Remote Keyless Entry Systems: Other Lexus LS III

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.

Rewrite Mode

Erases all previously registered transmitter codes and reprograms new transmitters.

Confirmation Mode

Informs user of number of existing transmitter codes already programmed in system.

Prohibition Mode

Erases all existing registered transmitter codes and cancels wireless door lock operation. Use this function if transmitter is lost or stolen.

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.

RECOGNITION CODE REGISTRATION

1. To begin programming, remove key from ignition switch. Ensure driver's door is open and unlocked, and all other doors are closed. Within 5 seconds, insert and remove key from ignition switch twice. Go to next step.
2. Complete the following in 40 seconds or less: close and open driver's door twice. Insert and remove key from ignition switch twice. Go to next step.
3. Complete the following in 40 seconds or less: close and open driver's door twice. Insert key into ignition switch. Close all doors. 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-27187-S20097071802001010800000) table. Remove key from ignition switch. Go to next step.
4. If any mode other than confirmation mode is selected, go to next step. If confirmation mode was selected, door locks will cycle 0-4 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 5 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. To finish add mode and rewrite mode, insert key into ignition switch. Open any door. Wait 40 seconds after code registration. If registering 4 codes at a time, mode will be finished when fourth code is registered.

REGISTRATION MODE SELECTION

WIRELESS DOOR LOCK CONTROL TUNER CIRCUIT

Ensure ignition is off. Disconnect 8-pin tuner connector. (Scheme 12) Measure continuity between connector terminal No. 5 and ground. Continuity should be present. Measure voltage between connector terminal No. 8 and ground. Voltage should toggle between 0-5 volts. If continuity and voltages are not to specification, check wiring for an open or short circuit. See WIRING DIAGRAMS.

Scheme 12

WIRELESS DOOR LOCK CONTROL RECEIVER CIRCUIT

Ensure wireless door lock control receiver circuit 8-pin connector is connected. Measure voltage (backprobe) between specified terminals and ground. (Scheme 13) See WIRELESS DOOR LOCK CONTROL RECEIVER CIRCUIT table. Replace wireless door lock control receiver as necessary.

WIRELESS DOOR LOCK CONTROL RECEIVER CIRCUIT

Scheme 13