AUDIO AND VISUAL SYSTEM (w/o Multi-display) Dimmer Signal Circuit

DESCRIPTION

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

WIRING DIAGRAM

A019KFDE06

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    1. Disconnect the G9 radio receiver assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G9-20 (ADIM) - Body ground Engine switch on (IG), automatic light control sensor covered by hand, and light control switch in the tail or head position 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here

  2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the G9 radio receiver assembly connector.

    2. Disconnect the F14 main body ECU (multiplex network body ECU) connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F14-22 (ACAN) - G9-20 (ADIM) Always Below 1 Ω
      G9-20 (ADIM) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here