Power Liftgate

U0019-CAN B BUS - PLGM





For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
When the key is on for more than 5 seconds

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





Diagnostic Test

1. VERIFY DTC U0019-CAN B BUS IS ACTIVE
Turn the ignition on.
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 chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test Body Verification Test

2. CHECK FOR ACTIVE CAN B BUS RELATED DTCS IN THE BODY CONTROL MODULE (BCM)
With the scan tool, read Body Control Module (BCM) DTCs
Does the scan tool display any active CAN B BUS related DTCs?

Yes

- Diagnose and repair the DTC(s).

No

- Go To 3

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




Turn the ignition off.
Disconnect the negative battery cable.
Disconnect the Power Liftgate Module C2 connector.
Disconnect the Body Control Module (BCM) C3 harness connector.
Measure the resistance of the (D55) CAN B Bus (+) circuit between the Body Control Module C3 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 BODY VERIFICATION TEST - VER 1. Body Verification Test Body Verification Test

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




Measure the resistance of the (D54) CAN B Bus (-) circuit between the Body Control Module C3 connector and the Power Liftgate Module C2 connector.
Is the resistance below 2.0 ohms?

Yes

- Replace the Power Liftgate Module.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test Body Verification Test

No

- Repair the (D54) CAN B Bus (-) circuit for an open.
- PERFORM BODY VERIFICATION TEST - VER 1. Body Verification Test Body Verification Test