DESCRIPTION
The immobiliser system compares the ID code that is registered to the certification ECU (smart key ECU assembly) with the ID code of the transponder chip that is embedded in the electrical key transmitter sub-assembly.
WIRING DIAGRAM
Refer to B279986.
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CAUTION / NOTICE / HINT
NOTICE:
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HINT:
If an immobiliser system or SFI system DTC is output, first perform troubleshooting for the immobiliser system or SFI system DTC.
PROCEDURE
| 1. | CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Smart Access > Trouble Codes| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTCs are output | B |
| B | | GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
| 2. | CHECK WHETHER ENGINE STARTS |
(a) Check that the engine starts 5 seconds after the engine switch turned on (IG).
OK:
Engine starts normally.
| OK | | USE SIMULATION METHOD TO CHECK |
|
| 3. | CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - ECM) |
(a) Disconnect the J36 ID code box (immobiliser code ECU) connector.
(b) Disconnect the A37 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| J36-3 (EFII) - A37-45 (IMO) | Always | Below 1 Ω |
| J36-4 (EFIO) - A37-59 (IMI) | Always | Below 1 Ω |
| J36-3 (EFII) or A37-45 (IMO) - Body ground | Always | 10 kΩ or higher |
| J36-4 (EFIO) or A37-59 (IMI) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | REGISTER ECU COMMUNICATION ID |
(a) Register the ECU communication ID code.
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|
| 5. | CHECK WHETHER ENGINE STARTS |
(a) Check that the engine starts.
OK:
Engine starts normally.
| OK | | END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE) |
|
| 6. | REPLACE ID CODE BOX (IMMOBILISER CODE ECU) |
(a) Replace the ID code box (immobiliser code ECU) with a new one.
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|
| 7. | REGISTER ECU COMMUNICATION ID |
(a) Register the ECU communication ID code.
Click here
|
| 8. | CHECK WHETHER ENGINE STARTS |
(a) Check that the engine starts.
OK:
Engine starts normally.
| OK | | END (ID CODE BOX (IMMOBILISER CODE ECU) WAS DEFECTIVE) |
| NG | | GO TO SFI SYSTEM |
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DESCRIPTION Navigation system components communicate with each other via MOST communication. If a line short or short to ground occurs in a MOST communication line, communication will not be possible and the navigation system will not operate normally. After the engine switch is turned on (ACC), if ...
Lexus RX (RX 350L, RX450h) 2016-2026 Owners Manual > For safety and security: Theft deterrent system
Immobilizer system
The vehicle's keys have built-in transponder chips that prevent the
hybrid system
from starting if a key has not been previously registered in the vehicle's
on-board computer.
Never leave the keys inside the vehicle when you leave the vehicle.
This system is designed to ...