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DTC 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 Descriptor

DTC B3135: All Door Lock Circuit

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Door Lock Relay B+

2

2

--

--

Door Lock Relay Control

B3135

2

2

--

I/P Fuse Block Ground

--

1, 2

--

--

1. Door Unlock Function Inoperative

2. Door Lock Function Inoperative

Circuit/System Description

When the BCM receives a command to lock the doors, the BCM will briefly provide voltage to the DOOR LOCK relay. The DOOR LOCK relay will then become energised and will supply B+ voltage to the door latches.

Conditions for Running the DTC
    • The system voltage is 9-16 volts.
    • When the BCM actively commands the DOOR LOCK relay

Conditions for Setting the DTC

The BCM detects a short to ground on the DOOR LOCK relay control circuit.

Action Taken When the DTC Sets

The door latches will malfunction.

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

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 for scan tool information

Circuit/System Verification

Ignition ON, command the Lock Rear Doors with a scan tool. The doors should perform the LOCK function.

Circuit/System Testing
  1. Ignition OFF, disconnect the DOOR LOCK relay.
  2. Connect a test lamp between the control circuit terminal 85 and the ground circuit terminal 86.
  3. Command the Lock Rear Doors with a scan tool. The test lamp should briefly illuminate when commanding the LOCK state.
    4. ⇒If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM
    ⇒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.
  4. If the circuit tests normal, test or replace the DOOR LOCK relay.

Component Testing
  1. Ignition OFF, disconnect the DOOR LOCK relay.
  2. Test for 60-200 Ω between terminals 85 and 86.
    3. ⇒If not within the specified range, replace the relay.
  3. Test for infinite resistance between the following terminals:
    4. • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87
    ⇒If not the specified value, replace the DOOR LOCK relay.
  4. Test for less than 2 Ω between terminals 30 and 87A.
    5. ⇒If greater than the specified range, replace the DOOR LOCK relay.
  5. Install a 3A fused jumper wire between relay terminal 85 and 12V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 Ω between terminals 30 and 87.
    6. ⇒If greater than the specified range, replace the DOOR LOCK relay.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Relay Replacement : Within an Electrical Center → Attached to Wire Harness
    • Control Module References for BCM replacement, setup and programming
   


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