Communications

U0001-CAN C BUS





For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
With the ignition on.

- Set Condition:
When a module detects a short in either CAN C Bus circuit.





Diagnostic Test

1. TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, record and erase BCM DTC's.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read active BCM DTC's.
Does the scan tool display this DTC as active?

Yes

- Go To 2

No

- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

2. ANTILOCK BRAKE MODULE - INTERNAL SHORT
Turn the ignition off.
Disconnect the Antilock Brake Module harness connector.
Turn the ignition on.
With the scan tool, record and erase BCM DTC's.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read active BCM DTC's.
Does the scan tool display this DTC as active?

Yes

- Go To 3

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace the Antilock Brake Module.
- Perform the ABS VERIFICATION TEST - VER 1. ABS Verification Test

3. POWERTRAIN CONTROL MODULE - INTERNAL SHORT
Turn the ignition off.
Disconnect the Powertrain Control Module C1 harness connector.
Turn the ignition on.
With the scan tool, record and erase BCM DTC's.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read active BCM DTC's.
Does the scan tool display this DTC as active?

Yes

- Go To 4

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Powertrain Control Module.
- Perform the (NGC) POWERTRAIN VERIFICATION TEST VER - 5. Powertrain Verification Test

4. ALL WHEEL DRIVE CONTROL MODULE - INTERNAL SHORT
Turn the ignition off.
Disconnect the All Wheel Drive Control Module harness connector.
Turn the ignition on.
With the scan tool, record and erase BCM DTC's.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read active BCM DTC's.
Does the scan tool display this DTC as active?

Yes

- Go To 5

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the All Wheel Drive Control Module .
- Perform the (NGC) POWERTRAIN VERIFICATION TEST VER - 5. Powertrain Verification Test

5. STEERING ANGLE SENSOR - INTERNAL SHORT
Turn the ignition off.
Remove the Steering Angle Sensor harness connector.
Turn the ignition on.
With the scan tool, record and erase BCM DTC's.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read active BCM DTC's.
Does the scan tool display this DTC as active?

Yes

- Go To 6

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Steering Angle Sensor.
- Perform the BODY VERIFICATION TEST - VER 1.Body Verification Test.

6. (D65) CAN C BUS (+) CIRCUIT SHORTED TO VOLTAGE




NOTE: Ensure all CAN C Bus modules are disconnected before proceeding with the following steps.

Turn the ignition off.
Disconnect the Body Control Module C3 and C4 harness connectors.
Turn the ignition on.
Measure the voltage between the (D65) CAN C Bus (+) circuit and ground.
Is there any voltage present?

Yes

- Repair the (D65) CAN C Bus (+) circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST - VER 1.Body Verification Test.

No

- Go To 7

7. (D64) CAN C BUS (-) CIRCUIT SHORTED TO VOLTAGE




Measure the voltage between the (D64) CAN C Bus (-) circuit and ground.
Is there any voltage present?

Yes

- Repair the (D64) CAN C Bus (-) circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST - VER 1.Body Verification Test.

No

- Go To 8

8. (D65) CAN C BUS (+) CIRCUIT SHORTED TO GROUND




Turn the ignition off.
Measure the resistance between ground and the (D65) CAN C Bus (+) circuit.
Is any resistance present?

Yes

- Repair the (D65) CAN C Bus (+) circuit for a short to ground.
- Perform the BODY VERIFICATION TEST - VER 1.Body Verification Test.

No

- Go To 9

9. (D64) CAN C BUS (-) CIRCUIT SHORTED TO GROUND




Measure the resistance between ground and the (D64) CAN C Bus (-) circuit.
Is any resistance present?

Yes

- Repair the (D64) CAN C Bus (-) circuit for a short to ground.
- Perform the BODY VERIFICATION TEST - VER 1.Body Verification Test.

No

- Go To 10

10. (D65) CAN C BUS (+) CIRCUIT SHORTED TO (D64) CAN C BUS (-) CIRCUIT




Measure the resistance between the (D65) CAN C Bus (+) circuit and the (D64) CAN C Bus (-) circuit.
Is any resistance present?

Yes

- Repair the (D65) CAN C Bus (+) circuit for a short to the (D64) CAN C Bus (-) circuit.
- Perform the BODY VERIFICATION TEST - VER 1.Body Verification Test.

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Body Control Module.
- Perform the BODY VERIFICATION TEST - VER 1.Body Verification Test.