Service Information

Orlando

DTC B3125, B3130, or B3135

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 B3125 01: Driver Door Only Unlock Circuit Short to Battery

DTC B3125 02: Driver Door Only Unlock Circuit Short to Ground

DTC B3125 04: Driver Door Only Unlock Circuit Open

DTC B3130 01: All Doors Unlock Circuit Short to Battery

DTC B3130 02: All Doors Unlock Circuit Short to Ground

DTC B3130 04: All Doors Unlock Circuit Short Open

DTC B3135 01: All Doors Lock Circuit Short to Battery

DTC B3135 02: All Doors Lock Circuit Short to Ground

DTC B3135 04: All Doors Lock Circuit Open

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
BCM B+	B3125 02, B3130 02, B3135 02	B3125 02, B3130 02, B3135 02	--	--
Door Catch Control	B3125 02, B3130 02, B3135 02	B3125 04, B3130 04, B3135 04	B3125 01, B3130 01, B3135 01	-
Driver Door Lock Motor Lock Control	B3125 02, B3130 02, B3135 02	B3125 04, B3130 04, B3135 04	B3125 01, B3130 01, B3135 01	-
Door Lock Actuator Unlock Control	B3125 02, B3130 02, B3135 02	B3125 04, B3130 04, B3135 04	B3125 01, B3130 01, B3135 01	-

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.

Conditions for Running the DTC

Ignition ON

Conditions for Setting the DTC

B3125 01, B3130 01, B3135 01

The BCM detects a short to battery on a door latch control circuit

B3125 02, B3130 02 and B3135 02

•	A short to ground or an open/high resistance in the BCM B+ circuit.

•	The BCM detects a short to ground on a door latch control circuit.

B3125 04, B3130 04, B3135 04

The BCM detects an open/high resistance on a door latch control circuit

Action Taken When the DTC Sets

All the central locking units will be inoperative.

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

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 doors to LOCK and UNLOCK by using the driver door lock switch, all the doors should LOCK and UNLOCK when changing between the commanded states.

⇒	If the driver door does not LOCK or UNLOCK, refer to Driver Door Lock Malfunction.

⇒	If one or more passenger doors do not LOCK or UNLOCK, refer to Passenger Door Lock Malfunction.

⇒	If all doors do not LOCK and UNLOCK, refer to All Door Locks Inoperative.

Circuit/System Testing

Driver Door Lock Malfunction

Ignition OFF, disconnect the harness connector at the A23D door latch assembly-driver.
Connect a test lamp between the control circuit terminal 2 and the control circuit terminal 3
Command the driver door latch to LOCK and UNLOCK with a scan tool, the test lamp should illuminate when commanding the LOCK and UNLOCK states.

⇒	If the test lamp is OFF during either of the LOCK and UNLOCK commands, test the control circuit for an open/high resistance. If the circuits test normal, replace the K9 BCM

⇒	If the test lamp is always ON, test the control circuit for a short to voltage. If the circuits test normal, replace the K9 BCM

If all circuits test normal, test or replace the A23D door latch assembly-driver

Passenger Door Locks Malfunction

Ignition OFF, disconnect the wiring harness plug at the appropriate A23 door latch assembly.
Connect a test lamp between the control circuit terminals listed below:

•	A23P door latch assembly-passenger control circuit terminal 7 and control circuit terminal 8

•	A23RR door latch assembly-right rear control circuit terminal 7 and control circuit terminal 8

•	A23LR door latch assembly-left rear control circuit terminal 2 and control circuit terminal 3

Command the door to LOCK and UNLOCK with a scan tool, the test lamp should illuminate when commanding the LOCK and UNLOCK states.

⇒	If the test lamp is OFF during either of the LOCK and UNLOCK commands, test either control circuit for an open/high resistance. If the circuits test normal, replace the K9 BCM

⇒	If the test lamp always ON , test either control circuit for a short to voltage. If the circuits test normal, replace the K9 BCM

If all circuits test normal, test or replace the A23 door latch assembly

All Door Locks Inoperative

Ignition OFF, disconnect the X2 harness connector at the K9 BCM.
Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

Ignition OFF, connect the X2 harness connector and disconnect the X6 harness connector at the K9 BCM.
Test for infinite resistance between each control circuit listed below and ground:

•	Control circuit terminal 1

•	Control circuit terminal 2

•	Control circuit terminal 4

⇒	If not the specified value, disconnect the A23 door latch assemblies and test each control circuit for a short to ground. If the circuits test normal, test for an internally shorted A23 door latch assembly.

If all circuits test normal, replace the K9 BCM.

Component Testing

Ignition OFF, disconnect the wiring harness plug at the appropriate A23 door latch assembly.
Install a 25 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the A23 door latch assembly should perform the LOCK and UNLOCK functions.

⇒	If it does not perform as specified, replace the A23 door latch assembly.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Front Side Door Catch Replacement

•	Rear Side Door Catch Replacement

•	Control Module References for BCM replacement, programming and setup