Dimmer Signal Circuit

DESCRIPTION

The multiplex network body ECU sends a panel illumination signal to the radio receiver through this circuit.
The multiplex network body ECU determines the ambient brightness based on the light level detected by the automatic light control sensor and performs dim control.

WIRING DIAGRAM

INSPECTION PROCEDURE

1. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - MULTIPLEX NETWORK BODY ECU)

1. Disconnect the radio receiver connector R4 and multiplex network body ECU connector B7.

2. Measure the resistance according to the values in the table below.

   Standard resistance:

   Tester connection	Condition	Specified condition
   ADIM - ACAN	Always	Below 1 Ω
   ADIM - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2. INSPECT RADIO RECEIVER

1. Connect the multiplex network body ECU connector.

2. Turn the ignition switch to the ON position.

3. Turn the light control switch to the TAIL or HEAD position.

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

   Standard voltage:

   Tester connection	Condition	Specified condition
   ADIM - Body ground	Light control switch in TAIL or HEAD	10 to 14 V

NG	GO TO LIGHTING SYSTEM

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