AUDIO AND VISUAL SYSTEM(w/o Parking Assist Monitor System) Dimmer Signal Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) sends an auto dimmer signal to the radio receiver assembly via this circuit.

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

*a	ACAN
*b	ADIM
*c	Main Body ECU (Multiplex Network Body ECU)
*d	Radio Receiver Assembly

CAUTION / NOTICE / HINT

PROCEDURE

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

   
   

   1. Disconnect the K72 radio receiver assembly connector.

   2. 

      *a	Front view of wire harness connector (to Radio Receiver Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition K72-3 (ADIM) - Body ground Power switch on (IG) Automatic light control sensor covered by hand, and light control switch in tail or head position 9 V or higher

      Result
      Proceed to OK NG

   
   

   OK

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

   NG

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

   
   

   1. Disconnect the K2 main body ECU (multiplex network body ECU) connector.

   2. Disconnect the K72 radio receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition K2-28 (ACAN) - K72-3 (ADIM) Always Below 1 Ω K2-28 (ACAN) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   OK

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

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR