Keyless Entry System Inoperative (Active)

Keyless Entry System Inoperative (Active)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

Circuit/System Description

The active keyless entry system is considered to be the device to control the following: door locking/unlocking, trunk access, and panic function. The keyless entry system 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 signal to the external RF antenna located in the back glass. This antenna is connected via coax cable to the remote control door lock receiver (RCDLR). The RCDLR interprets the signal and activates the requested function via serial data message. Poor performance of the system may be due to:

* Insufficient connection of the external RF Antenna to the RCDLR
* Low transmitter battery
* Radio Frequency (RF) interference from aftermarket devices such as 2-way radios, power inverters, cellular phone chargers, computers, etc
* High RF traffic areas, such as gas stations which use pay-at-the-pump RF transponders

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.

Reference Information
Schematic Reference

Remote Function Schematics (Remote Function Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Keyless Entry System Description and Operation (with RPO Y41) (Keyless Entry System Description and Operation (with RPO Y41))Keyless Entry System Description and Operation (without RPO Y41) (Keyless Entry System Description and Operation (without RPO Y41))
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information
Special Tools

J 43241 Keyless Entry Tester

Circuit/System Verification

Attempt to program the keyless entry transmitter, refer to Transmitter Programming (without RPO Y41) (Programming and Relearning)Transmitter Programming (with RPO Y41 - North America and Asia) (Programming and Relearning)Transmitter Programming (with RPO Y41 - Canada and Europe) (Programming and Relearning). The transmitter should program.

Circuit/System Testing

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

• If not the correct transmitter, replace the transmitter.

2. Verify the scan tool FOB Programmed parameter for the appropriate transmitter is Yes.

• If not the specified value, program the transmitter. Refer to Transmitter Programming (without RPO Y41) (Programming and Relearning)Transmitter Programming (with RPO Y41 - North America and Asia) (Programming and Relearning)Transmitter Programming (with RPO Y41 - Canada and Europe) (Programming and Relearning).

3. 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.

4. Inspect the external RF antenna connection at the RCDLR. First, gently pull on the coax connector at the module. If the coax comes out, then it wasn't seated properly. Remove and carefully inspect the coax connection for bent blades or a bent center pin. Fix coax connection if necessary and re-seat connector until a "click" is heard. Gently pull on the coax connection to make sure it is seated properly.
5. Operate the transmitter while observing the scan tool Fob Function parameter for the appropriate transmitter. The parameter should correspond with the function selected on the transmitter.

• If the parameter does not match the function selected on the transmitter, replace the transmitter.

6. Attempt to program the transmitter, refer to Transmitter Programming (without RPO Y41) (Programming and Relearning)Transmitter Programming (with RPO Y41 - North America and Asia) (Programming and Relearning)Transmitter Programming (with RPO Y41 - Canada and Europe) (Programming and Relearning). The transmitter should program.

• If the transmitter does not program, test the keyless entry antenna for an open/high resistance. If the circuit tests normal, replace the RCDLR.

Repair Instructions

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

* Transmitter Programming (without RPO Y41) (Programming and Relearning)Transmitter Programming (with RPO Y41 - North America and Asia) (Programming and Relearning)Transmitter Programming (with RPO Y41 - Canada and Europe) (Programming and Relearning)
* Control Module References (Programming and Relearning) for RCDLR replacement, setup, and programming