B1891-POWER LIFTGATE CONTROL CIRCUIT 2 LOW
For a complete wiring diagram Refer to Section 8W
- 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.
| Possible Causes |
| (Q89) LIFTGATE CLOSE DRIVER CIRCUIT SHORT TO GROUND |
| (Q89) LIFTGATE CLOSE DRIVER CIRCUIT SHORT TO (Q88) LIFTGATE OPEN DRIVER CIRCUIT |
| (Q88) LIFTGATE OPEN DRIVER CIRCUIT SHORT TO GROUND |
| POWER LIFTGATE DRIVE UNIT SHORTED |
| POWER LIFTGATE MODULE |
Diagnostic Test
1. DTC PRESENTWith the scan tool, record DTCs.
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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE) .
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 To4
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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Replace the Power Liftgate Driver Unit in accordance with service information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Go to 5
5. (Q88) LIFTGATE OPEN DRIVER CIRCUIT SHORT TO GROUND
Reconnect the Power Liftgate Module C1 harness connector.
Measure the resistance between ground and the (Q88) Liftgate Open Driver circuit.
Is the resistance above 1000.0 ohms?
Yes
- Replace the Power Liftgate Module in accordance with service information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
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 in accordance with the service information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).