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B3135




DTC B3130 or B3135

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors
DTC B3130 00
- All Door Unlock Circuit

DTC B3135 00
- All Door Lock Circuit

Diagnostic Fault Information






Circuit/System Description

The rear passenger door locks are controlled by the body control module (BCM). When a door lock switch is operated to the lock position, the BCM applies voltage to the rear door lock actuator lock control circuit which energizes the lock relay. The BCM applies ground to the rear door lock actuator unlock control circuit which energizes the unlock relay coil.

Conditions for Running the DTC

Battery voltage is between 9-16 volts.

Conditions for Setting the DTC

B3130 00

The BCM detects a short to voltage on the rear door unlock control circuit.

B3135 00

The BCM detects a short to ground on the rear door lock control circuit.

Actions Taken When the DTC Sets

The BCM will disable all rear door unlock requests.

Conditions for Clearing the DTC

* The 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 Door Lock/Indicator Schematics
Connector End View Reference

Component Connector End Views Connector Views
Description and Operation

Power Door Latch Description and Operation Description and Operation
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

Command the rear doors to LOCK and UNLOCK with the scan tool, the rear doors should perform the LOCK and UNLOCK function.

If B3130 00 is current, refer to UNLCK Relay Control Circuit Malfunction.
If B3135 00 is current, refer to LCK Relay Control Circuit Malfunction

Circuit/System Testing

UNLCK Relay Control Circuit Malfunction
1. Ignition OFF, disconnect the UNLCK relay.
2. Connect a test lamp between the control circuit terminal 85 and the B+ circuit terminal 86.
3. Command the rear doors to UNLOCK with a scan tool. The test lamp should briefly illuminate when commanding the UNLOCK state.

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

4. If all circuits test normal, test or replace the UNLCK relay.

LCK Relay Control Circuit Malfunction
1. Ignition OFF, disconnect the LCK relay.
2. Connect a test lamp between the control circuit terminal 85 and the ground circuit terminal 86.
3. Command the rear doors to LOCK with a scan tool. The test lamp should briefly illuminate when commanding the LOCK state.

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

4. If all circuits test normal, test or replace the LCK relay.

Component Testing

Relay Test
1. Ignition OFF, disconnect the appropriate relay.
2. Test for 60-200 ohms between terminals 85 and 86.

If 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 the specified value, replace the relay.

4. Test for less than 2 ohms between terminals 30 and 87A.

If greater than the specified range, replace the relay.

5. Install a 3A fused jumper wire between the relay terminal 85 and 12V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.

If greater than specified range, replace the relay.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)
* Control Module References Control Module References for BCM replacement, setup, and programming