Precheck and Diagnosis

PRECHECK DIAGNOSIS





1. INSPECT TRANSMITTER

2. REPLACE WIRELESS DOOR LOCK ECU AND TRANSMITTER

HINT: Disassembly and assembly of the transmitter includes details of spare parts and replacement procedure for detective parts found through troubleshooting.
Each part is a precision electronic component so handle with care.





(a) Spare parts and replacement procedure for malfunctioning parts (transmitter malfunction):
(1) Prepare a new transmitter.
(2) Registration of recognition code.
(3) Check that door lock remote control operation works.





(b) Spare parts and replacement procedure for malfunctioning parts (battery malfunction):
(1) Prepare a new battery.
(2) Remove the battery from transmitter.
(3) Install a new battery into transmitter.





(c) Spare parts and replacement procedure for malfunctioning parts (ECU malfunction):
(1) Prepare a new ECU.
(2) Remove the ECU from the vehicle.
(3) Install a new ECU in the vehicle.
(4) Registration of recognition code.
(d) Replace the battery for transmitter.





(1) Using a screwdriver, pry outward the cover.





(2) Remove the battery.
(3) Set a new battery into the transmitter.
(4) Install the cover to the transmitter.

3. REGISTRATION OF RECOGNITION CODE
The recognition code of the transmitter is electronically registered (written to and stored) in an EEPROM contained in the wireless door lock ECU. This makes it possible to register up to 2 different codes in the EEPROM.
New recognition codes can be registered after all previous codes have been erased. A transmitter code can be registered into the EEPROM by following the steps numbered (1) to (5).
(1) Use a test lead to short the PRG and GND connector together. As a result, the PRG terminal of the wireless door lock ECU will be grounded to body and will cause all transmitter recognition codes previously registered in the EEPROM to be erased. At the same time, the ECU will respond by operating once the lock and unlock functions of all the doors and the open function.
(2) A transmitter recognition code is registered by pressing any single button of the transmitter to be registered. Once the code is registered, the ECU responds again by operating once the lock and unlock functions of all the doors.
(3) To register the recognition code of an additional transmitter, follow the procedure shown in (b).
(4) After completing the registration of the codes, remove the test lead from the remote control mirror switch connector terminals to allow the system to revert to the normal operation.
(5) Using the registered transmitter, verify that the system operates properly.








4. DIAGNOSTIC PROCEDURE