Initial Inspection and Diagnostic Overview

HEADLIGHT DIAGNOSIS
The headlight lights up by turning on the headlight relay built-in the front ECU, after receiving the headlight switch ON signal from the column switch. What's more, the lights automatically dim with the headlight automatic shutdown function.
The headlights are controlled by the Simplified Wiring System (SWS). For troubleshooting, refer to SWS Diagnosis.


Computers and Control Systems / Information Bus / Diagnosis.

Information Bus