Power Liftgate Module (PLGM)

U0019-CAN B BUS





For a complete wiring diagram Refer to the Wiring Information.

- When Monitored:
Continuously

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





1. VERIFY DTC U0019-CAN B BUS IS ACTIVE
1. Turn the ignition on.
2. With the scan tool, read PLGM DTCs.

Does the scan tool display active: U0019-CAN B BUS?

Yes

- Go To 2

No

- If the DTC is stored, check for an intermittent condition by inspecting the related wiring harness for chaffed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK FOR ACTIVE CAN B BUS RELATED DTCS IN THE FRONT CONTROL MODULE (FCM)
1. With the scan tool, read Front Control Module (FCM) DTCs

Does the scan tool display any active CAN B BUS related DTCs?

Yes

- Perform the appropriate diagnostic procedure. Testing and Inspection.

No

- Go To 3

3. CHECK (D55) CAN B BUS (+) CIRCUIT FOR AN OPEN




1. Turn the ignition off.
2. Disconnect the negative battery cable.
3. Disconnect the Power Liftgate Module C2 connector.
4. Disconnect the Front Control Module (FCM) C1 harness connector.
5. Measure the resistance of the (D55) CAN B Bus (+) circuit between the Front Control Module C1 harness connector and the Power Liftgate Module C2 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. CHECK (D54) CAN B BUS (-) CIRCUIT FOR A SHORT TO THE (D55) CAN B BUS (+) CIRCUIT




1. Measure the resistance between the (D54) CAN B Bus (-) circuit and the (D55) CAN B Bus (+) circuit in the Power Liftgate Module C2 harness connector.

Is the resistance below 2.0 ohms?

Yes

- Repair the (D54) CAN B Bus (-) circuit for a short to the (D55) CAN B Bus (+) circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 5

5. CHECK (D54) CAN B BUS (-) CIRCUIT FOR AN OPEN




1. Measure the resistance of the (D54) CAN B Bus (-) circuit between the Front Control Module C1 connector and the Power Liftgate Module C2 connector.

Is the resistance below 2.0 ohms?

Yes

- Go To 6

No

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

6. CHECK THE (D54) CAN B BUS (-) CIRCUIT FOR A SHORT TO VOLTAGE




1. Turn the ignition on.
2. Measure the voltage of the (D54) CAN B Bus (-) circuit.

Is there any voltage present?

Yes

- Repair the (D54) CAN B Bus (-) circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 7

7. CHECK THE (D55) CAN B BUS (+) CIRCUIT FOR A SHORT TO VOLTAGE




1. Measure the voltage of the (D55) CAN B Bus (+) circuit.

Is there any voltage present?

Yes

- Repair the (D55) CAN B Bus (+) circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 8

8. CHECK THE (D54) CAN B BUS (-) CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off.
2. Measure the resistance between ground and the (D54) CAN B Bus (-) circuit.

Is the resistance below 100 ohms?

Yes

- Repair the (D54) CAN B Bus (-) circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 9

9. CHECK THE (D55) CAN B BUS (+) CIRCUIT FOR A SHORT TO GROUND




1. Measure the resistance between ground and the (D55) CAN B Bus (+) circuit in the PLG C2 connector.

Is the resistance below 100 ohms?

Yes

- Repair the (D55) CAN B Bus (+) circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Power Liftgate Module.
- Perform the BODY VERIFICATION TEST. Body Verification Test.