Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2016 GMC Sierra 3500 HD, 2016 GMC Sierra 2500 HD, 2016 GMC Sierra 1500, 2016 Chevrolet Silverado 3500 HD, and 2016 Chevrolet Silverado 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
- 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 X2 harness connector at the K74 Human Machine Interface Control Module, ignition ON.
- Test for less than 1 V between the signal circuit terminals listed below and ground:
- K74 Human Machine Interface Control Module signal (+) circuit terminal 5 X2
- K74 Human Machine Interface Control Module signal (-) circuit terminal 6 X2
- 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:
- K74 Human Machine Interface Control Module signal (+) circuit terminal 5 X2
- K74 Human Machine Interface Control Module signal (+) circuit terminal 6 X2
- If less than infinite resistance
Repair the short to ground on the circuit.
- If infinite resistance
- Test for less than 2 Ω between the K74 Human Machine Interface Control Module signal (+) circuit terminal 5 X2 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 K74 Human Machine Interface Control Module signal (-) circuit terminal 6 X2 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 K74 Human Machine Interface Control Module.
- If a clear rear vision image is displayed
- If a clear rear vision image is not displayed
- All OK.