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Keyless Entry System Malfunction - Active

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    • 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 the vehicle key is in the ignition, the keyless entry functions are disabled from the keyless entry transmitter.

Reference Information

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

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

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 catalogue.
    2. [ARW-LISTFAIL]

  2. If the transmitter is incorrect

    Replace the transmitter.

    3. [/ARW-LISTFAIL][ARW-LISTPASS]

  3. If the transmitter is correct

    4. [/ARW-LISTPASS]
  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.
    6. [ARW-LISTFAIL]

  6. If the Key Fob Function parameter does not correspond with the transmitter selection

    7. [/ARW-LISTFAIL]
    3.1. Replace the transmitter.
    3.2. Operate the transmitter while observing the appropriate scan tool Key Fob Function parameter for the appropriate transmitter.
    3.3. Verify the scan tool Key Fob Function parameter correspond with the function selected on the transmitter.
    [ARW-LISTFAIL]

  7. If the Key Fob Function parameter does not correspond with the transmitter selection, replace the K9 BCM

    8. [/ARW-LISTFAIL][ARW-LISTPASS]

  8. If the Key Fob Function parameter corresponds with the transmitter selection

    9. [/ARW-LISTPASS]
    3.4. All OK.
    [ARW-LISTPASS]

  9. If the Key Fob Function parameter corresponds with the transmitter selection

    10. [/ARW-LISTPASS]
  10. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Replacing Keys
    • Control Module References for BCM replacement, setup, and programming
   


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