B1955–POWER LIFTGATE LATCH RELEASE OVERCURRENT

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 stall current of over seven amps has been detected for over 500ms. with no pawl or ratchet failure

Possible Causes

BINDING LIFTGATE

(Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT SHORT TO VOLTAGE

(Q76) LATCH SECONDARY POSITION SENSE CIRCUIT OPEN

(Q85) LIFTGATE LATCH RELEASE CIRCUIT SHORT TO VOLTAGE

(Q901) LOGIC GROUND CIRCUIT OPEN

(G78) LIFTGATE AJAR SWITCH SENSE CIRCUIT OPEN

(Q60) LIFTGATE PAWL SWITCH SENSE CIRCUIT OPEN

LATCH ASSEMBLY

1.DTC PRESENT

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

Does the scan tool display B1955–POWER LIFTGATE LATCH RELEASE OVERCURRENT?

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 AND THE (Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT FOR A SHORT TO VOLTAGE

Is there any voltage present?

Yes

Repair the (Q84) Liftgate Latch Cinch Driver circuit or the (Q85) Liftgate Latch Release Driver circuit for a short to voltage.

4.(Q76) LATCH SECONDARY POSITION SENSE CIRCUIT OPEN

Is the resistance below 2.0 ohms?

Yes

Repair the (Q76) Latch Secondary Position Sense wire for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

5.CHECK THE (Q901) LOGIC GROUND CIRCUIT FOR AN OPEN

Is the resistance below 2.0 ohms?

Yes

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

6.CHECK THE (G78) LIFTGATE AJAR SWITCH SENSE CHECK FOR OPEN

Is the resistance below 2.0 ohms?

Yes

Repair the (G78) Liftgate Ajar Switch Sense wire for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

7.CHECK THE (Q60) LIFTGATE PAWL SWITCH SENSE CIRCUIT FOR AN OPEN

Is the resistance below 2.0 ohms?

Yes

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

Repair the (Q60) Liftgate Pawl Switch Sense circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).