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 PROCEDURESREAR VISION CAMERA SYSTEM MALFUNCTION (WITH IOB)CIRCUIT/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 and all vehicle systems OFF, disconnect the X900 harness connector. It may take up to 2 min for all vehicle systems to power down.
- Test for less than 10 Ω between the ground circuit terminal 7 and ground.
- If 10 Ω or greater
- Ignition OFF.
- Test for less than 2 Ω in the ground circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, repair the open/high resistance in the ground connection.
- If less than 10 Ω
- Ignition ON.
- Verify a test lamp illuminates between the ignition circuit terminal 4 and ground.
- If the test lamp does not illuminate and the circuit fuse is good
- Ignition OFF.
- Test for less than 2 Ω in the ignition circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse. Refer to Power Mode Mismatch .
- If the test lamp does not illuminate and the circuit fuse is open
- Ignition OFF.
- Test for infinite resistance between the ignition circuit and ground.
- If less than infinite resistance, repair the short to ground on the circuit.
- If infinite resistance, replace the B87 Rearview Camera.
- If the test lamp illuminates
- Engine running, park brake applied, transmission in R.
- Verify a test lamp illuminates between the control circuit terminal 2 and ground.
- If the test lamp does not illuminate
- Ignition OFF.
- Test for less than 2 Ω in the ignition circuit end to end.
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, verify the fuse is good and there is voltage at the fuse. Refer to Backup Lamps Malfunction (Manual Transmission)Backup Lamps Malfunction (Automatic Transmission) .
- If the test lamp illuminates
- Ignition OFF, disconnect the X1 harness connector at the A11 Radio, ignition ON.
- Test for less than 1 V between the signal circuit terminals listed below and ground:
- A11 Radio signal (+) circuit terminal 15 X1
- A11 Radio signal (-) circuit terminal 14 X1
- If 1 V or greater
Repair the short to voltage on the circuit.
- If less than 1 V
- Test for infinite resistance between the signal circuit terminals listed below and ground:
- A11 Radio signal (+) circuit terminal 15 X1
- A11 Radio signal (-) circuit terminal 14 X1
- If less than infinite resistance
Repair the short to ground on the circuit.
- If infinite resistance
- Test for less than 2 Ω between the A11 Radio signal (+) circuit terminal 15 X1 and the X900 signal (+) circuit terminal 3.
- If 2 Ω or greater
Repair the open/high resistance on the circuit.
- If less than 2 Ω
- If 2 Ω or greater
- Test for less than 2 Ω between the A11 Radio signal (-) circuit terminal 14 X1 and the X900 signal (-) circuit terminal 8.
- If 2 Ω or greater
Repair the open/high resistance on the circuit.
- If less than 2 Ω
- If 2 Ω or greater
- Replace the B87 Rearview Camera.
- Engine running, transmission in R,
- Verify a clear rear vision image is displayed on the P17 Info Display Module.
- If a clear rear vision image is not displayed
Replace the A11 Radio.
- If a clear rear vision image is displayed
- If a clear rear vision image is not displayed
- All OK.
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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.