Problem Symptoms Table

WARNING: This page is about a different car, the 2003 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.

HEADLIGHT AND TAILLIGHT

Symptom/Suspect Area

See

Only One Headlight Comes On.

Bulb

.....

HEAD LH Fuse (LWR, UPR)

.....

HEAD RH Fuse (LWR, UPR)

.....

Wire Harness

.....

LO-Beam Does Not Light (All).

MAIN Fuse

.....

Wire Harness

.....

Head Lamp Relay

⁽¹⁾

HI-Beam Does Not Light (All).

Headlight Dimmer Switch

⁽²⁾

DRL No. 2, No. 3, No. 4 Relay

⁽³⁾

Wire Harness

.....

HI-Beam Does Not Light (One Side).

Bulb

.....

Wire Harness

.....

Flash Does Not Light

Headlight Dimmer Switch

⁽²⁾

DRL No. 2, No. 3, No. 4 Relay

⁽³⁾

Wire Harness

.....

Headlight Is Dark

Bulb

.....

Wire Harness

.....

Only One Taillight Comes On

Bulb

.....

Wire Harness

.....

Taillight Does Not Come On (Headlight Is Normal)

TAIL Fuse

.....

Taillight Control Relay

⁽⁴⁾

Light Control Switch

⁽⁵⁾

Wire Harness

.....

Taillight Does Not Come On (Headlight Does Not Light)

Light Control Switch

⁽⁵⁾

Wire Harness

.....

Rear Combination Light Does Not Come On

Bulb

.....

Wire Harness

.....

Headlight Does Not Come On With Engine Running And Light Control Switch In OFF

Head Lamp Relay

⁽¹⁾

Daytime Running Light Relay No. 2, 3, 4 Relay

⁽³⁾

Generator L Terminal

.....

Parking Brake Switch

.....

Multiplex Network Body ECU

⁽⁶⁾

Wire Harness

.....

⁽¹⁾	See . HEADLAMP RELAY

⁽²⁾	See . HEADLAMP DIMMER SWITCH ASSY (W/ FOG LIGHT)

⁽³⁾	See . DAY TIME RUNNING LIGHT RELAY NO. 2

⁽⁴⁾	See . TAIL LAMP RELAY

⁽⁵⁾	See . INSPECT LIGHT CONTROL SWITCH CONTINUITY.

⁽⁶⁾	See . INSPECT AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT

AUTOMATIC LIGHT CONTROL SYSTEM

Symptom/Suspect Area

See

Automatic Light Control System Does Not Operate

Automatic Light Control Sensor

⁽¹⁾

Light Control Switch

⁽²⁾

Door Courtesy Switch

⁽³⁾

Multiplex Network Body ECU

⁽⁴⁾

Wire Harness

.....

⁽¹⁾	See . AUTOMATIC LIGHT CONTROL SYSTEM OPERATION CHECK (AUTO ON)

⁽²⁾	See . INSPECT LIGHT CONTROL SWITCH CONTINUITY.

⁽³⁾	See . FRONT DOOR COURTESY LAMP SWITCH ASSY

⁽⁴⁾	See . INSPECT AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT

LIGHT AUTO CUT SYSTEM

Symptom/Suspect Area

See

Auto Turn Off System Does Not Operate When Driver's Door Is Opened

Driver Door Courtesy Switch

⁽¹⁾

Multiplex Network Body ECU

⁽²⁾

Headlight And Taillight Does Not Come On

Multiplex Network Body ECU

⁽²⁾

Wire Harness

.....

Headlight And Taillight Stays On

Multiplex Network Body ECU

⁽²⁾

Wire Harness

.....

⁽¹⁾	See . FRONT DOOR COURTESY LAMP SWITCH ASSY

⁽²⁾	See . INSPECT AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT

FOG LIGHT SYSTEM

Symptom/Suspect Area

See

Front Fog Light Does Not Light Up With Control SW HEAD (Headlight Is Normal

FOG Fuse

.....

Fog Light Relay

⁽¹⁾

Fog Light Switch

⁽²⁾

Wire Harness

.....

Multiplex Network Body ECU

⁽²⁾

Only One Front Fog Light Does Not Light Up

Bulb

.....

Wire Harness

.....

⁽¹⁾	See . FOG LAMP RELAY

⁽²⁾	See . INSPECT AUTOMATIC LIGHT CONTROL SENSOR CIRCUIT

TURN SIGNAL AND HAZARD WARNING SYSTEM

Symptom/Suspect Area

See

"Hazard" And "Turn" Do Not Light Up

IG1 Fuse

.....

HAZ Fuse

.....

Ignition Switch

.....

Turn Signal Flasher Relay

⁽¹⁾

Wire Harness

.....

Hazard Warning Light Does Not Light Up (Hazard Is Normal)

Hazard Warning Switch (A/C Control Assembly

⁽²⁾

Wire Harness

.....

Turn Signal Does Not Light Up (Hazard Is Normal)

Turn Signal Switch

⁽³⁾

Wire Harness

.....

Turn Signal Does Not Light Up In One Direction

Turn Signal Switch

⁽³⁾

Wire Harness

.....

Only One Bulb Does Not Light Up

Bulb

.....

Wire Harness

.....

⁽¹⁾	See . INSPECT TURN SIGNAL FLASHER CIRCUIT

⁽²⁾	See . CIRCUIT ASSY, SWITCH

⁽³⁾	See . INSPECT TURN SIGNAL SWITCH CONTINUITY.

INTERIOR LIGHT SYSTEM

Symptom/Suspect Area

See

All The Lights Do Not Come ON

DOME Fuse

.....

The Light Does Not Come On When The Driver's Door Is Opened

Driver's Door Courtesy Switch

⁽¹⁾

Wire Harness

.....

The Light Does Not Come ON When The Passenger's Door Is Opened

Passenger's Door Courtesy Switch

⁽¹⁾

Wire Harness

.....

The Light Does Not Come On When The Rear-Right Door Is Opened

Rear-Right Door Courtesy Switch

⁽²⁾

Wire Harness

.....

The Light Does Not Come On When The Rear-Left Door Is Opened

Rear-Left Door Courtesy Switch

⁽²⁾

Wire Harness

.....

Only One Of The Bulbs Comes ON

Bulb

.....

The Illumination Does Not Fade Out When All The Doors Are Closed

Courtesy Switch

⁽³⁾

Wire Harness

.....

Multiplex Network Body ECU

.....

The Illumination Does Not Fade Out Immediately When The Ignition Switch Is Turned To ACC Or ON Within 15 Seconds After All The Doors Are Closed

Ignition Switch

.....

IG1 Fuse

.....

Multiplex Network Body ECU

⁽³⁾

Wire Harness

.....

⁽¹⁾	See . FRONT DOOR COURTESY LAMP SWITCH ASSY

⁽²⁾	See . REAR DOOR COURTESY LAMP SWITCH ASSY

⁽³⁾	See . SWITCH, COURTESY LAMP