Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Transmitter Signal Check
Perform test when door locks do not operate properly to verify door lock ECU receives and recognizes signals from transmitter.
- Ensure key is not inserted into ignition switch. All doors are closed and locked. Turn buzzer volume to maximum (located under left side of instrument panel).
- Standing outside vehicle near driver's door, point transmitter toward vehicle. Press door lock and unlock switch on transmitter for about one second. If doors do not lock and unlock properly, go to next step. If doors lock and unlock properly, system is functioning at this time.
- Check transmitter battery voltage (1.5 volts) or replace batteries and recheck remote door lock operation. If door locks still do not operate remotely, enter door lock diagnostic mode.
- The following procedure must be carried out within 35 seconds. Insert key into ignition switch, then remove it, turn ignition on and off 10 times. Buzzer should sound a short tone followed by a longer tone, indicating successful entry to diagnostic mode. If buzzer sounds as specified, go to next step. If buzzer does not sound, repeat procedure.
- Press LOCK button on remote transmitter. Buzzer should produce a short tone about every .5 second. Press UNLOCK button on transmitter. Buzzer should produce 2 short tones about every .5 second. Press trunk switch. Buzzer should produce a long tone about every .5 second. If buzzer does not operate for each button pressed, transmitter may be faulty. Try other transmitter. If buzzer operates as specified, go to step 7). If buzzer sounds a long continuous tone, go to next step.
- A long continuous tone indicates transmitter is operating, but transmitter code is not recognized by ECU. Perform VEHICLE ACCESS CODE PROGRAMMING and recheck remote door lock operation. If remote door locks still do not operate properly, attempt diagnosis by symptom. See TROUBLE SHOOTING .
- Standing at least 3 feet away from vehicle, press and hold transmitter switch. After holding button for 20 seconds, buzzer should stop. If operation is not as specified, go to next step. If operation is as specified, check wireless door lock ECU circuits (power and outputs). If door lock ECU circuits are okay, replace door lock ECU.
- Repeat procedure in step 7) using other transmitter and check effective range. If buzzer operates as specified, replace original transmitter. If buzzer does not operate properly using both transmitters, door lock ECU is faulty. Replace ECU with known-good unit.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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