Light Control Switch Circuit

LIGHTING: LIGHTING SYSTEM: Light Control Switch Circuit

Light Control Switch Circuit

DESCRIPTION

The combination switch ECU (windshield wiper switch assembly) receives the following switch information:

- Light control switch position is Off, Tail, Head, or Auto
- Headlight dimmer switch position is High, Low, or Flash (Pass)
- Turn signal switch position is LH, RH, or Off
- Fog light switch position is On or Off

The combination switch ECU then converts these signals to BEAN signals and sends them to each ECU via the multiplex communication system.
The headlight dimmer switch assembly includes the light control, headlight dimmer, turn signal, and fog light switches.

WIRING DIAGRAM





INSPECTION PROCEDURE
HINT:
Before starting the procedure, check that the multiplex communication system DTCs are not output Multiplex Communication System.

PROCEDURE

1. READ VALUE USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Combination Switch / Data List.
(e) Read the display on the Techstream.

Combination Switch (Combination Switch ECU):





OK:
Condition information can be displayed.
NG -- INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY
HINT:
Inspect the items that did not change as a result of monitoring the DATA LIST.




(a) Remove the headlight dimmer switch assembly.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Light Control Switch





Headlight Dimmer Switch





Turn Signal Switch





Fog Light Switch





NG -- REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR




(a) Disconnect the J26 windshield wiper switch assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





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






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY