IG Signal Circuit

LIGHTING: LIGHTING SYSTEM: IG Signal Circuit

IG Signal Circuit

DESCRIPTION

- The main body ECU receives IG signal to control the following systems:

- Automatic light control system
- Light auto turn-off system
- Daytime running light system
- Illuminated entry system

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 FUSE (ECU-IG NO. 1)
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. INSPECT FUSE (ECU-IG NO. 1)
(a) Remove the ECU-IG No. 1 fuse from the instrument panel junction block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE FUSE
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (IG POWER SOURCE CIRCUIT)





(a) Measure the voltage between the loading slot of the fuse and body ground.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)