Toyota FJ Cruiser (GSJ 10, 15 series). Manual - part 278

LIGHTING  –  LIGHTING SYSTEM

LI–9

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SYSTEM DESCRIPTION

1.

LIGHTING SYSTEM
(a) Illumination control system (Illuminated entry 

system):
When the doors are unlocked through a key or 
transmitter operation, or when a door is opened or 
closed, the illuminated entry system turns on the 
room light assembly.
(1) The main body ECU receives the following 

signal (A).
•

Door courtesy switch signal

•

Door detection switch signal

•

Ignition switch signal

(2) The main body ECU controls the following signal 

based on the signals listed in A.
•

Illumination operation signal

(3) The main body ECU controls the on/off and 

fade-in/fade-out operation of the following parts.
•

Room light assembly

(b) Battery saver system:

When the ignition switch is turned off and the any of 
the doors is open continuously for 30 minutes, the 
main body ECU turns the illumination operation 
signal off. As a result, the room light assembly, 
taillights, and the headlights turn off.
(1) The main body ECU receives the following 

signals (B).
•

Door courtesy switch signal

•

Ignition switch signal

(2) The main body ECU controls the following signal 

based on the signals listed in B (C).
•

Illumination operation signal

(3) The main body ECU controls the illumination 

period of the following parts based on the 
signals listed in C.
•

Room light assembly

•

Headlight (Low)

•

Position light (Front and Rear)

(c) Manual light control system:

This system functions when lights such as the 
headlights and taillights are illuminated through 
manual operation of the light control switch.
(1) The main body ECU receives the following 

signals (D).
•

Light control switch signal

•

Headlight dimmer switch signal

(2) The main body ECU controls the following 

signals based on the signals listed in D (E).
•

HEAD relay operation signal

•

TAIL relay operation signal

•

Running light relay assembly operation signal

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LIGHTING  –  LIGHTING SYSTEM

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(3) The main body ECU controls the on/off 

operation of the following parts based on the 
signals listed in E.
•

Headlight (Low)

•

Headlight (High)

•

Position light (Front and Rear)

(d) Light auto turn off system (for U. S. A):

With the light control switch in the TAIL or HEAD 
position, the headlights and taillights go off 30 
seconds after the ignition switch is turned off and all 
the doors are closed. However, when all the doors 
are locked using the door lock button, ignition key, 
or LOCK button on the transmitter, the headlights 
and taillights go off immediately.
Light auto turn off system (for Canada):
With the light control switch in the TAIL or HEAD 
position, the headlights and taillights go off 
immediately after the ignition switch is turned off 
and the driver door is opened.
(1) The main body ECU receives the following 

signals (F).
•

Door courtesy switch signal

•

Ignition switch signal

(2) The main body ECU controls the following 

signals based on the signals listed in F (G).
•

HEAD relay operation signal

•

TAIL relay operation signal

•

Running light relay assembly operation signal

(3) The main body ECU controls the illumination 

period of the following parts based on the 
signals listed in G.
•

Headlight (Low)

•

Headlight (High)

•

Position light (Front and Rear)

(e) Daytime running light system:

This system is directly connected to the low-beam 
headlights and is designed to automatically activate 
the daytime running lights in order to increase the 
visibility of the vehicle.
(1) The main body ECU receives the following 

signals (I).
•

Ignition switch signal

•

Generator signal

•

Parking brake switch signal

•

Light control switch signal

(2) The main body ECU controls the following signal 

based on the signals listed in I.
•

Running light relay assembly operation signal

(3) The main body ECU controls the on/off 

operation of the following part.
•

Headlight (Low)

LIGHTING  –  LIGHTING SYSTEM

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HOW TO PROCEED WITH 
TROUBLESHOOTING

HINT:
•

Use these procedures to troubleshoot the lighting system.

•

*: Use the intelligent tester.

NEXT

NEXT

Standard voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace battery 
before proceeding.

NEXT

(a) Use the intelligent tester to check if the Multiplex 

Communication System (MPX) is functioning normally.
Result

B

A

Result

B

1

VEHICLE BROUGHT TO WORKSHOP

2

CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK

3

INSPECT BATTERY VOLTAGE

4

INSPECT COMMUNICATION FUNCTION OF LARGE-SCALE MULTIPLEX 
COMMUNICATION SYSTEM (BEAN)*

Result

Proceed to

MPX DTC is not output

A

MPX DTC is output

B

GO TO MULTIPLEX COMMUNICATION 
SYSTEM

5

PROBLEM SYMPTOMS TABLE

Result

Proceed to

If fault is not listed in problem symptoms table

A

If fault is listed in problem symptoms table

B

Go to step 7

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LIGHTING  –  LIGHTING SYSTEM

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A

(a) Terminals of ECU (see page 

LI-15

)

(b) DATA LIST / ACTIVE TEST (see page 

LI-18

)

NEXT

NEXT

NEXT

6

OVERALL ANALYSIS AND TROUBLESHOOTING*

7

REPAIR OR REPLACE

8

CONFIRMATION TEST

END