B1891

B1891-POWER LIFTGATE CONTROL CIRCUIT 2 LOW





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

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

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





1. DIAGNOSTIC TROUBLE CODE (DTC) PRESENT
1. Using the scan tool, record DTCs.
2. Erase DTCs.
3. Turn the ignition off, wait 10 seconds, then turn the ignition on.
4. If possible, operate the liftgate several times.
5. Using the scan tool, read 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 harness 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)?

Yes

- Go To 3

No

- Go To 4

3. POWER LIFTGATE DRIVE UNIT




1. Disconnect the Power Liftgate Drive Unit harness 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. Reconnect the Power Liftgate Module C1 harness connector.
2. Measure the resistance between ground and the (Q88) Liftgate Open Driver circuit.

Is the resistance above 1,000 Ohms?

Yes

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

No

- Repair the (Q88) Liftgate Open Driver circuit for a short to ground. If the (Q88) Liftgate Open Driver is OK, replace the Power Liftgate Drive Unit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.