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 Instructionsprovides an overview of each diagnostic category.

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Door Lock Switch Signal | 1, 4 | 1, 4 | 1, 4 | --
Door Unlock Switch Signal | 2, 3, 4 | 2, 3, 4 | 2, 3, 4 | --
Driver Door Unlock Control | B3125 02 | B3125 04 | B3125 01 | --
Doors Lock Control | B3135 02, 4 | B3135 04, 4 | B3135 01, 4 | --
Passenger Doors Unlock Control | B3130 02 | B3130 04 | B3130 01 | --
Door Lock Switch Ground | -- | 1, 2, 3, 4 | 1, 2, 3, 4 | --
1. Door Lock Malfunction 2. Driver Door Unlock Malfunction 3. Door Unlock Malfunction 4. Fuel Filler Door Release Inoperative

### Circuit/System Description

The body control module (BCM) controls the door lock, passenger door unlock and driver door unlock circuits. Voltage is applied to the appropriate circuit when the BCM senses a door lock/unlock switch activation or a keyless entry lock or unlock command.

### 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

### Circuit/System Verification

1. Ignition ON, observe the scan tool Driver Door Lock Switch, Passenger Door Lock Switch, Driver Door Unlock Switch and Passenger Door Unlock Switch parameters while using the door lock switch. The parameter should change between Inactive and Active.

⇒ | If the value does not change between commanded states, refer to Door Lock Switch Malfunction.

2. Command the driver door and passenger door lock actuators to Lock and Unlock with the scan tool, the doors should lock and unlock.

⇒ | If the driver door does not unlock, refer to Driver Door Unlock Circuit Malfunction.

⇒ | If one or more passenger doors do not unlock, refer to Door Unlock Circuit Malfunction.

⇒ | If one or more vehicle doors do not lock, refer to Door Lock Circuit Malfunction.

3. Command the door deadbolt actuators to Lock and Unlock with the scan tool, the doors deadbolt actuators should lock and unlock.

⇒ | If one or more doors do not unlock, refer to Door Deadlock Circuit Malfunction.

### Circuit/System Testing

#### Door Lock Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the S13D Door Lock Switch - Driver.
2. Test for less than 1 Ω between the ground circuit terminal 1 and ground.

⇒ | If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool Door Lock Switch parameter is Inactive.

⇒ | If not the specified parameter, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the K9 Body Control Module (BCM).

4. Verify the scan tool Door Unlock Switch parameter is Inactive.

⇒ | If not the specified parameter, test the signal circuit terminal 3 for a short to ground. If the circuit tests normal, replace the K9 Body Control Module (BCM)

5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and ground. Verify the scan tool Door Unlock Switch parameter is Active.

⇒ | If not the specified parameter, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module (BCM)

6. Install a 3 A fused jumper wire between the signal circuit terminal 4 and ground. Verify the scan tool Door Lock Switch parameter is Active.

⇒ | If not the specified parameter, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module (BCM).

7. If all circuits test normal, test or replace the S13D Door Lock Switch - Driver.

#### Driver Door Unlock Circuit Malfunction

1. Ignition OFF, disconnect the A23D Door Latch Assembly - Driver.
2. Connect a test lamp between the driver door unlock control circuit terminal 3 and ground.

⇒ | If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module (BCM).

3. Test for less than 30 Ω between the driver door unlock and lock control circuit terminal 2 and 3.

⇒ | If greater than the specified range, test the driver door unlock and lock circuits for an open/high resistance. If both circuits test normal, replace the K9 Body Control Module (BCM).

4. If all circuits test normal, test or replace the A23D Door Latch Assembly - Driver.

#### Door Unlock Circuit Malfunction

1. Ignition OFF, disconnect the inoperative door latch.
2. Connect a test lamp between the door unlock control circuit listed and ground.

• | A23P Door Latch Assembly - Passenger terminal 8

• | A23LR Door Latch Assembly - Left Rear terminal 3

• | A23RR Door Latch Assembly - Right Rear terminal 8

⇒ | If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module (BCM).

3. Test for less than 30 Ω between the door unlock and lock control circuit terminals listed.

• | A23P Door Latch Assembly - Passenger terminal 7 and 8

• | A23LR Door Latch Assembly - Left Rear terminal 2 and 3

• | A23RR Door Latch Assembly - Right Rear terminal 7 and 8

⇒ | If greater than the specified range, test the passenger door unlock and lock circuits for an open/high resistance. If both circuits test normal, replace the K9 Body Control Module (BCM).

4. If all circuits test normal, test or replace the inoperative door latch.

#### Door Lock Circuit Malfunction

1. Ignition OFF, disconnect the inoperative door latch.
2. Test for less than 20 Ω between the door lock control circuit listed and ground.

• | A23D Door Latch Assembly - Driver terminal 2

• | A23D Door Latch Assembly - Driver terminal 3

• | A23P Door Latch Assembly - Passenger terminal 7

• | A23P Door Latch Assembly - Passenger terminal 8

• | A23LR Door Latch Assembly - Left Rear terminal 2

• | A23LR Door Latch Assembly - Left Rear terminal 3

• | A23RR Door Latch Assembly - Right Rear terminal 7

• | A23RR Door Latch Assembly - Right Rear terminal 8

⇒ | 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 K9 Body Control Module (BCM).

3. Connect a test lamp between the door lock control circuit listed.

• | A23D Door Latch Assembly - Driver terminal 2 and 3

• | A23P Door Latch Assembly - Passenger terminal 7 and 8

• | A23LR Door Latch Assembly - Left Rear terminal 2 and 3

• | A23RR Door Latch Assembly - Right Rear terminal 7 and 8

4. Ignition ON, command the doors to Lock and Unlock with a scan tool. The test lamp should briefly illuminate while commanding the Lock and Unlock states

⇒ | If the test lamp remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuits test normal, replace the K9 Body Control Module (BCM).

5. If all circuits test normal, test or replace the inoperative door latch.

### Component Testing

#### Door Lock Switch Test

1. Ignition OFF, disconnect the harness connector at the S13D Door Lock Switch - Driver.
2. Test for infinite resistance between the signal terminals 3 and 4 and the ground terminal 1with the switch in the open position.

⇒ | If less than the specified value, replace the S13D Door Lock Switch - Driver.

3. Test for less than 2 Ω between the signal terminal 4 and the ground terminal 1 with the switch in the lock position.

⇒ | If greater than the specified value, replace the S13D Door Lock Switch - Driver.

4. Test for less than 2 Ω between the signal terminal 3 and the ground terminal 1 with the switch in the unlock position.

⇒ | If greater than the specified value, replace the S13D Door Lock Switch - Driver.

#### Door Latch Assembly

1. Ignition OFF, disconnect the harness connector at the appropriate door lock assembly.
2. Install a 25 A fused jumper wire between the lock control terminal and 12 V. Momentarily install a jumper wire between the unlock control terminal and ground. The door lock should perform the Lock/ Unlock function.

⇒ | If the function does not perform as specified, replace the door lock.

3. Reverse the jumper wires; the appropriate door lock should perform the Unlock/Lock function.

⇒ | If the function does not perform as specified, replace the door lock.

### Repair Instructions

Perform the Diagnostic Repair Verificationafter completing the diagnostic procedure.

• | Door Lock Switch Replacement

• | Front Side Door Lock Replacement

• | Rear Door Lock Replacement

• | Control Module Referencesfor BCM replacement, setup, and programming