U0001-CAN C BUS
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the ignition on.
- Set Condition:
Whenever the CAN C Bus (+) or CAN C Bus (-) circuit is open, shorted to voltage or shorted to ground.
| Possible Causes |
| CAN C BUS DTC's IN FRONT CONTROL MODULE |
| (D65) CAN C BUS (+) CIRCUIT OPEN |
| (D64) CAN C BUS (-) CIRCUIT OPEN |
| STEERING COLUMN MODULE |
Diagnostic Test
1. CHECK FOR ACTIVE DTCSWith the scan tool, read the active SCM DTC's.
Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle.
With the scan tool, read the active SCM DTC's.
Does the scan tool display this DTC as active?
Yes
- Go To 2
No
- If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2. CHECK FRONT CONTROL MODULE DTC's
With the scan tool, read Front Control Module active DTC's
Does the scan tool display any CAN C BUS DTC's – ACTIVE?
Yes
No
- Go To 3
3. (D65) CAN C BUS (+) CIRCUIT OPEN
Turn the ignition off.
Disconnect the negative battery cable.
Disconnect the Steering Column Module C1 harness connector.
Disconnect the Front Control Module C1 connector.
Measure the resistance of the (D65) CAN C Bus (+) circuit between the Front Control Module connector and the Steering Column Module connector.
Is the resistance below 2.0 ohms?
Yes
- Go To 4
No
- Repair the (D65) CAN C Bus (+) circuit for an open.
4. (D64) CAN C BUS (–) CIRCUIT OPEN
Measure the resistance of the (D64) CAN C Bus (–) circuit between the Front Control Module connector and the Steering Column Module connector.
Is the resistance below 2.0 ohms?
Yes
- Replace the Steering Column Module in accordance with the service information.
No
- Repair the (D64) CAN C Bus (–) circuit for an open.