RX400h · Service Manual BODY ELECTRICAL

Illumination Circuit

Circuit diagnosis

DESCRIPTION

Power is supplied to the radio receiver illumination when the light control switch is in the TAIL or HEAD position.

WIRING DIAGRAM

E110889E01

INSPECTION PROCEDURE


1. CHECK ILLUMINATION

  1. Check if the illumination for the radio receiver, headlight cleaner switch, glove box or others (seat heater switch, cigarette lighter, etc.) comes on when the light control switch is turned to the HEAD or TAIL position.

    Result:
    Result
    		 Proceed to
    Illumination comes on for all components except radio receiver.
    		 A
    Illumination comes on only for glove box and steering pad switch.
    		 B
    No illumination comes on (seat heater switch, cigarette lighter, glove box, etc.).
    		 C



B
Go to step 4

C
GO TO LIGHTING SYSTEM
A


2. INSPECT RADIO RECEIVER

  1. E110929E01
    Disconnect the radio receiver connector R2.

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

    Standard voltage:
    Tester connection
    		 Condition
    		 Specified condition
    ILL+ - Body ground
    		 Light control SW HEAD or TAIL
    		 10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMBINATION METER)

  1. E110931E01
    Disconnect the radio receiver connector R2 and combination meter connector C8.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester connection
    		 Condition
    		 Specified condition
    ILL- (R2-12) - C8-2
    		 Always
    		 Below 1 Ω
    ILL- (R2-12) - Body ground
    		 Always
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

RETURN TO THE ORIGINAL INSPECTION FLOW BECAUSE THE CHECK RESULT IS NORMAL

4. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMBINATION METER)

  1. E110931E01
    Disconnect the radio receiver connector R2 and combination meter connector C8.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester connection
    		 Condition
    		 Specified condition
    ILL- (R2-12) - C8-2
    		 Always
    		 Below 1 Ω
    ILL- (R2-12) - Body ground
    		 Always
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

GO TO COMBINATION METER SYSTEM


← Steering Pad Switch CircuitSpeaker Circuit →