Hands Free Module (HFM)

U0019-CAN B BUS





For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams.

- When Monitored:
Continuously

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





1. CHECK FOR ACTIVE DTCS
1. Turn the ignition on.
2. With the scan tool, read the active DTCs.

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.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK TOTALLY INTEGRATED POWER MODULE DTCs
1. With the scan tool, read Totally Integrated Power Module active DTCs

Does the scan tool display any CAN B BUS DTCs - ACTIVE?

Yes

- Perform the appropriate CAN B Bus diagnostic procedure.Testing and Inspection

No

- Go To 3

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




1. Turn the ignition off.
2. Disconnect the negative battery cable.
3. Disconnect the Hands Free Module harness connector.
4. Disconnect the Totally Integrated Power Module C6 harness connector.
5. Measure the resistance of the (D55) CAN B Bus (+) circuit between the Totally Integrated Power Module C6 harness connector and the Hands Free Module harness connector.

Is the resistance below 2.0 Ohms?

Yes

- Go To 4

No

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

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




1. Measure the resistance of the (D54) CAN B Bus (-) circuit between the Totally Integrated Power Module C6 connector and the Hands Free Module connector.

Is the resistance below 2.0 Ohms?

Yes

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

No

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