B1956–POWER LIFTGATE LATCH RELEASE – EXCESSIVE TIME | JEEP Commander 2007 DIY Repair Guide

B1956–POWER LIFTGATE LATCH RELEASE – EXCESSIVE TIME

For a complete wiring diagram Refer to Section 8W

When Monitored:
Whenever the power liftgate is performing a releasing operation.
Set Condition:
The latch motor should perform its operation within 4 seconds. When it takes longer for the release operation, this code will set.

Possible Causes

BINDING LIFTGATE

LOW BATTERY VOLTAGE

LATCH NOT IN HOME POSITION

(Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT OPEN OR HIGH RESISTANCE

(Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT OPEN OR HIGH RESISTANCE

(G78) LIFTGATE SWITCH SENSE CIRCUIT OPEN OR HIGH RESISTANCE

(Q901) LOGIC GROUND CIRCUIT OPEN OR HIGH RESISTANCE

LATCH ASSEMBLY

1.DTC PRESENT

NOTE: If there are any other Power Liftgate DTCs present, repair them before proceeding with this test.

NOTE: Ensure the battery is fully charged and serviceable before proceeding.

Does the scan tool display B1956–POWER LIFTGATE LATCH RELEASE – EXCESSIVE TIME?

Yes

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent condition. Operate the liftgate several times and check for any binding or other obstructions.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

2.BINDING LIFTGATE

Were there any mechanical problems found?

Yes

Refer to Service information for the related symptom(s).
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

3.CHECK THE (Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT FOR AN OPEN OR HIGH RESISTANCE

Is the resistance below 5.0 ohms?

Yes

Repair the (Q84) Liftgate Latch Cinch Driver circuit for high resistance.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

4.CHECK THE (Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT FOR AN OPEN OR HIGH RESISTANCE

Is the resistance below 5.0 ohms?

Yes

Repair the (Q85) Liftgate Latch Release Driver circuit for an open or high resistance.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

5.CHECK THE (Q901) LOGIC GROUND WIRE FOR AN OPEN OR HIGH RESISTANCE

Is the resistance below 5.0 ohms?

No

Repair the (Q901) Logic Ground circuit for an open or high resistance.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Yes

6.CHECK THE (G78) LIFTGATE AJAR SWITCH SENSE CIRCUIT FOR AN OPEN OR HIGH RESISTANCE

Is the resistance below 5.0 ohms?

No

Repair the (G78) Liftgate Ajar Switch Sense circuit for an open or high resistance.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING).

Yes

Replace the Power Liftgate Latch in accordance with the service information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).