Keyless Entry System Malfunction (Active)
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Keyless Entry System Malfunction (Active)
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Circuit/System Description
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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.
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.
Schematic Reference
Remote Function Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Keyless Entry System Description and Operation (without ATH)
Keyless Entry System Description and Operation (with ATH)
Electrical Information Reference
Scan Tool Reference
Control Module References
for scan tool information
Special Tools
J 43241 Keyless Entry Tester
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Circuit/System Verification
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Attempt to program the keyless entry transmitter, refer to
Remote Control Door Lock and Theft Deterrent Transmitter Programming
. The transmitter should program.
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1.
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Verify that the transmitter is the correct transmitter for the vehicle.
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2.
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If not the correct transmitter, replace the transmitter.
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3.
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Place the transmitter on the test pad of the J 43241 and press each transmitter button one at a time, holding each button for three seconds. The tester should sound a tone and illuminate a green light for the entire three second button press.
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4.
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Note
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Before replacing the transmitter battery, inspect the transmitter battery contacts for any corrosion or damage. If corrosion or damage is found, replace the transmitter.
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If one or more buttons does not sound the tone and illuminate the green light for the entire three seconds, replace the transmitter battery and retest with the J 43241 . If the condition continues after battery replacement, replace the transmitter.
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5.
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Operate the transmitter while observing the appropriate scan tool Key Fob Function parameter for the appropriate transmitter. The parameter should correspond with the function selected on the transmitter.
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6.
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If the parameter does not match the function selected on the transmitter, replace the transmitter and retest. If the conditions continues after transmitter replacement, replace the K9 BCM.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
