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 B2495 01: Liftgate Latch Control Circuit Short to BatteryDTC B2495 02: Liftgate Latch Control Circuit Short to Ground
DTC B2495 04: Liftgate Latch Control Circuit Open
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 power liftgate latch assembly contains a cinch/release motor as well as 3 sector switches that provide inputs to the liftgate module (LGM) with regards to the position of the liftgate during opening and closing. When the sector switches determine that liftgate is fully latched, the LGM applies voltage and ground to the cinch/release motor to close and secure the liftgate.
The liftgate latch is also used to release the liftgate. When the LGM receives a request to release the liftgate, the LGM will respond by applying voltage and ground to the cinch/release motor by reversing the polarity. This releases the cinch/release motor, releasing the liftgate and allowing the liftgate motor to begin opening the assembly. For more detailed information concerning power liftgate operation refer to Liftgate Description and Operation .
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
| • | DTC B2495 01 will set when the LGM detects a short to voltage in the liftgate latch motor open control circuit or the liftgate latch motor close control circuit. |
| • | DTC B2495 02 will set when the LGM detects a short to ground in the liftgate latch motor open control circuit or the liftgate latch motor close control circuit. |
| • | DTC B2495 04 will set when the LGM detects an open/high resistance in the liftgate latch motor open control circuit or the liftgate latch motor close control circuit. |
Actions Taken When the DTC Sets
| • | If the liftgate is in motion when the DTC sets, liftgate operation will be disabled and resort to manual operation. |
| • | If the liftgate is not in motion when the DTC sets, all liftgate functions will be disabled. |
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
Vehicle Access Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Ignition OFF, disconnect the harness connectors at the liftgate latch assembly.
- Ignition OFF, test for less than 1 ohm of resistance between the control circuit terminal 1 and ground.
- Ignition OFF, test for less than 1 ohm of resistance between the control circuit terminal 3 and ground.
- Disconnect the C2 harness connector at the LGM.
- Verify that a test lamp does not illuminate between B+ and liftgate latch motor open control circuit terminal 1.
- Verify that a test lamp does not illuminate between B+ and liftgate latch motor close control circuit terminal 2.
- If all circuits test normal, test or replace the liftgate latch assembly.
| ⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the LGM. |
| ⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the LGM. |
| ⇒ | If the test lamp illuminates, test the control circuit for a short to ground. |
| ⇒ | If the test lamp illuminates, test the control circuit for a short to ground. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for LGM replacement, setup, and programming |
