Keyless Entry System - Remote: Other Lexus RX I

PROGRAMMING

Note. The remote keyless entry system is equipped with 2 transmitters, having 2 unique vehicle access codes programmed into the wireless door lock ECU.

MODES OF REGISTRATION

There are 4 registration (programming) modes

1. Add Mode Adds a transmitter without erasing existing transmitter codes. Four transmitter codes can be registered at one time. If number of registered codes exceeds 4, previously registered codes are erased in order, starting with first registered code.
2. Rewrite Mode Erases all previously registered transmitter codes and reprogram new transmitters.
3. Confirmation Mode Informs user of number of existing transmitter codes already programmed in system.
4. Prohibition Mode Erases all existing registered transmitter codes and cancels wireless door lock operation. Use this function if transmitter is lost or stolen.

REGISTRATION OF RECOGNITION CODE

1. To begin programming, remove key from ignition switch. Ensure driver's door is open and unlocked, and all other doors are closed. Insert key into ignition switch, and then remove it. Go to next step.
2. Complete the following in 40 seconds or less: press door lock switch to LOCK position, and then within one second, press door lock switch to UNLOCK position. Repeat procedure continuously until door locks have been locked and unlocked 5 times. Close, and then open driver's door. Go to next step.
3. Complete the following in 40 seconds or less: repeat procedure in step 2 , except for closing and opening driver's door. Insert key into ignition switch. To enter desired mode, turn ignition switch to ON position and back to LOCK position (one cycle), within one second, the specified number of times. See «REGISTRATION MODE SELECTION»(ref-3419-S08807442942000050300000) table. Remove key from ignition switch. Go to next step. REGISTRATION MODE SELECTION Registration Mode No. Of Ignition Switch Cycles Add 1 Rewrite 2 Confirmation 3 Prohibition 5
4. If any mode other than confirmation mode is selected, go to next step. If confirmation mode was selected, door locks will cycle 1-4 times depending on how many transmitter codes are stored in ECU. Example: two stored codes equals 2 door lock/unlock cycles. Registration of confirmation code is complete after door locks cycle.
5. Complete the following in 40 seconds or less: if add mode, rewrite mode or prohibition mode is selected, to confirm proper initiation, door locks will automatically cycle one time for add mode, 2 times for rewrite mode and 5 times for prohibition mode. Press transmitter LOCK and UNLOCK buttons simultaneously for at least 1.5 seconds, and then within 3 seconds, press any transmitter button for at least one second. Go to next step.
6. If within 3 seconds, door locks cycle one time, new transmitter code has been successfully accepted. Go to next step. If door locks cycle 2 times, new transmitter code was not accepted. To program an additional transmitter or to make a second attempt, return to step 5 within 40 seconds.
7. Registration of recognition codes is complete under any of the following conditions: Forty seconds has elapsed since wireless door lock ECU has responded. Driver's door is closed. Key is inserted into ignition key cylinder. Four recognition codes are registered at one time.

