Audio And Visual System (W/O Navigation System) Dimmer Signal Circuit

Audio Visual Telematics. Land Cruiser. Urj200, 202 Grj200 Vdj200
Audio Video. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

INSPECT RADIO RECEIVER ASSEMBLY

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - MAIN BODY ECU)

AUDIO AND VISUAL SYSTEM (w/o Navigation System) - Dimmer Signal Circuit


DESCRIPTION

The radio receiver assembly uses this circuit to communicate with the main body ECU (cowl side junction block LH) via a direct line. The main body ECU (cowl side junction block LH) uses this circuit to send an auto dimmer signal to the radio receiver assembly. The main body ECU (cowl side junction block LH) detects the position of the light control switch according to the resistance. When the light control switch is set to the head/tail position, the resistance between the head/tail terminal and body ground is below 1 Ω. When the light control switch is set to the head/tail position, the main body ECU (cowl side junction block LH) sends an auto dimmer signal to the radio receiver assembly. When the radio receiver assembly receives an auto dimmer signal from the main body ECU (cowl side junction block LH), the radio receiver assembly causes instrument panel illumination to be dimmed.

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Audio Video.Audio And Visual System (For Radio Receiver Type).Audio And Visual System (W/O Navigation System) Dimmer Signal Circuit


INSPECTION PROCEDURE

1.INSPECT MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Audio Video.Audio And Visual System (For Radio Receiver Type).Audio And Visual System (W/O Navigation System) Dimmer Signal Circuit

  1. Disconnect the F19 radio receiver assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    F19-20 (ADIM) - Body ground
    		Engine switch on (IG), automatic light control sensor covered by hand, and light control switch tail or head position
    		11 to 14 V
    Text in Illustration
    *1
    		Front view of wire harness connector
    (to Radio Receiver Assembly)


NG
Go to step 3
OK


2.INSPECT RADIO RECEIVER ASSEMBLY

  1. Disconnect the F1 radio receiver assembly connector.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Audio Video.Audio And Visual System (For Radio Receiver Type).Audio And Visual System (W/O Navigation System) Dimmer Signal Circuit

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    F1-20 (GND) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *1
    		Front view of wire harness connector
    (to Radio Receiver Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE RADIO RECEIVER ASSEMBLY (Click here)

3.CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - MAIN BODY ECU)

  1. Disconnect the F19 radio receiver assembly and E2 main body ECU (cowl side junction block LH) connectors.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E2-16 (ACAN) - F19-20 (ADIM)
    		Always
    		Below 1 Ω
    F19-20 (ADIM) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)