B3132

DTC B3132 or B3133

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 B3132
All Door Unlock Circuit Low

DTC B3133
All Door Unlock Circuit High





DIAGNOSTIC FAULT INFORMATION

CIRCUIT/SYSTEM TESTING
1. Ignition OFF, disconnect the unlock relay.
2. Ignition ON, verify the passenger unlock relay feedback is low.
- If the passenger unlock 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.
- 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 when the door unlock is activated.
- 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 RF 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 passenger 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 passenger door unlock is activated.
- If the passenger door unlock is not activated, test the relay switch control circuit for an open/high resistance. If the circuit tests normal, test or replace the passenger door lock.
9. Connect a test lamp between the relay coil control circuit and the relay coil voltage supply circuit.
10. Command the passenger door unlock 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 passenger door unlock relay.

COMPONENT TESTING

Relay Test
1. Ignition OFF, disconnect the passenger unlock 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