The keyless entry system is a vehicle entry device. The keyless entry will unlock the vehicle doors when a corresponding button on the keyless entry transmitter is pressed. This is accomplished by the transmitter sending a radio frequency to the remote control door lock receiver (RCDLR). The signal is received by an internal antenna located within the RCDLR. The RCDLR interprets the signal and activates the door lock or door unlock 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. An incorrect transmitter may pass the test, but it will not activate the keyless entry system.

Schematic Reference

Remote Function Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Keyless Entry System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for Scan Tool Information

Special Tools Required

J 43241 Keyless Entry Tester

1. Perform the transmitter resynchronization procedure. Refer to Transmitter Programming .
2. Operate the LOCK and UNLOCK functions on the keyless entry transmitter. The doors should lock and unlock when commanded by the transmitter.

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 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 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 10 ohms of resistance between the ground circuit terminal N and ground.

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

5. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal E and ground.

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

6. Verify a test lamp illuminates between the ignition circuit terminal J and ground.

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

7. Connect the harness connector at the RCDLR.
8. Attempt to program the keyless entry transmitter. Refer to Transmitter Programming . The transmitter should successfully program and all keyless entry functions should operate.

⇒	If the transmitter does not program or keyless entry functionality is not restored, replace the RCDLR.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for RCDLR replacement, setup, and programming