Light Control Switch Circuit

LIGHTING (EXT): LIGHTING SYSTEM: Light Control Switch Circuit

Light Control Switch Circuit

DESCRIPTION

The main body ECU (driver side junction block assembly) receives the following switch information:

- Light control switch position off, tail, head or AUTO
- Dimmer switch position high, low or high flash (pass)
- Fog light switch position on or off

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

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

Main Body





OK:
Normal conditions listed above are displayed.

NG -- INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY
OK -- PROCEED TO NEXT SUSPECTED AREA 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 Components.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

Light Control Switch





Dimmer Switch





Fog Light Switch





OK:
Headlight dimmer switch assembly is normal.

Text in Illustration





NG -- REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - SWITCH ASSEMBLY)




(a) Disconnect the D33 headlight dimmer switch assembly connector.
(b) Disconnect the D49, D50 and 2N main body ECU (driver side junction block assembly) connectors.
(c) 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 MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)