Keyless Entry System Malfunction (Active)
Keyless Entry System Malfunction (Active)
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
Unwanted or inadvertent door lock/unlock activation may actually be triggered by the OnStar(R) Remote Link Apps. Customer may be unaware of account usage, contact Technical Assistance Center (TAC) if root cause cannot be diagnosed to vehicle.
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 (DH6)
Description and Operation
Keyless Entry System Description and Operation (With ATS) Keyless Entry System Description and Operation (With ATS)Keyless Entry System Description and Operation (Without ATS) Keyless Entry System Description and Operation (Without ATS)
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 Control Module References for scan tool information
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. 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 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
4. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Key with Integrated Transmitter Programming (without BTM) Key with Integrated Transmitter Programming (without BTM)Key with Integrated Transmitter Programming (with BTM) Key with Integrated Transmitter Programming (with BTM)
* Control Module References Control Module References for BCM replacement, programming and setup