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Keyless Entry System Malfunction

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 keyless entry control module. The keyless entry control module interprets the signal and activates the requested function. 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.

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.

Special Tools

J-43241 Keyless Entry Tester

For equivalent regional tools, refer to Special Tools .

Note: The diagnostic assumes the transmitter worked with the vehicle at one time.

1. Place the transmitter on the J-43241 keyless entry tester test pad 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 do not function, replace the transmitter battery and retest with the J-43241. If the condition continues after battery replacement, replace the transmitter.

2. Operate the transmitter function while observing the vehicle. The vehicle should perform each of the corresponding functions selected on the transmitter.

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If any function does not work, program the keyless entry transmitter, refer to Remote Control Door Lock Receiver Aerial Replacement . If any function still does not work after reprogramming, replace the transmitter. If any function still does not work after replacing the transmitter, replace the keyless entry control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.