Keyless Entry System Inoperative

Keyless Entry System Inoperative

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.

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).

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
Special Tools

J 43241 Keyless Enter Tester

Circuit/System Verification

1. Verify that the transmitter is the correct transmitter for the vehicle.

• If not the correct transmitter, replace the transmitter.

2. Place the transmitter on the test pad of the J 43241 and press each transmitter button one at a time. The tester should sound a tone and illuminate a green light with each button press.

• If one or more buttons does not sound the tone and illuminate the green light, replace the transmitter battery and retest with the J 43241 . If the condition continues after battery replacement, replace the transmitter.

3. Enter transmitter programming in the Confirmation Mode. Refer to Remote Control Door Lock Transmitter Programming (Testing and Inspection). The response should indicate at least one transmitter is programmed to the vehicle.

• If no response is received, attempt to program a transmitter using the Add Mode. If unable to program a transmitter, refer to Circuit/System Testing.

Circuit/System Testing

1. Verify that the transmitter is the correct transmitter for the vehicle.

• If not the correct transmitter, replace the transmitter.

2. Place the transmitter on the test pad of the J 43241 and press each transmitter button one at a time. The tester should sound a tone and illuminate a green light with each button press.

• If one or more buttons does not sound the tone and illuminate the green light, replace the transmitter battery and retest with the J 43241 . If the condition continues after battery replacement, replace the transmitter.

3. Ignition OFF, disconnect the harness connector at the RCDLR.
4. 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.

5. 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.

6. Disconnect the harness connector at the BCM.
7. 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.

8. 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.

9. 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.

10. 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