B1976–POWER LIFTGATE LATCH RELEASE – RATCHET SECONDARY SWITCH PERFORMANCE

For a complete wiring diagram Refer to Section 8W

When Monitored:
Whenever the power liftgate is fully open.
Set Condition:
The ratchet switch and pawl switches are closed while the secondary switch is open.

Possible Causes

BINDING LIFTGATE

(Q901) LOGIC GROUND CIRCUIT OPEN

(Q76) LATCH SECONDARY POSITION SENSE CIRCUIT OPEN

(Q76) LATCH SECONDARY POSITION SENSE CIRCUIT SHORT TO VOLTAGE

(Q76) LATCH SECONDARY POSITION SENSE CIRCUIT SHORT TO GROUND

POWER LIFTGATE DRIVE UNIT

POWER LIFTGATE LATCH

POWER LIFTGATE MODULE

Diagnostic Test

1.DTC PRESENT

NOTE: This DTC will only set during the latching operation after the four second time out. This may make it difficult to reproduce.

Does the scan tool display B1976–POWER LIFTGATE LATCH RELEASE – RATCHET SECONDARY SWITCH PERFORMANCE?

Yes

Go To2

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent condition. Operate the door 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

Does it take more effort to operate the liftgate than it should?

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 To 3

3.POWER LIFTGATE MODULE

Did the scan tool show the switch state changing correctly every time?

No

Go To4

Yes

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).

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

Is the resistance below 9.5 ohms?

Yes

Go To5

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

5.CHECK THE (Q76) LATCH SECONDARY POSITION SENSE CIRCUIT FOR A SHORT TO GROUND

Is the resistance below 10000.0 ohms?

No

Go To 6

Yes

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

6.CHECK THE (Q76) LATCH SECONDARY POSITION SENSE CIRCUIT FOR AN OPEN

Is the resistance below 2.0 ohms?

No

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

Yes

Go To 7

7.CHECK THE (Q76) LATCH SECONDARY POSITION SENSE CIRCUIT FOR A SHORT TO VOLTAGE

Is there any voltage present?

No

Go To 8

Yes

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

8.POWER LIFTGATE DRIVE UNIT

Does the scan tool display this DTC?

Yes

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).

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).