Intrusion Transceiver Module (ITM)

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 DIAGNOSTIC TROUBLE CODE (DTC)S
1. Using the scan tool, read the active DTCs.
2. Cycle the ignition switch from off to on at least five times, leaving the ignition on for a minimum of 90 seconds per cycle.
3. Using 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. Using the scan tool, read TIPM active DTCs.

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

Yes

- Go to and perform the appropriate diagnostic procedure.

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

Is the resistance below 2.0 Ohms?

Yes

- Replace the Intrusion Transceiver 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.