B1953–POWER LIFTGATE LATCH CINCH OVERCURRENT

For a complete wiring diagram Refer to Section 8W

When Monitored:
Whenever the power liftgate is performing a cinching operation.
Set Condition:
The latch motor stall current of 12.0 amps has been detected for over 500ms, with no pawl or ratchet failure.

Possible Causes

BINDING LIFTGATE

LATCH NOT IN HOME POSITION

(Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT OPEN

(Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT OPEN

(Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT SHORT TO GROUND

(Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT SHORT TO THE (Q901) LOGIC GROUND CIRCUIT

(Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT SHORT TO GROUND

(Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT SHORT TO THE (Q901) LOGIC GROUND CIRCUIT

(Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT SHORT TO VOLTAGE

POWER LIFTGATE MODULE

LATCH ASSEMBLY

Diagnostic Test

1.DTC PRESENT

Does the scan tool display B1953–POWER LIFTGATE LATCH CINCH OVERCURRENT?

Yes

Go To2

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 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).

Go To3

3.(Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT OPEN

Is the resistance below 5.0 ohms?

Yes

Go To4

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

4.(Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT OPEN

Is the resistance below 5.0 ohms?

Yes

Go To5

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

5.(Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT SHORT TO GROUND

Is the resistance below 1000.0 ohms?

No

Go To6

Yes

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

6.(Q84) LIFTGATE LATCH CINCH DRIVER CIRCUIT SHORT TO THE (Q901) LOGIC GROUND CIRCUIT

Is the resistance below 1000.0 ohms?

No

Go To7

Yes

Repair the (Q84) Liftgate Latch Cinch Driver wire for a short to the (Q901) Logic Ground circuit.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

7.(Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT SHORT TO GROUND

Is the resistance below 1000.0 ohms?

No

Go To8

Yes

Repair the (Q85) Liftgate Latch Release Driver circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

8.(Q85) LIFTGATE LATCH RELEASE DRIVER CIRCUIT FOR A SHORT TO THE (Q901) LOGIC GROUND CIRCUIT

Is the resistance below 1000.0 ohms?

No

Go To 9

Yes

Repair the (Q85) Liftgate Latch Release Driver circuit for a short to the (Q901) Logic Ground circuit.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

9.(Q84) LIFTGATE LATCH CINCH DRIVER WIRE SHORT TO VOLTAGE

Is there any voltage present?

No

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

Yes

Repair the (Q84) Liftgate Latch Cinch Driver circuit for a short to voltage. If the (Q84) Liftgate Latch Cinch Driver circuit is OK, replace the Power Liftgate Module in accordance with the service information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).