B1242

DTC B1242

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 Descriptor
DTC B1242
- Wireless Door Lock Tuner Circuit Malfunction

Circuit Description

The keyless entry system is a vehicle entry device. The keyless entry will unlock the vehicle doors or open the rear compartment when a corresponding button on the keyless entry transmitter is pressed. This is accomplished by the keyless entry transmitter sending a radio frequency to the remote control door lock receiver (RCDLR). The RCDLR interprets the signal and activates the requested function via a message over the serial data line to the body control module (BCM).

Conditions for Running the DTC

Ignition ON

Conditions for Setting the DTC

The BCM does not receive a signal from the RCDLR after programming has been completed.

Action Taken When the DTC Sets

Keyless entry functions are inoperative

Conditions for Clearing the DTC

The DTC will clear when conditions for setting the DTC have been repaired.

Conditions for Clearing the DTC

The DTC will clear when the conditions for setting the DTC have been corrected.

Reference Information
Schematic Reference

Remote Function Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Keyless Entry System 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 (Programming and Relearning)for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the RCDLR.
2. Test for less than 1ohm between the ground circuit terminal 1 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Verify that a test lamp illuminates between the B+ circuit terminal 5 and ground.

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

4. Disconnect the harness connector at the BCM.
5. Ignition ON, test for less than 1V between the following circuit terminals at the BCM harness connector and ground:

* Signal circuit terminal 16
* Signal circuit terminal 17

• If greater than the specified range, test the signal circuit for a short to voltage.

6. Test for infinite resistance between the following circuit terminals at the BCM harness connector and ground:

* Signal circuit terminal 16
* Signal circuit terminal 17

• If not the specified value, test the signal circuit for a short to voltage.

7. Test for less than 2ohm between the following signal circuit terminals:

* Terminal 16 at the BCM harness connector and terminal 2 at the RCDLR harness connector
* Terminal 17 at the BCM harness connector and terminal 3 at the RCDLR harness connector

• If not within the specified range, test the signal circuit for an open/high resistance.

8. If all circuits test normal, replace the RCDLR. If the DTC resets, replace the BCM.

Repair Instructions

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

Control Module References (Programming and Relearning)for BCM or RCDLR replacement, setup, and programming