Diagnostic Test

VERIFY BUSSED REVERSE GEAR STATUS IN THE RADIO
1. With the scan tool, communicate with the radio and check the Reverse gear message to the Radio.
  Does the Radio see a Reverse gear input?
  
  Yes
  - Go To 2
  No
  - Diagnose any problems with the Radio and Transmission inputs.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE FUSED RUN RELAY OUTPUT CIRCUIT
1. Turn the ignition off.
2. Apply the parking brake.
3. Disconnect the License Plate Lamp/Rear Camera Assembly harness connector.
4. Turn the ignition on.
5. With a 12-volt test light connected to ground, check the (F923) circuit at the Rear Camera connector.
  NOTE:
  The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery. (
  
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3
  No
  - Repair the (F923) circuit for an open or high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE GROUND CIRCUIT
1. Turn the ignition off.
2. With a 12-volt test light connected to 12 volts, check the (Z917) Ground circuit at the Rear Camera harness connector.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Repair the (Z917) Ground circuit for an open or high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (X970) CAMERA SIGNAL, THE (X971) RETURN, AND THE (X972) SHIELD CIRCUITS FOR AN OPEN CIRCUIT
1. Disconnect the Radio harness connector.
2. Measure the resistance of the (X970) (X971) and (X972) circuits between the Rear Camera harness connector and Radio harness connectors.
  Is the resistance below 3.0 Ohms on the (X970) (X971) or (X972) circuits?
  
  Yes
  - Go To 5
  No
  - Repair the appropriate circuit for an open.
  - Replace the Radio in accordance with the Service Information. Refer to DISPLAY, RADIO, REMOVAL AND INSTALLATION .
CHECK THE (X970) CAMERA SIGNAL, THE (X971) RETURN, AND THE (X972) SHIELD CIRCUITS SHORTED TO GROUND
1. Check for continuity between ground between ground and the (X970) (X971) and (X972) circuits at the Radio harness connector.
  Is the resistance below 3.0 Ohms on the (X970) (X971) or (X972) circuits?
  
  Yes
  - Repair the appropriate circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the License Plate Lamp/Rear Camera Assembly in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .