DESCRIPTION
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
PROCEDURE
1. | CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Smart Access > Trouble Codes Powertrain > Engine > Trouble CodesOK:
DTCs are not output.
NG | ![]() | GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
2. | PERFORM ACTIVE TEST USING TECHSTREAM (IMMOBILISER INDICATOR) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Smart Access / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > Smart Access > Active Test Tester Display | Measurement Item | Control Range | Diagnostic Note |
---|---|---|---|
Immobiliser Indicator | Security indicator light | OFF/ON | - |
Tester Display |
---|
Immobiliser Indicator |
OK:
The security indicator light (radio receiver assembly) operates normally.
NG | ![]() | GO TO STEP 4 |
|
3. | CHECK SECURITY INDICATOR LIGHT (RADIO RECEIVER ASSEMBLY) OPERATION |
(a) When the immobiliser is set, check that the security indicator light (radio receiver assembly) blinks.*1
OK:
The security indicator light (radio receiver assembly) blinks normally.
(b) When the theft deterrent system is in the arming preparation state, check that the security indicator light (radio receiver assembly) illuminates.*2
OK:
The security indicator light (radio receiver assembly) illuminates normally.
Result | Proceed to |
---|---|
*1 is NG (*2 is OK) | A |
*2 is NG (*1 is OK) | B |
A | ![]() | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
B | ![]() | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
4. | CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - SECURITY INDICATOR LIGHT (RADIO RECEIVER ASSEMBLY)) |
(a) Disconnect the J41 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the J151 security indicator light (radio receiver assembly) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
J41-20 (IND) - J151-12 (SEUC) | Always | Below 1 Ω |
J41-20 (IND) or J151-12 (SEUC) - Body ground | Always | 10 kΩ or higher |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. | CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
(a) Reconnect the J41 certification ECU (smart key ECU assembly) connector.
(b) Reconnect the J151 security indicator light (radio receiver assembly) connector.
(c) Using an oscilloscope, check the waveform.
*a | Component with harness connected (Certification ECU (Smart Key ECU Assembly)) | - | - |
Measurement Condition:
Tester Connection | Condition | Specified Condition |
---|---|---|
J41-20 (IND) - Body ground | Engine switch off → on (IG) | Pulse generation → Below 2 V |
OK | ![]() | REPLACE SECURITY INDICATOR LIGHT (RADIO RECEIVER ASSEMBLY) |
NG | ![]() | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Can Communication System: Lost Communication with Gateway Module (Main Body ECU) (U1002)
DESCRIPTION
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When the main body ECU (multiplex network body ECU) receives a response signal from the ECUs connected ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Audio / Video: Window Glass Antenna Wire
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