Problem Symptoms Tables

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

HEADLIGHT & TAILLIGHT SYSTEM PROBLEM SYMPTOMS INDEX

Symptom	Suspect Area	Refer To
"LO-beam" headlight does not light up.	Light control switch circuit Headlight relay circuit Combination switch Driver side J/B ECU	Light Control Switch Circuit See HEADLIGHT RELAY CIRCUIT under CIRCUIT INSPECTION in DRIVE SIDE JUNCTION BLOCK (BODY NO. 2) CONTROL SYSTEM - DIAGNOSTICS - LS 430 article.
"HI-beam" headlight does not light up.	Headlight (HI-beam) circuit Light control switch circuit Combination switch Front light ECU Driver side J/B ECU	See HEADLIGHT CIRCUIT under CIRCUIT INSPECTION in FRONT LIGHT (BODY NO. 5) CONTROL SYSTEM - DIAGNOSTICS - LS 430 article. Light Control Switch Circuit
"Flash" headlight does not light up.	Headlight (HI-beam) circuit Light control switch circuit Combination switch Front light ECU Driver side J/B ECU	See HEADLIGHT CIRCUIT under CIRCUIT INSPECTION in FRONT LIGHT (BODY NO. 5) CONTROL SYSTEM - DIAGNOSTICS - LS 430 article. Light Control Switch Circuit
Headlight is dark.	Light control switch circuit Combination switch Driver side J/B ECU	Light Control Switch Circuit Light Control Switch Circuit
Headlight does not light up or has abnormal operation.	Light control switch circuit Combination switch Driver side J/B ECU	Light Control Switch Circuit
Taillight does not light up or has abnormal operation.	Taillight circuit Light control switch circuit Combination switch Luggage room J/B ECU Driver side J/B ECU	See TAILLIGHT CIRCUIT in LUGGAGE ROOM JUNCTION BLOCK (BODY NO. 4) CONTROL SYSTEM - DIAGNOSTICS - LS 430 article. Light Control Switch Circuit

FOG LIGHT SYSTEM PROBLEM SYMPTOMS INDEX

Symptom	Suspect Area	Refer To
Fog light does not light up or has abnormal operation.	Front fog light circuit Light control switch circuit Combination switch Front light ECU Driver side J/B ECU	See FRONT FOG LIGHT CIRCUIT under CIRCUIT INSPECTION in FRONT LIGHT (BODY NO. 5) CONTROL SYSTEM - DIAGNOSTICS - LS 430 article. Light Control Switch Circuit

TURN SIGNAL LIGHT SYSTEM PROBLEM SYMPTOMS INDEX

Symptom	Suspect Area	Refer To
Turn signal light does not light up.	Turn signal light circuit Light control switch circuit Combination switch Front light ECU Driver side J/B ECU	Power Source Circuit Light Control Switch Circuit

WIPER SYSTEM PROBLEM SYMPTOMS INDEX

Symptom	Suspect Area	Refer To
Wiper system does not operate.	Wiper and washer switch circuit Wiper switch (HI) circuit Wiper motor circuit Combination switch Passenger side J/B control ECU	WIPER & Washer Switch Circuit See WIPER SWITCH (HI SPEED) CIRCUIT under CIRCUIT INSPECTION in PASSENGER SIDE JUNCTION BLOCK (BODY NO. 3) CONTROL SYSTEM - DIAGNOSTICS - LS 430 article. See WIPER MOTOR CIRCUIT under CIRCUIT INSPECTION in PASSENGER SIDE JUNCTION BLOCK (BODY NO. 3) CONTROL SYSTEM - DIAGNOSTICS - LS 430 article. See WIPER MOTOR CIRCUIT under CIRCUIT INSPECTION in PASSENGER SIDE JUNCTION BLOCK (BODY NO. 3) CONTROL SYSTEM - DIAGNOSTICS - LS 430 article.

WASHER SYSTEM PROBLEM SYMPTOMS INDEX

Symptom	Suspect Area	Refer To
Washer system does not operate.	Wiper and washer switch circuit Washer motor circuit Combination switch Passenger side J/B control ECU	WIPER & Washer Switch Circuit See WIPER MOTOR CIRCUIT under CIRCUIT INSPECTION in PASSENGER SIDE JUNCTION BLOCK (BODY NO. 3) CONTROL SYSTEM - DIAGNOSTICS - LS 430 article.

POWER TILT & TELESCOPIC STEERING SYSTEM PROBLEM SYMPTOMS INDEX

Symptom	Suspect Area	Refer To
Both tilt and telescopic: Only tilt and telescopic manual switch function does not operate.	Tilt and telescopic manual switch circuit Tilt and telescopic steering ECU	See STEERING PAD SWITCH SYSTEM - DIAGNOSTICS - LS 430 article.
Tilt only: Only tilt and telescopic manual switch function does not operate.	Tilt and telescopic manual switch circuit Tilt and telescopic steering ECU	See STEERING PAD SWITCH SYSTEM - DIAGNOSTICS - LS 430 article.
Telescopic only: Only tilt and telescopic manual switch function does not operate.	Tilt and telescopic manual switch circuit Tilt and telescopic steering ECU	See STEERING PAD SWITCH SYSTEM - DIAGNOSTICS - LS 430 article.