Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

When a keyless entry transmitter button is pressed, an RF signal is sent to the vehicle. The remote control door lock receiver (RCDLR) receives this RF signal by way of the keyless entry/tire pressure antenna. When the RF signal is received, the RCDLR determines the specific command sent by the transmitter and will relay this message to the body control module (BCM) via serial data. The BCM will then perform the command.

Schematic Reference

Keyless Entry Schematics

Connector End View Reference

Keyless Entry Connector End Views

Electrical Information Reference

Scan Tool Reference

Scan Tool Data List

Scan Tool Data Definitions

Special Tools Required

J 43241 Keyless Entry Tester

1. Verify that the transmitter being used is a 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 button of the transmitter one at a time. The tester should sound a tone and illuminate a green light when each button is pressed.

⇒	If any of the buttons do not sound the tone and illuminate the green light, replace the transmitter battery. Retest with the J 43241. If the transmitter continues to malfunction, replace the affected transmitter.

3. Verify the scan tool Fob Programmed parameter for the transmitter being used is Yes.

⇒	If not the specified value, program the applicable transmitter.

4. Press each transmitter button. Verify the scan tool Fob Function parameter for the transmitter being used responds to each button press.

⇒	If the parameter does not respond, test the keyless entry antenna for an open/high resistance. If all circuits test normal, replace the RCDLR.

5. If all circuits test normal, test or replace the RCDLR.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Transmitter Battery Replacement

Transmitter Programming

Control Module References for RCDLR replacement, setup, and programming.