B188D

B188D-POWER LIFTGATE CONTROL CIRCUIT 1 LOW





For a complete wiring diagram Consult 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 (Q88) Liftgate Open Driver circuit prior to starting a power liftgate 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 B188D-POWER LIFTGATE CONTROL CIRCUIT 1 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. (Q88) LIFTGATE OPEN DRIVER CIRCUIT SHORT TO (Q89) LIFTGATE CLOSE DRIVER CIRCUIT




Turn the ignition off.
Disconnect the Power Liftgate Module C1 connector.
Measure the resistance between the (Q88) Liftgate Open Driver circuit and the (Q89) Liftgate Close 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 (Q88) Liftgate Open Driver circuit and the (Q89) Liftgate Close Driver circuit.
Is the resistance below 1000.0 ohms?

Yes

- Repair the (Q88) Liftgate Open Driver circuit for a short to the (Q89) Liftgate Close Driver circuit.

No

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

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




Measure the resistance between ground and the (Q88) Liftgate Open Driver circuit in the PLGM C1 connector.
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

- Go To 5


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




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

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