Initial Inspection and Diagnostic Overview

LIGHTING SYSTEM DIAGNOSIS

HEADLIGHT DIAGNOSIS

Taillight control
The taillight lights up by turning on the taillight relay built-in the front-ECU, after receiving the taillight switch ON signal from the column switch. What's more, the lights automatically dim with the headlight automatic shutdown function.

The taillights are controlled by the Simplified Wiring System (SWS). For troubleshooting, refer to SWS Diagnosis in Body Control Systems.

Headlight control
The headlight lights up by turning on the headlight relay built-in the front-ECU, after receiving the head-light 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 in Body Control Systems.

HEADLIGHT AUTOMATIC SHUTDOWN FUNCTION
The headlight automatic shutdown function is activated with the following procedures. What's more, the user can switch the operations Yes/No mode and operation conditions from the adjustment function. Refer to ADJUSTMENT PROCEDURES OF SWS FUNCTION in Body Control Systems for adjustment methods and adjustment details (post-adjustment operations).
1. Ignition switch: ON or ACC
2. Headlight switch: ON
3. Driver's door: Open (Driver's door switch: ON)
4. Ignition switch: LOCK (OFF)

NOTE: The headlight automatic shutdown function is activated even if the order of Step 3 and 4 are reversed.

Restoration conditions from automatic light shutdown taking effect with the headlight automatic shutdown function.
- Turn OFF the headlight switch and then turn ON the headlight switch again.

NOTE: The lights may dim again 3 minutes after the lights are restored with the headlight switch depending on the settings (adjustment functions).

- Turn the ignition switch from the "LOCK" (OFF)position to the ON position.

The headlight automatic shutdown function are controlled by the Simplified Wiring System (SWS). For troubleshooting, refer to SWS Diagnosis in Body Control Systems.

TURN-SIGNAL LIGHT FUNCTION
The turn-signal light function takes effect according to the following conditions.
1. Ignition switch: ON or ACC
2. Turn-signal light switch (RH or LH): ON

The turn-signal lights are controlled by the Simplified Wiring System (SWS). For troubleshooting, refer to SWS Diagnosis in Body Control Systems.

HAZARD WARNING LIGHT FUNCTION
The hazard warning light function takes effect by turning on the hazard warning light switch. The hazard warning lights are controlled by the Simplified Wiring System (SWS). For troubleshooting, refer to SWS Diagnosis in Body Control Systems.

FRONT COMBINATION LIGHT DIAGNOSIS
The taillights (position light) and turn-signal lights are controlled by the Simplified Wiring System (SWS). For troubleshooting, refer to SWS Symptom Procedures in Body Control Systems.