Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 436

SEAT BELT  –  SEAT BELT WARNING SYSTEM

SB–11

SB

HOW TO PROCEED WITH 
TROUBLESHOOTING

HINT:
•

Use these procedures to troubleshoot the seat belt 
warning system.

NEXT

Standard voltage:

11 to 14 V

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

NEXT

Result:

B

A

(a) DATA LIST / ACTIVE TEST (see page 

SB-20

)

(b) Terminals of ECU (see page 

SB-12

)

NEXT

NEXT

1

VEHICLE BROUGHT TO WORKSHOP

2

INSPECT BATTERY VOLTAGE

3

PROBLEM SYMPTOMS TABLE

Result

Proceed to

Fault is not listed in problem symptoms 

table

A

Fault is listed in problem symptoms 

table

B

GO TO STEP 5

4

OVERALL ANALYSIS AND TROUBLESHOOTING

5

REPAIR OR REPLACE

SB–12

SEAT BELT  –  SEAT BELT WARNING SYSTEM

SB

NEXT

6

CONFIRMATION TEST

END

SEAT BELT  –  SEAT BELT WARNING SYSTEM

SB–13

SB

PROBLEM SYMPTOMS TABLE

HINT:
Use the table below to help determine the causes of the 
problem symptom. 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.

Seat belt warning system

Symptom

Suspected area

See page

Front driver seat belt warning light does not operate

Front seat inner belt assembly (Driver side)

SB-32

Wire harness

SB-22

Combination meter assembly

SB-22

Front passenger seat belt warning light does not 
operate

Front seat inner belt assembly (Passenger side)

SB-25

Wire harness

SB-25

Occupant classification ECU

SB-25

Center airbag sensor assembly

SB-25

Combination meter assembly

SB-25

Air conditioning amplifier

-

Integration control and panel assembly (Front passenger seat 
belt warning light)

SB-2

Seat belt warning buzzer does not sound (Front driver 
and front passenger seat belt warning lights operate 
normally)

Combination meter assembly

ME-15

SB–14

SEAT BELT  –  SEAT BELT WARNING SYSTEM

SB

TERMINALS OF ECU

1.

COMBINATION METER ASSEMBLY

(a) Disconnect the E13 combination meter assembly 

connector.

(b) Measure the voltage and resistance of the wire 

harness side connector.

Standard:

If the result is not as specified, there may be a 
malfunction in the wire harness.

(c) Reconnect the combination meter assembly 

connector.

(d) Measure the voltage of the wire harness side 

connector.

Standard:

If the result is not as specified, there may be a 
malfunction in the wire harness.

E14

E13

E125398E02

Symbols (Terminals No.)

Wiring Color

Terminal Description

Condition

Specified Condition

E13-1 (B) - Body ground

R - Body ground

Battery

Always

11 to 14 V

E13-2 (IG+) - Body ground

R-L - Body ground

Ignition switch signal

Ignition switch OFF 

→ ON

Below 1 V 

→ 11 to 14 V

E13-21 (ES) - Body 

ground

W-B - Body ground

Ground

Always

Below 1 

Ω

Symbols (Terminal No.)

Wiring Color

Terminal Description

Condition

Specified Condition

E13-7 (WRNP) - Body 

ground

LG - Body ground

Seat belt warning light 

signal (Front passenger 

side)

Ignition switch ON

Front passenger seat is 

occupied and its seat belt 

is unfastened

Alternating between 11 to 

14 V and below 3 V

E13-7 (WRNP) - Body 

ground

LG - Body ground

Seat belt warning light 

signal (Front passenger 

side)

Ignition switch ON

Front passenger seat is 

occupied and its seat belt 

is fastened

Below 1 V

E13-8 (L) - Body ground

G-Y - Body ground

Front seat inner belt signal 

(Front driver side)

Ignition switch ON

Front seat belt is 

unfastened (Front driver 

side)

Below 1 V

E13-8 (L) - Body ground

G-Y - Body ground

Front seat inner belt signal 

(Front driver side)

Ignition switch ON

Front seat belt is fastened 

(Front driver side)

9 to 14 V

E13-10 (PBKL) - Body 

ground

L-R - Body ground

Front seat inner belt signal 

(Front passenger side)

Ignition switch ON

Front seat belt is 

unfastened (Front 

passenger side)

Below 1 V

E13-10 (PBKL) - Body 

ground

L-R - Body ground

Front seat inner belt signal 

(Front passenger side)

Ignition switch ON

Front seat belt is fastened 

(Front passenger side)

8 to 14 V