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

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - AUDIO / VIDEO

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

Audio And Visual System (W/O Navigation System) - Dimmer Signal Circuit. AUDIO / VIDEO. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

1.INSPECT MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)
Audio And Visual System (W/O Navigation System) - Dimmer Signal Circuit. AUDIO / VIDEO. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the F19 radio receiver assembly connector.

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

  • Standard Voltage:
  • Tester ConnectionSwitch ConditionSpecified Condition
    F19-20 (ADIM) - Body groundEngine switch on (IG), automatic light control sensor covered by hand, and light control switch tail or head position11 to 14 V
Text in Illustration
*1Front view of wire harness connector
(to Radio Receiver Assembly)
NG
Go to step 3
OK
2.INSPECT RADIO RECEIVER ASSEMBLY

Disconnect the F1 radio receiver assembly connector.

Audio And Visual System (W/O Navigation System) - Dimmer Signal Circuit. AUDIO / VIDEO. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    F1-20 (GND) - Body groundAlwaysBelow 1 Ω
Text in Illustration
*1Front view of wire harness connector
(to Radio Receiver Assembly)
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE RADIO RECEIVER ASSEMBLY ()
3.CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - MAIN BODY ECU)

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

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    E2-16 (ACAN) - F19-20 (ADIM)AlwaysBelow 1 Ω
    F19-20 (ADIM) - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)