Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | 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 OpenDTC B396F 0B: Liftglass Ajar Output Signal Circuit Current Above Threshold
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Latch Pawl Switch Signal | B153A 08 | B153A 08 | 1 | -- |
Latch Ratchet Switch Signal | B153A 08 | B153A 08 | 1 | -- |
Latch Sector Switch Signal | B153A 08 | B153A 08 | 1 | -- |
Liftgate Ajar Switch Signal | B396F 06 | B396F 06 | B396F 0B | -- |
Liftgate Latch Motor Close Control | B2495 02 | B2495 04 | B2495 01 | -- |
Liftgate Latch Motor Open Control | B2495 02 | B2495 04 | B2495 01 | -- |
Liftgate Motor Close Control | B396A 02 | B396A 04 | B396A 01 | -- |
Liftgate Motor Disengage Control | B396B 02 | B396B 04 | B396B 01 | -- |
Liftgate Motor Engage Control | B396B 02 | B396B 04 | B396B 01 | -- |
Liftgate Motor Open Control | B396A 02 | B396A 04 | B396A 01 | -- |
Liftgate Position Sensor Reference Voltage | B153E 02 | B153E 05 | B153E 05 | -- |
Liftgate Position Sensor Signal 1 | B153E 08 | B153E 08 | B153E 08 | -- |
Liftgate Position Sensor Signal 2 | B153E 08 | B153E 08 | B153E 08 | -- |
Liftgate Tape Switch Signal | B153F 02 | B153F 05 | B153F 05 | -- |
Liftgate Full Open Switch Signal | B153B 02 | B153B 05 | B153B 05 | -- |
Open/Close Switch Signal | B2494 02 | 1 | 1 | -- |
Liftgate Full Open Switch Low Reference | -- | B153A 08 | -- | -- |
Liftgate Handle Switch Low Reference | -- | 1 | -- | -- |
Liftgate Position Sensor Low Reference | -- | 1 | -- | -- |
Liftgate Tape Switch Low Reference | -- | B153F 05 | -- | -- |
1. Power Liftgate Malfunction | ||||
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
Connector End View Reference
Description and Operation
Liftgate Description and Operation
Electrical Information Reference
Scan Tool Reference
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
- Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
- Ignition OFF, test for less than 5.0 ohms of resistance between the low reference circuit terminal 2 and ground.
- Ignition ON, verify with a scan tool the liftgate ajar switch parameter is INACTIVE.
- 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 all circuits test normal, test or replace the liftgate latch assembly.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the PLM. |
| ⇒ | If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuits test normal, replace the PLM. |
| ⇒ | 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. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for LGM replacement, setup, and programming |
