B1891

B1891-POWER LIFTGATE CONTROL CIRCUIT 2 LOW





For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams.

- When Monitored:
Whenever the Power Liftgate is power opening or closing.

- Set Condition:
When the Power Liftgate Module senses voltage less than 1.5 volts on the (Q89) Liftgate Close Driver circuit prior to starting a power liftgate open or close cycle, this code will set.





1. DTC PRESENT
1. With the scan tool, record the DTCs.
2. Erase the DTCs.
3. Turn the ignition off, wait 10 seconds, then turn the ignition on.
4. If possible, operate the liftgate several times.
5. With the scan tool, read the DTCs.

Does the scan tool display B1891-POWER LIFTGATE CONTROL CIRCUIT 2 LOW?

Yes

- Go To 2

No

- Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent condition.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. (Q89) LIFTGATE CLOSE DRIVER CIRCUIT SHORTED TO THE (Q88) LIFTGATE OPEN DRIVER CIRCUIT




1. Turn the ignition off.
2. Disconnect the Power Liftgate Module C1 connector.
3. Measure the resistance between the (Q89) Liftgate Close Driver circuit and the (Q88) Liftgate Open Driver circuit

Is the resistance below 3.0 Ohms (should be approximately 4.3 Ohms)?

No

- Go To 4

Yes

- Go To 3

3. POWER LIFTGATE DRIVE UNIT




1. Disconnect the Power Liftgate Drive Unit connector.
2. Measure the resistance between the (Q89) Liftgate Close Driver circuit and the (Q88) Liftgate Open Driver circuit.

Is the resistance below 1,000 Ohms?

Yes

- Repair the (Q89) Liftgate Close Driver circuit for a short to the (Q88) Liftgate Open Driver circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

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

4. (Q89) LIFTGATE CLOSE DRIVER CIRCUIT SHORTED TO GROUND




1. Measure the resistance between ground and the (Q89) Liftgate Close Driver circuit

Is the resistance below 1,000 Ohms?

Yes

- Repair the (Q89) Liftgate Close Driver circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 5

5. (Q88) LIFTGATE OPEN DRIVER CIRCUIT SHORTED TO GROUND




1. Measure the resistance between ground and the (Q88) Liftgate Open Driver circuit

Is the resistance below 1,000 Ohms?

Yes

- Repair the (Q88) Liftgate Open Driver 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.