Keyless Entry System Inoperative

Keyless Entry System Inoperative

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 keyless entry system is a vehicle entry device. Keyless entry will unlock the vehicle doors when a corresponding button on the remote-key is pressed. This is accomplished by the remote-key sending a radio frequency to the steering column module (CIM). The CIM interprets the signal and activates the requested function. A low remote-key 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.


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 (Description and Operation)
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 Required

J 43241 Keyless Entry Tester


Circuit/System Verification

1. Place the remote-key on the test pad of the J 43241 and press each button of the remote-key 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 remote-key battery and retest with the J 43241 . If the condition continues after battery replacement, replace the remote-key.

2. Verify the scan tool Transponder Key parameter for the appropriate remote-key is Programmed.

• If not the specified value, program the remote-key. Refer to Replacing Keys (Service and Repair) .

3. Operate the remote-key while observing the scan tool Remote Key Function parameters. The parameter should correspond with the function selected on the remote-key.

• If the parameter does not match the function selected on the remote-key, program the remote-key and retest. Refer to Replacing Keys (Service and Repair) . If the condition continues after remote-key programming, replace the remote-key.

4. If all circuits test normal, replace the CIM.



Repair Instructions

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

* Replacing Keys (Service and Repair)
* Control Module References (Programming and Relearning)for CIM replacement, setup, and programming