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B3138



DTC B3137 or B3138

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 Initial Inspection and Diagnostic Overview.

DTC DESCRIPTORS

DTC B3137
All Door Lock Circuit Low

DTC B3133
All Door Lock Circuit High





DIAGNOSTIC FAULT INFORMATION

CIRCUIT/SYSTEM DESCRIPTION
The body control module (BCM) controls the door lock relay. Voltage is applied to the door lock relay through the door lock relay control circuit when the BCM senses a door lock switch activation of a keyless entry lock command or from the door lock switch.

CONDITIONS FOR RUNNING THE DTC
- Battery positive voltage is between 9-16 volts.
- DTC B3137 and B3138 are not current.

CONDITIONS FOR SETTING THE DTC
- The BCM detects an open in the driver door lock relay control circuit.
- The BCM detects a short to ground in the driver door lock relay control circuit while commanding the driver door lock relay.
- An open coil in the driver door lock relay.

ACTION TAKEN WHEN THE DTC SETS
- The door lock relay will be inoperative.
- The BCM stores either DTC B3137 or B3138 in memory.

CONDITIONS FOR CLEARING THE DTC
- The BCM no longer detects the fault.
- 100 consecutive ignition cycles have been recorded without the DTC being detected.
- Using a scan tool can clear the DTC.

DIAGNOSTIC AIDS
- A DTC B3137 can set if the door lock switch is engaged for more than 30 seconds.
- There is a circuit breaker found in the door lock motor. After 30 seconds of continues voltage being applied the circuit breaker will open.
- The lock motor is a bi-directional motor. When voltage and ground are reversed the motor will reverse direction.
- Both door lock circuit are normally grounded.

CIRCUIT/SYSTEM TESTING
1. Ignition OFF, disconnect the lock relay.
2. Ignition ON, verify the driver lock relay feedback is low.
- If the driver lock relay feedback is still activated, repair the relay switch control circuit for a short to voltage.
3. Verify that a test lamp illuminates between the relay coil voltage supply circuit and ground when the door locks are activated.
- If the test lamp does not illuminate, repair the voltage supply circuit for a short to ground or an open/high resistance. If the voltage supply circuit fuse is open, test or replace the relay.
4. Verify that a test lamp illuminates between the relay switch voltage supply circuit and ground.
- If the test lamp does not illuminate, repair the relay switch voltage supply circuit for a short to ground or an open/high resistance. If the relay switch voltage supply circuit fuse is open, test the relay switch control circuit for a short to ground.
5. Disconnect the harness connector at the LF door lock.
6. Test for less than 1 ohm of resistance between both circuits at the door lock motor and ground.
- If greater than 1 ohm, test the ground circuit for an open/high resistance.
7. Connect the harness connector at the driver door lock motor.
8. Connect a 10-amp fused jumper wire between the relay switch voltage supply circuit and the relay switch control circuit. Verify the driver door lock is activated.
- If the driver door lock is not activated, test the relay switch control circuit for an open/high resistance. If the circuit tests normal, test or replace the driver door lock.
9. Connect a test lamp between the relay coil control circuit and the relay coil voltage supply circuit.
10. Command the driver door lock relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- If the test lamp remains ON all the time, test for a short to ground on the relay coil control circuit. If the circuit tests normal, replace the BCM.
- If the test lamp remains OFF all the time, test for a short to voltage or an open/high resistance on the relay coil control circuit. If the circuit tests normal, replace the BCM.
11. If all circuits test normal, test or replace the driver door lock relay.

COMPONENT TESTING

Relay Test
1. Ignition OFF, disconnect the driver lock relay.
2. Test for 65-95 ohms of resistance between terminals 85 and 86.
- If the resistance is 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 infinite resistance, replace the relay.
4. Test for less than 2 ohms of resistance between terminals 30 and 87A.
- If greater than 2 ohms, replace the relay.
5. Install a 15-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Measure for less than 2 ohms of resistance between terminals 30 and 87.
- If greater than 2 ohms, replace the relay.

Lock Motor
1. Ignition OFF, disconnect the harness connector at the lock motor.
2. Test for 1-10 ohms of resistance between the control terminal and the ground terminal of the door lock motor.
- If the resistance is not within the specified range, replace the door lock motor.

REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure Verification Tests.
Control Module References for BCM replacement, setup, and programming Programming and Relearning
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