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 power 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 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 B1889-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. (Q88) LIFTGATE OPEN DRIVER CIRCUIT SHORT TO GROUND




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

Is the resistance below 1,000 Ohms?

Yes

- Go To 3

No

- Go To 4

3. (Q88) LIFTGATE OPEN DRIVER WIRE SHORTED TO GROUND




1. Disconnect the Power Liftgate Drive Unit connector.
2. 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 Drive Unit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. CHECK THE (Q89) LIFTGATE CLOSE DRIVER FOR A SHORT TO GROUND




1. Measure the resistance between ground and the (Q89) Liftgate Close Driver circuit in the Power Liftgate Module C1 connector.

Is the resistance below 1,000 Ohms?

No

- Go To 6

Yes

- Go To 5

5. CHECK THE (Q89) LIFTGATE CLOSE DRIVER WIRE FOR A SHORT TO GROUND




1. Disconnect the Power Liftgate Drive Unit connector.
2. Measure the resistance between ground and the (Q89) Liftgate Close Driver circuit in the Power Liftgate Module C1 connector.

Is the resistance below 1,000 Ohms?

No

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

Yes

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

6. (Q88) LIFTGATE OPEN DRIVER CIRCUIT SHORT TO (Q89) LIFTGATE CLOSE DRIVER CIRCUIT




1. Measure the resistance between the (Q88) Liftgate Open Driver circuit and the (Q89) Liftgate Close Driver circuit.

Is the resistance below 1.0 Ohms (should be approximately 4.3 Ohms) ?

No

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

Yes

- Go To 7

7. (Q88) LIFTGATE OPEN DRIVER WIRE SHORTED TO THE (Q89) LIFTGATE CLOSE DRIVER WIRE




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

Is the resistance below 1,000 Ohms?

No

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

Yes

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