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 |
|---|---|---|---|---|
Liftgate Module B+ | B396A 02, B153A 08 | B396A 02, B153A 08 | -- | -- |
Liftgate Position Sensor 5V Reference Voltage | 2 | B153E 08 | 2 | -- |
Full Open Signal | B153B 02 | 2 | 2 | -- |
Liftgate Disable Signal | 1, 2 | 1 | 1 | -- |
Liftgate Open Signal | 1 | 1 | 1 | -- |
Object Sensors Signal | B153F 02 | B153F 05 | B153F 05 | B153F 03, B153F 07 |
Open/Close Switches Signal | B2494 02 | 1, 2 | 1, 2 | -- |
Pawl Switch Signal | B153A 00 | B153A 00 | B153A 00 | B153A 08 |
Position Sensor Signal 1 | B153E 02 | B153E 05, B153E 08 | B153E 05 | -- |
Position Sensor Signal 2 | B153E 02 | B153E 05, B153E 08 | B153E 05 | -- |
Ratchet Switch Signal | B153A 00 | B153A 00 | B153A 00 | B153A 08 |
Sector Switch Signal | B153A 00 | B153A 00 | B153A 00 | B153A 08 |
Disengage Clutch Control | B396B 02 | B396B 04 | B396B 01 | -- |
Engage Clutch Control | B396B 02 | B396B 04 | B396B 01 | -- |
Liftgate Latch Cinch Control | B2495 02 | B2495 04 | B2495 01 | -- |
Liftgate Latch Release Control | B2495 02 | B2495 04 | B2495 01 | -- |
Liftgate Motor Close Control | B396A 02 | B396A 04 | B396A 01 | -- |
Liftgate Motor Open Control | B396A 02 | B396A 04 | B396A 01 | -- |
Full Open Low Reference | -- | 2 | 2 | -- |
Liftgate Switches Low Reference | -- | 1 | 1 | -- |
Position Sensor Low Reference | -- | B0153E 08 | 2 | -- |
I/P Switch Ground | -- | 1 | 1 | -- |
Liftgate Control Module Ground | -- | 2 | 2 | -- |
1. Liftgate Switch Malfunction 2. Liftgate Malfunction | ||||
Circuit/System Description
The latch motor is a bi-directional motor and latch or unlatch operation is the result of the direction of the motor rotation. The liftgate control module controls the latch motor through the control circuits by suppling power and ground in the appropriate polarity. The motor control circuits are monitored by the liftgate control module prior to activation for a high or low condition and during motor operation for an insufficient current flow condition.
Conditions for Running the DTC
| • | System voltage to the liftgate control module must be 9-16 volts. |
| • | Power open or close function is initiated. |
Conditions for Setting the DTC
B2495 01
The LGM detects a short to voltage in the liftgate latch motor open control circuit or the liftgate latch motor close control circuit.
B2495 02
The LGM detects a short to ground in the liftgate latch motor open control circuit or the liftgate latch motor close control circuit.
B2495 04
The LGM detects an open/high resistance in the liftgate latch motor open control circuit or the liftgate latch motor close control circuit.
Action Taken When the DTC Sets
The liftgate will be inoperative in the power and manual modes
Conditions for Clearing the DTC
| • | The DTC will be current for as long as the fault is present. |
| • | When the fault is no longer present, the DTC will be a history DTC. |
| • | A history DTC will clear after 50 ignition cycles. |
Diagnostic Aids
Important: Before testing can be performed the liftgate must be opened. Refer to Opening the Liftgate Without Electrical Power for the appropriate procedure.
Whenever the LGM loses power or is disconnected, the ignition must be cycled OFF then ON in order to reactivate the LGM.
Reference Information
Schematic Reference
Connector End View Reference
Vehicle Access Connector End Views
Description and Operation
Rear Hatch/Gate Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Ignition ON, command the liftgate to OPEN and CLOSE with the scan tool. The liftgate latch assembly should release the liftgate allowing the liftgate to open.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
- Test for less than 5 ohms between the control circuit terminal 1 and ground.
- Test for less than 5 ohms between the control circuit terminal 3 and ground.
- Connect a test lamp between control circuit terminal 1 and ground.
- Ignition ON, command the liftgate to OPEN by pressing and releasing the liftgate interior switch. The test lamp should illuminate while commanding the OPEN state.
- Ignition OFF, connect a test lamp between the control circuit terminal 3 and ground.
- Connect a 3A fused jumper wire between the signal circuit terminal 6 and ground.
- Ignition ON, command the liftgate to CLOSE by pressing and releasing the liftgate interior switch. The test lamp should illuminate while commanding the CLOSE state.
- 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 circuits test 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 circuits test normal, replace the LGM. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the LGM. |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to voltage, if the circuit tests normal, replace the LGM. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the LGM. |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to voltage, if the circuit tests normal, replace the LGM. |
Component Testing
- Install a 20A fused jumper wire between the control terminal 1 and 12 volts. Momentarily install a jumper wire between the control terminal 3 and ground. The liftgate latch assembly should perform the CINCH or RELEASE function.
- Reverse the jumper wires; the liftgate latch assembly should perform the RELEASE or CINCH function.
| ⇒ | If the function does not perform as specified, replace the liftgate latch assembly. |
| ⇒ | If the function does not perform as specified, replace the liftgate latch assembly. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for liftgate control module replacement, programming and setup
