Amplifier (AMP)

U0019-CAN B BUS



- When Monitored:
Continuously.

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





1. TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, record and erase the DTCs.
3. Cycle the ignition from on to off three times.
4. Turn the ignition on.
5. With the scan tool, read the DTCs.

Does the scan tool display U0019-CAN B BUS CIRCUIT?

Yes

- Go To 2

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and poor pin fit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK TOTALLY INTEGRATED POWER MODULE DTCs
1. With the scan tool, read the TIPM DTCs.

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

Yes

- Testing and Inspection Perform the appropriate diagnostic procedure.

No

- Go To 3

3. CAN B BUS (+) CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Amplifier C1 harness connector.
3. Disconnect the TIPM C3 harness connector.
4. Measure the resistance of the (D55) CAN B Bus (+) circuit between the TIPM harness connector and the Amplifier C1 harness connector.

Is the resistance below 2.0 Ohms?

Yes

- Go To 4

No

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

4. CAN B BUS (-) CIRCUIT OPEN




1. Measure the resistance of the (D54) CAN B Bus (-) circuit between the TIPM harness connector and the Amplifier C1 harness connector.

Is the resistance below 2.0 Ohms?

Yes

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

No

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