Light Control Switch Circuit: Description

The main body ECU receives the following signals:

• Light control switch TAIL, HEAD, or AUTO signal
• Dimmer switch HIGH or HIGH FLASH (PASS) signal
• Front fog light switch signal

HINT: 

When performing troubleshooting, inspect the switch that is related to the malfunction. For example, if both right and left low beam headlights do not illuminate, read the light control switch HEAD signal value only in the data list. If the value is normal, perform the headlight relay active test.