For 1990-2009 cars

## DTC B2495 Manual Liftgate

### 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 Battery
DTC B2495 02: Liftgate Latch Control Circuit Short to Ground

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Liftgate Relay Switch B+ | 2 | 2 | -- | --
Liftgate Release Switch Signal | B2494 00 | B2494 00 | B2494 00 | --
Liftgate Relay Low Reference | -- | 2 | B3265 00 | --
Liftgate Relay Coil Control | B2495 02 | 2 | B2495 01 | --
Liftgate Latch Control | -- | 2 | 2 | --
Liftgate Latch Ground | -- | 2 | 2 | --
Liftgate Switch Ground | -- | 1 | 1 | --
1. Liftgate Release Switch Malfunction 2. Liftgate Release Malfunction

### Circuit/System Description

The body control module (BCM) provides voltage to the liftgate release relay control circuit thus energizing the L/GATE relay which provides voltage to the liftgate latch assembly releasing the liftgate.

### Conditions for Running the DTC

The system voltage is 9-18 volts.

### Conditions for Setting the DTC

#### B2495 01

The BCM detects a short to voltage in the liftgate latch relay supply voltage circuit.

#### B2495 02

The BCM detects a short to ground in the liftgate latch relay supply voltage circuit.

### Action Taken When the DTC Sets

• | The BCM stores the DTC to memory.

• | The liftgate latch will malfunction.

### 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

Before testing can be performed the liftgate must be opened. Refer to Opening the Liftgate Without Electrical Power for the appropriate procedure.

### Reference Information

#### Schematic Reference

Release Systems Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Rear Hatch/Gate Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Command the liftgate latch to release by pressing the exterior liftgate switch. The liftgate latch assembly should release the liftgate.

### Circuit/System Testing

1. Ignition OFF, disconnect the L/GATE relay.
2. Connect a test lamp between the control circuit terminal 85 and ground.
3. Command the liftgate latch assembly by pressing and releasing the exterior liftgate switch. The test lamp should turn ON and OFF when changing between the commanded states.

⇒ | 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 BCM.

⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.

4. If all circuits test normal, test or replace the L/GATE relay.

### Component Testing

1. Ignition OFF, disconnect the L/GATE relay.
2. Test for 60-200 ohms between terminals 85 and 86.

⇒ | If not within the specified range, replace the relay.

3. Test for infinite resistance between the following terminals:

• | 30 and 86

• | 30 and 87

• | 30 and 85

• | 85 and 87

⇒ | If less than the specified value, replace the L/GATE relay.

4. Install a 3-amp fused jumper wire between applicable relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.

⇒ | If greater than the specified range, replace the L/GATE relay.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Relay Replacement

• | Control Module References for BCM replacement, setup and programming

## DTC B2495 Power Liftgate

### 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: Endgate/Liftgate Latch Control Circuit Short to Battery
DTC B2495 02: Endgate/Liftgate Latch Control Circuit Short to Ground
DTC B2495 04: Endgate/Liftgate Latch Control Circuit Open Circuit

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Liftgate Module B+ | B153A 08, B396A 02 | B153A 08, B396A 02 | -- | --
Liftgate Module B+ | U0230 00 | U0230 00 | -- | --
Liftgate Position Sensor 5V Reference Voltage | B153E 02 | B153E 08 | 2 | B1019 00
Full Open Signal | B153E 08 | B153B 05 | 2 | --
Liftgate Disable Signal | 1, 2 | 1 | 1 | --
Liftgate Open Signal | 1 | 1 | 1 | --
Object Sensors Signal | B153F 05 | B153F 05 | B153F 07 | --
Open/Close Switches Signal | B2494 02 | 1, 2 | 1, 2 | --
Pawl Switch Signal | B153A 00 | B153A 08 | B153A 00 | B153A 08
Position Sensor Signal 1 | B153E 08 | B153E 08 | B153E 05 | --
Position Sensor Signal 2 | B153E 02 | B153A 08 | B153E 05 | B153E 08
Ratchet Switch Signal | B153A 00 | B153A 08 | 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 | B153E 08
Liftgate Motor Open Control | B396A 02 | B396A 04 | B396A 01 | B153E 08
Full Open Low Reference | -- | B153B 05 | 2 | --
Liftgate Switches Low Reference | -- | B153A 08 | 2 | B153E 08
Position Sensor Low Reference | -- | B153E 08 | 2 | --
I/P Switch Ground | -- | 1 | 1 | --
Liftgate Control Module Ground | -- | U0230 00 | 2 | --
1. Liftgate Switch Malfunction 2. Liftgate Malfunction

### Circuit/System Description

The latch motor is a bi-directional motor and cinch or unlatch operation is the result of the direction of the motor rotation. The liftgate module (LGM) controls the latch motor through the control circuits by supplying power and ground in the appropriate polarity. The motor control circuits are monitored by the LGM prior to activation for a high or low condition and during motor operation for an insufficient current flow condition.

### Conditions for Running the DTC

The system voltage is 9-16 volts.

### 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

Liftgate Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Rear Hatch/Gate Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Ignition ON, command the liftgate to OPEN with the scan tool, the liftgate should perform the power OPEN function.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
2. Test for less than 5 ohms between the control circuit terminal 1 and ground

⇒ | 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.

3. Test for less than 5 ohms between the control circuit terminal 3 and ground.

⇒ | 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.

4. Connect a test lamp between control circuit terminal 1 and ground.
5. 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.

⇒ | 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.

6. Ignition OFF, connect a test lamp between the control circuit terminal 3 and ground.
7. Connect a 3A fused jumper wire between the signal circuit terminal 6 and ground.
8. 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 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.

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

### Component Testing

1. Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
2. 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.

⇒ | If the function does not perform as specified, replace the liftgate latch assembly.

3. 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.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Control Module References for LGM replacement, setup and programming

• | Liftgate Actuator Replacement