Inspection Procedure

WARNING: This page is about a different car, the 2002 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

READ VALUE OF OBD II SCAN TOOL OR LEXUS HAND-HELD TESTER

Connect the LEXUS hand-held tester to the DLC3.
Check the light control switch using DATA LIST
OK:

Light control switch:

LIGHT CONTROL SWITCH INSPECTION

Switch name (Tester display)	No pressing	Pressing
Light control switch TAIL (TAIL LIGHT SW)	OFF	ON
Light control switch HEAD (HEAD LIGHT SW)	OFF	ON
Light control switch AUTO (LIGHT AUTO SW)	OFF	ON

Fog light switch:

FOG LIGHT SWITCH INSPECTION

Switch name (Tester display)	No pressing	Pressing
Front fog light switch (F FOG LIGHT SW)	OFF	ON

Headlight dimmer switch:

HEADLIGHT DIMMER SWITCH INSPECTION

Switch name (Tester display)	No pressing	Pressing
Light control switch Flash (PASSING SW)	OFF	ON
Light control switch HI (DIMMER HI SW)	OFF	ON

Turn signal and hazard warning switch:

TURN SIGNAL AND HAZARD WARNING SWITCH INSPECTION

Switch name (Tester display)	No pressing	Pressing
Turn signal switch Left (TURN LEFT SW)	OFF	ON
Turn signal switch Right (TURN RIGHT SW)	OFF	ON

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOM TABLE, SEE PROBLEM SYMPTOMS TABLE .
NG: REPLACE TURN SIGNAL SWITCH ASSEMBLY