B1891

B1891-POWER LIFTGATE CONTROL CIRCUIT 2 LOW





For a complete wiring diagram refer to Diagrams/Electrical

- 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.





Diagnostic Test

1.DTC PRESENT

With the scan tool, record DTC's.

Erase DTC's

Turn the ignition off, wait 10 seconds, then turn the ignition on.

If possible, operate the liftgate several times.

With 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 BODY VERIFICATION TEST - VER 1. Body Verification Test

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





Turn the ignition off.

Disconnect the Power Liftgate Module C1 connector.

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





Disconnect the Power Liftgate Drive Unit connector.

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

Is the resistance below 1000.0 ohms?

Yes

- Repair the (Q89) Liftgate Close Driver circuit for a short to the (Q88) Liftgate Open Driver circuit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace the Power Liftgate Driver Unit.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

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





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

Is the resistance below 1000.0 ohms?

Yes

- Repair the (Q89) Liftgate Close Driver circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 5

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





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

Is the resistance below 1000.0 ohms?

Yes

- Repair the (Q88) Liftgate Open Driver circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

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