Dimmer Signal Circuit
AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM (w/o Navigation System without Multi-display): Dimmer Signal Circuit
- 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 1 Ohms. 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 instrument panel illumination to be dimmed.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
(a) Disconnect the radio receiver assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- CHECK HARNESS AND CONNECTOR
OK -- Continue to next step.
2. INSPECT RADIO RECEIVER ASSEMBLY
(a) Disconnect the radio receiver assembly connector.
(b) Measure the resistance according to the value(s) in the table below
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE RADIO RECEIVER ASSEMBLY Removal
3. CHECK HARNESS AND CONNECTOR
(a) Disconnect the radio receiver assembly and main body ECU (multiplex network body ECU) connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Instrument panel J/B)