B396F

DTC B396F

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.



DTC Descriptors
DTC B396F 06
- Liftglass Ajar Output Signal Circuit Short to Ground or Open

DTC B396F 0B
- Liftglass Ajar Output Signal Circuit Current Above Threshold




Diagnostic Fault Information






Circuit/System Description

The liftgate control module (LGM) provides an output signal to the rear wiper motor for the purpose of disabling wiper motor operation whenever the liftglass or liftgate are open. The LGM receives inputs from the liftglass ajar switch and the sector, ratchet and pawl switches in the liftgate latch assembly to determine when an ajar condition exists. The rear wiper inhibit circuit is supplied 12 volts through a resistor and monitored within the wiper motor module. When an ajar condition exists, the LGM drives the rear wiper inhibit circuit low which the wiper motor module determines is an active inhibit signal.


Conditions for Running the DTC

Battery voltage must be between 9-16 volts.


Conditions for Setting the DTC

* DTC B396F 06 will set when the LGM detects a short to ground or an open/high resistance in the liftgate ajar switch signal circuit.
* DTC B396F 0B will set when the LGM detects a short to voltage in the liftgate ajar switch signal circuit.



Actions Taken When the DTC Sets

* When a short to ground condition exists, the rear wiper motor will operate while the liftglass or liftgate are open.
* When an open or short to voltage condition exists, the rear wiper motor will not operate.



Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* You issue a scan tool CLEAR DTCs command.



Diagnostic Aids

Whenever the LGM is disconnected or loses power, the ignition must be cycled OFF then ON.


Reference Information
Schematic Reference

Liftgate Schematics (Liftgate Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Liftgate Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)


Circuit/System Verification

Ignition ON, observe the scan tool liftgate ajar switch parameter while opening and closing the liftgate. The reading should toggle between ACTIVE and INACTIVE.


Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
2. Ignition OFF, test for less than 5.0 ohms of resistance between the low reference circuit terminal 2 and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the PLM.

3. Ignition ON, verify with a scan tool the liftgate ajar switch parameter is INACTIVE.

• If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuits test normal, replace the PLM.

4. Install a 3-amp fused jumper wire between the signal circuit terminal 6 and ground. Verify the scan tool the liftgate ajar switch parameter is ACTIVE.

• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the PLM.

5. If all circuits test normal, test or replace the liftgate latch assembly.



Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Liftgate Wiper Motor Replacement (Liftgate Wiper Motor Replacement)
* Control Module References (Programming and Relearning) for LGM replacement, setup, and programming