Keyless Entry System Inoperative

Keyless Entry System Inoperative

Diagnostic Fault Information

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

Circuit/System Description

The keyless entry system is a vehicle entry device. The keyless entry will unlock/unlatch the vehicle doors when a corresponding button on the key fob is pressed. This is accomplished by the key fob sending a radio frequency to the body control module (BCM). The signal is received by the BCM via an internal antenna. A low transmitter battery or radio frequency (RF) interference from aftermarket devices such as 2-way radios, power inverters, cellular phone chargers, computers, etc. may cause a system malfunction. High RF traffic areas, such as gas stations which use pay-at-the-pump RF transponders, may also cause interference that could lead to a malfunction.

Diagnostic Aids

For the J 43241 Keyless Entry Tester, inspect the keyless entry transmitter part number to determine that it is the correct model for the vehicle. A wrong model transmitter may pass the test, but it will not activate the vehicle remote system.

Circuit/System Testing

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

• If not the correct transmitter, replace the transmitter.

2. Ignition ON, press each button on the transmitter. Verify that all of the scan tool Remote Command parameters change state when each button is pressed.

• If one or more of the parameters do not change state, reprogram the transmitter. If it still does not operate, replace the transmitter.

3. If the transmitter functions normally, replace the BCM.

Repair Instructions

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

* Transmitter Programming for transmitter programming
* Refer to Programing and Relearning for BCM replacement, setup, and programming. Programming and Relearning