B396F

DTC B396F

Diagnostic Instructions

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

Circuit/System Testing

1. Ignition OFF, disconnect the C1 harness connectors at the LGM.
2. Ignition ON, verify that B+ is present at the liftgate ajar switch signal circuit terminal 5.

• If B+ is not present, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the rear wiper motor.

3. Ignition OFF, disconnect the harness connector at the rear wiper motor.
4. Ignition ON, verify that voltage is not present at the liftgate ajar switch signal circuit terminal 5 at the LGM C1 harness connector.

• If voltage is present, test the signal circuit for a short to voltage.

5. If all circuits test normal, replace the LGM.

Repair Instructions

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

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