Basic Function Test
- Using inside door lock switches, lock and unlock door locks 3 times. Stand about 3 feet from outside driver's door handle. Point remote transmitter toward vehicle. Press one remote transmitter button for about one second. If doors lock and unlock, system is okay. If doors do not lock and unlock, go to next step.
- Replace remote transmitter battery and repeat step 1. If keyless entry operates, system is okay. If keyless entry does not operate, go to next step.
- Insert key in ignition switch and then remove. Insert key again and turn ignition switch to OFF, ON and OFF positions within 5 seconds. Within next 30 seconds, turn ignition switch to OFF, ON and OFF positions 9 times. System is now in self-diagnostic mode. If buzzer chirps for .2 seconds, pauses, then chirps for .5 seconds, go to step 5. If buzzer does not chirp, go to next step.
- Verify method used to enter into diagnostic mode is correct. If method is not correct repeat step 3. If buzzer will not chirp, check buzzer. See KEYLESS DOOR LOCK BUZZER under COMPONENT TESTS. If buzzer is okay, turn ignition on. Check for continuity between ground and terminal No. 2 (Yellow/Red wire) at 23-pin MPX body ECU harness connector. See Fig 1. If continuity does not exist, check continuity between ground and terminal No. 1 (White/Black wire) for unlock warning switch. If continuity does not exist, repair open in White/Black wire between unlock warning switch and ground behind left side of dashboard. See KEY UNLOCK WARNING SWITCH . If continuity exists between ground and White/Black wire, repair open in Yellow/Red wire between terminal No. 2 at MPX body ECU and terminal No. 2 at unlock warning switch. See WIRING DIAGRAMS .
- Verify remote transmitter operation by pressing each button and listening for chirps. Lock switch should chirp for .13 second, stop for 5 seconds and chip for .13 second again. Unlock switch should chirp for .13 second, stop for .25 second and chirp for .13 second and stop for .5 second. Open window switch should chirp .5 seconds on and .5 seconds off. If remote transmitter is not recognizing a code or is out or synchronization, buzzer will chirp continuously while receiving data. If lock, unlock and open window operates correctly, go to next step. If remote transmitter only chirps while receiving data, go into add or rewrite mode. See VEHICLE ACCESS CODE PROGRAMMING . If buzzer is not working, go to step 7.
- Press any switch on remote transmitter and hold for 20 seconds while walking around vehicle. Press button again. Verify range is a minimum of 3 feet from vehicle. If remote transmitter range is as specified, keyless door lock remote transmitter and receiver are normal. If remote transmitter range is not as specified, check range with another remote transmitter. If range is as specified, replace remote transmitter, if range is still not as specified, replace back door ECU. See BACK DOOR ECU under REMOVAL & INSTALLATION.
- Press each switch of existing or replacement remote transmitter programmed for this vehicle. If one remote transmitter causes vehicle to properly respond with the correct response, replace faulty remote transmitter. If both remote transmitters fail to respond, go to next step.
- Measure voltage between ground and terminal No. 2 (Blue/Red wire) at back door ECU harness connector. If battery voltage exists, go to next step. If battery voltage does not exist, check engine compartment fuse MPX-B (15-amp). Replace MPX-B fuse if blown. If fuse is okay, check power distribution to fuse MPX-B, If power exists, repair open in Blue/Red wire between terminal No. 2 at MPX-B fuse and terminal No. 2 at back door ECU harness connector. See WIRING DIAGRAMS
- Check continuity between body ground and terminal No. 26 (White/Black wire) at back door ECU harness connector. See Fig 2. If continuity exists, replace back door ECU. See BACK DOOR ECU under REMOVAL & INSTALLATION. If continuity does not exist, repair open in White/Black wire between terminal No. 26 at back door ECU harness connector and ground at left rear quarter panel.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002