Keyless Entry System Malfunction
Keyless Entry System Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Circuit/System Description
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 remote control door lock receiver, which then sends the signal to the body control module (BCM). The BCM 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.
Diagnostic Aids
* When using the J 43241 - Keyless Entry Tester, first inspect the keyless entry transmitter part number to determine that it is the correct model for the vehicle. An incorrect part number transmitter may pass the test, but it will not activate the keyless entry system.
* When the vehicle key is in the ignition, the keyless entry functions are disabled from all keyless entry transmitters.
Reference Information
Schematic Reference
Remote Function Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Sunshade - Left
Description and Operation
Keyless Entry System Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Special Tools
J 43241 - Keyless Entry Tester
Circuit/System Testing
1. Verify that the transmitter is a correct transmitter for the vehicle. This can be accomplished by comparing the part number printed on the transmitter to the appropriate part number in the parts catalog.
• If the transmitter is incorrect
Replace the transmitter.
• If the transmitter is correct
2. Place the transmitter on the test pad of the J 43241 - Keyless Entry Tester and press each transmitter button one at a time, holding each button for three seconds.
3. Verify the tester sounds a tone and illuminates the green light for the entire three second button press.
• If one or more buttons does not sound the tone and illuminate the green light
1. Replace the transmitter battery.
2. Retest with the J 43241 - Keyless Entry Tester.
3. Verify the tester sounds a tone and illuminates the green light for the entire three second button press.
• If one or more buttons does not sound the tone and illuminate the green light, replace the transmitter
• If all buttons sound the tone and illuminate the green light
4. All OK.
• If all buttons sound the tone and illuminate the green light
4. Operate the transmitter while observing the appropriate scan tool Key Fob Function parameter for the appropriate transmitter.
5. Verify the scan tool Key Fob Function parameter corresponds with the function selected on the transmitter.
• If the Key Fob Function parameter does not correspond with the transmitter selection
1. Replace the transmitter.
2. Operate the transmitter while observing the appropriate scan tool Key Fob Function parameter for the appropriate transmitter.
3. Verify the scan tool Key Fob Function parameter correspond with the function selected on the transmitter.
• If the Key Fob Function parameter does not correspond with the transmitter selection, replace the K9 BCM
• If the Key Fob Function parameter corresponds with the transmitter selection
4. All OK.
• If the Key Fob Function parameter corresponds with the transmitter selection
6. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Key with Integrated Transmitter Programming Programming and Relearning
* Control Module References Programming and Relearning for BCM replacement, setup, and programming