DESCRIPTION
When the battery saving control operates, the main body ECU (multiplex network body ECU) controls the operation of the DOME CUT relay that is built into the instrument panel junction block assembly to turn off the interior lights.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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PROCEDURE
1. | PERFORM ACTIVE TEST USING TECHSTREAM |
(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 / Main Body / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > Main Body > Active Test Tester Display | Measurement Item | Control Range | Diagnostic Note |
---|---|---|---|
Relay for Interior Light Auto Cut Function | DOME CUT relay | ON or OFF |
|
Tester Display |
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Relay for Interior Light Auto Cut Function |
OK:
All of the interior lights turn off when ON is selected.
OK | ![]() | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
2. | CHECK HARNESS AND CONNECTOR (POWER SOURCE - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) |
(a) Disconnect the 2E instrument panel junction block assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition | Specified Condition |
---|---|---|
2E-1 - Body ground | Always | 11 to 14 V |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. | INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
(a) Remove the instrument panel junction block assembly.
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(b) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
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(c) Measure the voltage and resistance according to the value(s) in the table below.
*a | Component without harness connected (Instrument Panel Junction Block Assembly) | - | - |
Standard Voltage:
Tester Connection | Condition | Specified Condition |
---|---|---|
2D-19 - Battery negative terminal | Battery positive (+) → 2E-1 Battery negative (-) → MB-23 (DOMR) | 11 to 14 V |
2B-9 - Battery negative terminal | Battery positive (+) → 2E-1 Battery negative (-) → MB-23 (DOMR) | 11 to 14 V |
2B-10 - Battery negative terminal | Battery positive (+) → 2E-1 Battery negative (-) → MB-23 (DOMR) | 11 to 14 V |
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
2E-1 - 2D-19 | Always | 10 kΩ or higher |
2E-1 - 2B-9 | Always | 10 kΩ or higher |
2E-1 - 2B-10 | Always | 10 kΩ or higher |
OK | ![]() | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
NG | ![]() | REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Lumbar Switch: Installation
INSTALLATION CAUTION / NOTICE / HINT CAUTION: Wear protective gloves. Sharp areas on the parts may injure your hands. HINT:
Use the same procedure for the RH side and LH side.
The following procedure is for the LH side.
PROCEDURE 1. INSTALL FRONT LUMBAR POWER SEAT SWITCH (a) Engage the 4 ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Can Communication System: Brake Actuator (Skid Control ECU) Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area Brake Actuator (Skid Control ECU) Communication Stop Mode Either condition is met:
"Skid Control (ABS/VSC/TRAC)" is not displayed on the CAN Bus Check screen of the Techstream.
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