTEMS - ADASOBJECT DETECTION SYSTEM AND PEDESTRIAN PROTECTION SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B0968: PARKING ASSIST ON/OFF SWITCHCIRCUIT/SYSTEM TESTING
2016 GMC Sierra 3500 HD SLE, 4D Cab Chassis, 6.6L Eng VIN 8, 4WD
Circuit/System Testing
2016 GMC Sierra 3500 HD SLE, 4D Cab Chassis, 6.6L Eng VIN 8, 4WDSECTION Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the S48A Multifunction Switch - Instrument Panel, ignition ON.
- Verify a test lamp illuminates between the control circuit terminal 2 and ground.
- If the test lamp does not illuminate
- Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
- Test for less than 2 Ω in the control circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, refer to Interior Backlighting Malfunction .
- If the test lamp illuminates
- Ignition OFF, connect the harness connector at the S48A Multifunction Switch - Instrument Panel. Disconnect the X1 harness connector at the K41 Front and Rear Parking Assist Control Module.
- Verify the parking assist switch indicator is not illuminated.
- If the parking assist switch indicator is illuminated
- Ignition OFF, disconnect the harness connector at the S48A Multifunction Switch - Instrument Panel.
- Test for infinite resistance between the S48A Multifunction Switch - Instrument Panel control circuit terminal 6 and ground.
- If less than infinite resistance, repair the short to ground in the circuit.
- If infinite resistance, replace the S48A Multifunction Switch - Instrument Panel.
- If the parking assist switch indicator is not illuminated
- Connect a 3 A fused jumper wire between the control circuit terminal 3 and ground.
- Verify the parking assist switch indicator is illuminated.
- If the parking assist switch indicator is not illuminated
- Ignition OFF, disconnect the harness connector at the S48A Multifunction Switch - Instrument Panel.
- Test for less than 1 V between the control circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V
- Ignition OFF.
- Test for less than 2 Ω in the control circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the S48A Multifunction Switch - Instrument Panel.
- If the parking assist switch indicator is illuminated
- Replace the K41 Front and Rear Parking Assist Control Module.
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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.