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 is in off, tail, head or AUTO position

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

* Front fog light switch is in on or off position

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 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 Removal.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Light Control Switch (w/ DRL OFF function)





Light Control Switch (w/o DRL OFF function)





Dimmer Switch





Front Fog Light Switch*1





*1: w/ Front Fog Light

OK:

Headlight dimmer switch assembly is normal.

Text in Illustration





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

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

(a) Disconnect the I13 main body ECU (multiplex network body ECU) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





*1: w/ Front Fog Light

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Removal