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

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 Exterior Lighting System

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

Light Control Switch:

Dimmer Switch

Dimmer Switch:

Fog Light Switch

Fog Light Switch:

OK:

Headlight dimmer switch assembly is normal.

Text in Illustration

Text in Illustration:

NG -- REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY Components
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

Text in Illustration:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) Components