For 1990-2009 cars

### 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 B3152: Lock Switch Circuit Low
DTC B3153: Lock Switch Circuit High

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Driver Door Lock and Window Switch B+ | 1, 2 | 1, 2 | -- | --
Driver Door Unlock Control | -- | 2, 3 | -- | --
All Door Lock Control | B3152 | 2, 3 | -- | --
Driver Door Lock Actuator Control | 4, 5, 6 | 4 | 4 | --
Passenger Door Lock Actuator Control | 4, 5, 6 | 5 | 5 | --
Rear Door Lock Actuator Control | 4, 5, 6 | 6 | 6 | --
Driver Door Lock and Window Switch Ground | -- | 1, 2 | 1, 2 | --
1. Driver Door Lock Switch Malfunction 2. Passenger Door Lock Switch Malfunction 3. Key Fob Malfunction 4. Driver Door Lock Malfunction 5. Passenger Door Lock Malfunction

6. Rear Door Lock Malfunction

### Circuit/System Description

The driver door lock actuator unlock control circuit is a dedicated control circuit used only for the driver door lock actuator motor. This is done so that the driver door may be unlocked by itself using a keyless entry transmitter or an automatic door unlock function, if programmed.

### Conditions for Running the DTC

Battery voltage must be between 9-16 volts.

### Conditions for Setting the DTC

#### B3152

The body control module (BCM) detects a short to ground on the door unlock control circuit for greater than 60 seconds.

#### B3153

The BCM detects a short to voltage or an open/high resistance in the door unlock control circuit for greater than 60 seconds.

### Action Taken When the DTC Sets

The doors will not lock when using the keyless entry transmitter.

### Conditions for Clearing the DTC

• | This 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.

### Reference Information

#### Schematic Reference

Door Lock/Indicator Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Power Door Locks 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

1. Ignition ON, command the Driver Door Unlock with a scan tool, the driver door should perform the UNLOCK function.
2. Command the Lock All Doors with a scan tool, all doors should perform the LOCK function.
3. Command the driver door to UNLOCK and all doors to LOCK with the keyless entry transmitter, the driver door should UNLOCK and all doors should LOCK.

⇒ | If the keyless entry transmitter is inoperative, refer to Keyless Entry System Inoperative .

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector X2 at the driver door lock switch and disconnect the harness connector at the passenger door lock switch.
2. Connect a test lamp between the control circuit terminal 7 and B+.
3. Ignition ON, command the door lock actuators to LOCK with a scan tool. The test lamp should illuminate when commanding the LOCK state.

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

⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

4. Ignition OFF, connect the harness connector at the passenger door lock switch.
5. Ignition ON, command the door lock actuators to LOCK by using the passenger door lock switch. The test lamp should illuminate during the LOCK command.

⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the passenger door lock switch.

⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the passenger door lock switch.

6. If all circuits test normal, replace the driver door lock switch.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming