Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: On-vehicle Inspection

HINT:

• The present signal reading and history signal reading will be displayed alternately after the engine switch is turned on (IG). By measuring the duration of each header, the present signal reading and history signal reading can be recognized.
• A unit malfunction indicates an internal malfunction of the semiconductor power integration ECU. If a malfunction is detected for any channel from channel 0 to 7, an electrical load connected to the semiconductor power integration ECU may be malfunctioning or there may be a short in the semiconductor power integration ECU circuit or in the wire harness.
• The present signal reading will be stored as a history signal reading when electrical loads are operated after a malfunctioning part returns to normal.
• Both present and history signal readings can be cleared by disconnecting the cable from the negative (-) battery terminal.
• Depending on the specification, different electrical loads connected to channels 0 to 7 are provided. Refer to the table below:

  Channel	Connected Electrical Load
  ch0	Cooler compressor assembly (Magnetic clutch assembly)
  ch1	Rear window defogger wire
  ch2	Windshield deicer wire*1
  ch3	Front fog lights
  ch4	Daytime running lights*2
  ch5	Stop lights
  ch6	High beam headlight RH*2
  ch7	High beam headlight LH*2

• *1: w/ Windshield Deicer System
• *2: w/o Headlight Beam Level Control System

1. Remove the semiconductor power integration ECU.

   Click here

2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   1D-11 - Body ground	Engine switch on (IG)	11 to 14 V

   If the result is not as specified, repair or replace the wire harness or connector.

Components

COMPONENTS ILLUSTRATION *1 BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY *2 NO. 1 RELAY BLOCK COVER *3 RESERVOIR BRACKET *4 SEMICONDUCTOR POWER INTEGRATION ECU N*m (kgf*cm, ft.*l ...

Removal

REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed and installed, or replaced during int ...

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