Title: LIGHTING (EXT): LIGHTING SYSTEM: PROBLEM SYMPTOMS TABLE (2008 Sequoia)
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
Headlight System
Symptom
Suspected Area
See page
"Low beam" does not turn on (One side)
Headlight bulb (Low)
Headlight signal circuit
"Low beam" does not turn on (Both sides)
Light control switch circuit
Headlight signal circuit
Main body ECU
"High beam" does not turn on (One side)
Headlight bulb (High)
Headlight (HI-BEAM) circuit
"High beam" does not turn on (Both sides)
Light control switch circuit
Headlight (HI-BEAM) circuit
Main body ECU
"Flash" does not turn on (Low beam and Hi-beam are normal)
Light control switch circuit
Main body ECU
Headlight is dark
Headlight bulb
Taillight System
Symptom
Suspected Area
See page
Taillight does not turn on (All)
Light control switch circuit
Main body ECU (TAIL relay)
Taillight circuit
Front parking light does not turn on
Front parking light bulb
Taillight circuit
Main body ECU
Front side marker light does not turn on
Front side marker light bulb
Taillight circuit
Main body ECU
Taillight does not turn on
Taillight bulb
Rear combination light assembly
Taillight circuit
Main body ECU
License plate light does not turn on
License plate light bulb
Taillight circuit
Main body ECU
Light Auto Turn Off System
Symptom
Suspected Area
See page
Light auto turn off system does not operate
Light control switch circuit
Ignition switch (for 2UZ-FE)
Ignition switch (for 3UR-FE)
Door courtesy switch circuit
Main body ECU
Daytime Running Light System*1
Symptom
Suspected Area
See page
Daytime running light system does not operate (Turn signal light normal)
Ignition switch (for 2UZ-FE)
Ignition switch (for 3UR-FE)
Light control switch circuit
CAN communication system
Parking brake switch
DRL relay circuit
Main body ECU
Front Fog Light System
Symptom
Suspected Area
See page
Front fog light does not turn on (All)
Light control switch circuit
Front fog light circuit
Main body ECU
Only one front fog light does not turn on
Front fog light bulb
Front fog light circuit
Turn Signal and Hazard Warning System
Symptom
Suspected Area
See page
Turn signal does not turn on (All)
Headlight dimmer switch circuit
Turn signal light circuit
Turn signal flasher
Front turn signal light does not turn on
Front turn signal light bulb
Turn signal light circuit
Rear turn signal light does not turn on
Rear turn signal light bulb
Rear combination light assembly
Side turn signal light does not turn on*2
Side turn signal light
Outer rear view mirror assembly
Turn signal light circuit
Hazard warning light does not turn on (Turn signal light normal)
Hazard warning switch circuit
Turn signal flasher
Stop Light System
Symptom
Suspected Area
See page
Stop light does not turn on (All)
STOP fuse
Stop light switch
Harness and connector
-
Only one stop light does not turn on
Stop light bulb
Rear combination light assembly
Harness and connector
High mount stop light does not turn on
High mounted stop light assembly (w/ rear spoiler)
High mounted stop light assembly (w/o rear spoiler)
Harness and connector
-
Back-up Light System
Symptom
Suspected Area
See page
Back-up light does not turn on (All)
BK/UP LP fuse
Park/neutral position switch (for 2UZ-FE two wheel drive model)
Park/neutral position switch (for 2UZ-FE four wheel drive model)
Park/neutral position switch (for 3UR-FE two wheel drive model)
Park/neutral position switch (for 3UR-FE four wheel drive model)