Keyless Entry System Malfunction (with ATH)
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Keyless Entry System Malfunction (with ATH)
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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Keyless Entry Antenna Signal - Driver
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B3119 02
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B3119 05
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B3119 05
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-
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Keyless Entry Antenna Low Reference - Driver
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-
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B3119 05
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-
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-
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Keyless Entry Antenna Signal - Passenger
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B3120 02
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B3120 05
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B3120 05
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-
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Keyless Entry Antenna Low Reference - Passenger
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-
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B3120 05
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-
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-
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Keyless Entry Antenna Signal - Rear Fascia
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B3121 02
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B3121 05
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B3121 05
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-
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Keyless Entry Antenna Low Reference - Rear Fascia
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-
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B3121 05
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-
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-
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Keyless Entry Antenna Signal - Front Console
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B3122 02
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B3122 05
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B3122 05
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-
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Keyless Entry Antenna Low Reference - Front Console
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-
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B3122 05
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-
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-
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Keyless Entry Antenna Signal - Rear Console
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B3123 02
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B3123 05
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B3123 05
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-
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Keyless Entry Antenna Low Reference - Rear Console
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-
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B3123 05
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-
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-
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Keyless Entry Antenna Signal - Rear Compartment
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B3124 02
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B3124 05
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B3124 05
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-
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Keyless Entry Antenna Low Reference - Rear Compartment
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-
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B3124 05
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-
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-
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Circuit/System Description
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The keyless entry antennas are used as short range low frequency (LF) transmitters. As a vehicle with locked doors is approached with a key fob and the exterior door handle is pulled, the keyless entry antenna transmitter broadcasts a challenge to the key fob in an approximately 1 meter range. If the response from the key fob via radio frequency (RF) is valid, the locked door will be passively unlocked/unlatched and allow the door to be opened. The front doors will open with one pull of the front door handle. The rear doors will unlock with the first pull of the door handle and unlatch with the second pull of the door handle. 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.
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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1.
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Ignition ON, observe the scan tool Exterior Driver Door Handle Switch, Exterior Passenger Door Handle Switch, and Trunk Release Switch parameters while operating their respective release handle/touch pad. The parameter should change between Active and Inactive as commanded.
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3.
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With the vehicle locked, attempt to passively unlock and access the vehicle at the left door, right door, and rear compartment by approaching the vehicle with a valid transmitter and operating their respective release handle/touch pad. Each door and the rear compartment should unlock/unlatch and open.
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4.
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If both doors and the rear compartment do not unlock/unlatch and open, refer to Passive Transmitter Malfunction.
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5.
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If only one door or the rear compartment does not unlock/unlatch and open, refer to Antenna Circuit Malfunction.
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Passive Transmitter Malfunction
Place the keyless entry transmitter on the J 43241 and approach the vehicle. Operate the release handle/touch pad. Verify the J 43241 sounds a tone.
Antenna Circuit Malfunction
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1.
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Ignition OFF, disconnect the harness connector at the inoperative keyless entry antenna.
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2.
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Ignition ON, verify a test lamp does not illuminate between the signal circuit terminal 1 and ground.
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3.
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If the test lamp illuminates, test the signal circuit for a short to voltage. If the circuit tests normal, replace the keyless entry control module.
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4.
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Install a DMM between the signal circuit terminal 1 and the low reference circuit terminal 2. Set the DMM to capture AC voltage using the MIN MAX function.
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5.
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Operate the release handle/touch pad. Verify the DMM captured and AC voltage signal.
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6.
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If an alternating voltage was not captured, test the signal circuit and the low reference circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the keyless entry control module.
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7.
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If all circuits test normal, test or replace the keyless entry antenna.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
