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U0019-CAN B BUS

For complete wiring diagrams refer to Diagrams/Electrical.

- When Monitored:

Continuously

- Set Condition:

Whenever the CAN B Bus (+) or CAN B Bus (-) circuit is open, shorted to voltage or shorted to ground.

Diagnostic Test

1. CHECK FOR ACTIVE DTCS

With the scan tool, read the active 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 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 the Front Control Module active DTC's.

Does the scan tool display any CAN B BUS DTC's - ACTIVE?

Yes

- Refer to Computers and Control Systems / Testing and Inspection / Diagnostic Trouble Code Charts and Associated Procedures.

No

- Go To 3

3. (D55) CAN B BUS (+) CIRCUIT OPEN

Turn the ignition off.

Disconnect the negative battery cable.

Disconnect the Hands Free Module harness connector.

Disconnect the Front Control Module C1 harness connector.

Measure the resistance of the (D55) CAN B Bus (+) circuit between the Front Control Module C1 connector and the Hands Free Module connector.

Is the resistance below 2.0 ohms?

Yes

- Go To 4

No

- Repair the (D55) CAN B Bus (+) circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

4. (D54) CAN B BUS (-) CIRCUIT OPEN

Measure the resistance of the (D54) CAN B Bus (-) circuit between the Front Control Module C1 connector and the Hands Free Module connector.

Is the resistance below 2.0 ohms?

Yes

- Replace the Hands Free Module.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Repair the (D54) CAN B Bus (-) circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test