B188D
B188D-POWER LIFTGATE CONTROL CIRCUIT 1 LOWB188D - Power Liftgate Control Circuit 1 Low:
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, this code will set.
POSSIBLE CAUSES
- (Q88) Liftgate open driver circuit short to ground
- (Q88) Liftgate open driver circuit short to (Q89) liftgate close driver circuit
- (Q89) Liftgate close driver circuit short to ground
- Power Liftgate drive unit shorted
- Power liftgate module
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.
Q: 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.
Q: 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.
Q: 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
Q: 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
Q: 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