Headlight Dimmer Switch Circuit

LIGHTING (EXT): LIGHTING SYSTEM: Headlight Dimmer Switch Circuit
- Headlight Dimmer Switch Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) receives the following switch information:

* Light control switch position is off, tail, head or AUTO

* Dimmer switch position is high, low or high flash (pass)

* Front fog light switch position is on or off

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(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 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





Dimmer Switch





Front Fog Light Switch





OK:

Headlight dimmer switch assembly is normal.

Text in Illustration





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

3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - HEADLIGHT DIMMER SWITCH ASSEMBLY)

(a) Disconnect the F20 headlight dimmer switch assembly connector.

(b) Disconnect the F9 main body ECU (multiplex network body ECU) connector.

(c) 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) Service and Repair