REMOTE TRANSMITTER INOPERATIVE

1. Remove key from ignition switch. Ensure all doors are closed and locked. While standing outside vehicle near driver's door, point transmitter toward vehicle. Press door LOCK button, and then UNLOCK button 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 okay at this time.
2. Observe transmitter LED while pressing transmitter LOCK and UNLOCK buttons. If transmitter LED illuminates when transmitter LOCK and UNLOCK buttons are pressed, go to step 4 . If transmitter LED does not illuminate when transmitter LOCK and UNLOCK buttons are pressed, go to next step.
3. Replace transmitter battery. Check transmitter functions. If transmitter still does not operate properly, go to next step. If transmitter operates properly with new battery, system is okay.
4. Remove key from ignition switch. Ensure all doors are closed and locked. Go to next step.
5. Perform the following within 35 seconds: insert key into ignition switch, and then remove it. Insert key once more. Turn ignition on, and then off one time within 5 seconds. Within 30 seconds, turn ignition on and off 9 additional times. Buzzer should chirp, indicating successful entry into diagnostic mode. If buzzer chirps and system enters diagnostic mode as specified, go to next step. If system does not enter diagnostic mode regardless of buzzer operation, go to step 9 .
6. Press LOCK button on transmitter. Buzzer should produce a short chirp about every .5 second. Press UNLOCK button on transmitter. Buzzer should produce 2 short chirps about every .5 second. Press PANIC button on transmitter. Buzzer should produce a long chirp about every .5 second. If buzzer operation is as specified, go to next step. If buzzer produces a long continuous chirp, go to step 11 . If buzzer does not produce any chirp, go to step 12 .
7. While standing about 3 feet from vehicle, press any transmitter button for 20 seconds (buzzer should chirp continuously), and then press button again. If buzzer operates as specified, other body control systems are at fault (transmitter and wireless door lock ECU are okay). See BODY CONTROL SYSTEMS - RX300 article. If buzzer does not operate as specified, go to next step.
8. Transmitter or wireless door lock ECU is faulty. Repeat step 7 using a known-good transmitter. Replace original transmitter if necessary. If problem still exists, check wireless door lock ECU. See «WIRELESS DOOR LOCK ECU RECEIVER CIRCUIT»(ref-3419-S41450527832000050300000) under CIRCUIT TESTS. Repair as necessary.
9. Repeat step 5 , ensuring procedures are performed correctly. If buzzer operation is normal, but still does not enter diagnostic mode, go to next step. If buzzer still does not chirp, check wireless door lock buzzer. See «WIRELESS DOOR LOCK BUZZER»(ref-3419-S05527951912000050300000) under COMPONENT TESTS. Repair as necessary.
10. Insert key into ignition switch. Using DVOM, check for continuity between ground and terminal No. 8 (Blue wire) at body ECU harness connector "C". See «WIRING DIAGRAMS»(ref-3419-S22085945902000050300000) . Continuity should be present. If continuity is not present, repair key unlock warning switch or circuit as necessary.
11. Program transmitter. See «TRANSMITTER PROGRAMMING»(ref-3419-S35686991372000050300000) . Retest system operation.
12. Repeat step 6 using a known-good transmitter. If transmitter operates, replace original transmitter. If transmitter does not operate, go to next step.
13. Using jumper wire, connect terminals Tc and E1 of DLC1 together. If DTC B1242/42 is present, repair short circuit in Blue wire between terminal No. 4 of wireless door lock ECU and terminal No. 16 of body ECU harness connector "B". See «WIRING DIAGRAMS»(ref-3419-S22085945902000050300000) . If DTC B1242/42 is not present, go to next step.
14. Using DVOM, measure voltage between ground and terminal No. 16 (Blue wire) at body ECU harness connector "B" without operating transmitter. See «WIRING DIAGRAMS»(ref-3419-S22085945902000050300000) . If battery voltage is present, go to next step. If battery voltage is not present, repair open in Blue wire.
15. Remove key from ignition switch. Ensure all doors are closed and locked. Using DVOM, measure voltage between ground and terminal No. 3 (Blue/Yellow wire) at wireless door lock ECU. See «WIRING DIAGRAMS»(ref-3419-S22085945902000050300000) . Voltage should be 4.5-5.5 volts. Voltage should be zero volts when transmitter is operated. If voltage is as specified, go to next step. If voltage is not as specified, repair open in Blue/Yellow wire between terminal No. 3 of wireless door lock ECU and terminal No. 15 of body ECU harness connector "B".
16. Using DVOM, check for continuity between chassis ground and terminal No. 1 (White/Black wire) at wireless door lock ECU. See «WIRING DIAGRAMS»(ref-3419-S22085945902000050300000) . If continuity is present, wireless door lock ECU is faulty. If continuity is not present, repair open or poor connection in White/Black wire.

WIRELESS DOOR LOCK BUZZER CIRCUIT

Note. See BODY CONTROL SYSTEMS - RX300 article.

WIRELESS DOOR LOCK ECU RECEIVER CIRCUIT

Note. For additional wireless door lock ECU receiver circuit testing, see BODY CONTROL SYSTEMS - RX300 article.

WIRELESS DOOR LOCK BUZZER

Disconnect door lock buzzer connector. Using DVOM, check for continuity between buzzer terminals. Resistance should be about 1000 ohms. If resistance is not as specified, replace door lock buzzer.