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. With the scan tool, read the active DTCs.
2. Cycle the ignition switch from off to on, wait for a minimum of 30 seconds after cycling ignition.
3. 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.

2. CHECK TIPM DTCs
1. With the scan tool, read the TIPM active DTCs.

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

Yes

- Testing and Inspection Perform the appropriate diagnostic test.

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 C1 harness connector.
4. Disconnect the TIPM C5 harness connector.
5. Measure the resistance of the (D55) CAN B Bus (+) circuit between the TIPM C5 connector and the Hands Free Module C1 connector.

Is the resistance below 10K 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 TIPM C5 connector and the Hands Free Module C1 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.