Toyota Pet Fence EWD517U User Manual

SRS  
NOTICE: When inspecting or repairing the SRS, perform the operation in accordance with the following precautionary  
instructions and the procedure and precautions in the Repair Manual for the applicable model year.  
D Malfunction symptoms of the SRS are difficult to confirm, so the DTCs become the most important source of information  
when troubleshooting. When troubleshooting the SRS, always inspect the DTCs before disconnecting the battery.  
D Work must be started after 90 seconds from when the ignition switch is turned to the ”LOCK” position and the  
negative (–) terminal cable is disconnected from the battery.  
(The SRS is equipped with a back–up power source so that if work is started within 90 seconds from  
disconnecting the negative (–) terminal cable of the battery, the SRS may be deployed.)  
D When the negative (–) terminal cable is disconnected from the battery, the memory of the clock and audio system will be  
canceled. So before starting work, make a record of the contents memorized in the audio memory system. When work is  
finished, reset the audio systems as they were before and adjust the clock. To avoid erasing the memory in each  
memory system, never use a back–up power supply from outside the vehicle.  
D Before repairs, remove the airbag sensor if shocks are likely to be applied to the sensor during repairs.  
D Do not expose the steering wheel pad, front passenger airbag assembly, seat belt pretensioner, center airbag sensor  
assembly or front airbag sensor assembly directly to hot air or flames.  
D Even in cases of a minor collision where the SRS does not deploy, the steering wheel pad, front passenger airbag  
assembly, seat belt pretensioner, center airbag sensor assembly and front airbag sensor assembly should be inspected.  
D Never use SRS parts from another vehicle. When replacing parts, replace them with new parts.  
D Never disassemble and repair the steering wheel pad, front passenger airbag assembly, seat belt pretensioner, center  
airbag sensor assembly or front airbag sensor assembly in order to reuse it.  
D If the steering wheel pad, front passenger airbag assembly, seat belt pretensioner, center airbag sensor assembly or  
front airbag sensor assembly has been dropped, or if there are cracks, dents or other defects in the case, bracket or  
connector, replace them with new ones.  
D Use a volt/ohmmeter with high impedance (10 k/V minimum) for troubleshooting the system’s electrical circuits.  
D Information labels are attached to the periphery of the SRS components. Follow the instructions on the notices.  
D After work on the SRS is completed, perform the SRS warning light check.  
D If the vehicle is equipped with a mobile communication system, refer to the precaution in the IN section of the Repair  
Manual.  
157  
2003 TOYOTA TACOMA (EWD517U)  
 
 
(
)
FROM POWER SOURCE SYSTEM SEE PAGE 54  
* 1 : DOUBLE CAB  
* 2 : EXCEPT DOUBLE CAB  
10A  
GAUGE  
5
1F  
Y
19 3D  
20 3D  
5
A
3
1
3F  
3F  
C10  
, C12  
A
C
COMBINATION  
METER  
2
11  
C
LBE+  
B 6  
BUCKLE  
SW LH  
P+  
B
P–  
4
C
1 C  
1
10  
11  
B
18 3A  
16 3A  
20 3F  
16 3F  
2
1
I 9  
A21  
AIRBAG SQUIB  
(
FRONT PASSENGER  
)
AIRBAG ASSEMBLY  
IE  
IG  
159  
2003 TOYOTA TACOMA (EWD517U)  
 
 
SRS  
SYSTEM OUTLINE  
The SRS is a driver protection device which has a supplemental role to the seat belts.  
When the ignition SW is turned to ACC or ON, the current from the ACC fuse flows to TERMINAL (B) 6 of the center airbag  
sensor assembly. Only when the ignition SW on, the current from the IGN fuse flows to TERMINAL (B) 5 of the center airbag  
sensor assembly.  
If an accident occurs while driving, deceleration caused by a frontal impact is detected (by sensor) and when the frontal  
impact exceeds a set level, the current from the ACC or IGN fuse flows to TERMINALS (B) 6 or (B) 5 of the center airbag  
sensor assembly. This current flows to TERMINAL (B) 14 to TERMINAL 1 of the airbag squib (Steering wheel pad) to  
TERMINAL 2 to TERMINAL (B) 13 of the center airbag sensor assembly, and also flows to TERMINAL (B) 10 of the center  
airbag sensor assembly to TERMINAL 2 of the airbag squib (Front passenger airbag assembly) to TERMINAL 1 of the  
center airbag assembly (Double cab) or TERMINAL (B) 10 of the center airbag sensor assembly to TERMINAL 1 of the  
passenger airbag manual on/off SW to TERMINAL 3 to TERMINAL 1 of the airbag squib (Front passenger airbag assembly)  
to TERMINAL 2 to TERMINAL 2 of the passenger airbag manual on/off SW to TERMINAL 4 to TERMINAL (B) 11 of the  
center airbag sensor assembly (Except double cab). Furthermore, the current flows to TERMINAL (B) 27 or (B) 28 to  
GROUND, causing the center airbag squibs to expand.  
When the safing sensor built into the center airbag sensor assembly is on, airbag sensor is off and the current from the ACC  
or IGN fuse flows same as above–mentioned flowing, causing the airbag squibs to expand. When the safing sensor built into  
the center airbag sensor assembly is on, the airbag sensor on one of the above-mentioned circuits is activated so that  
current flows to the airbag squibs and causes them to operate.  
The airbag stored inside the steering wheel pad is instantaneously expanded to soften the shock to the driver.  
The airbag stored inside the passenger’s instrument panel is instantaneously expanded to soften the shock to the  
passenger.  
1. FRONT PASSENGER AIRBAG MANUAL ON/OFF OPERATION (EXCEPT DOUBLE CAB)  
When the passenger airbag manual on/off SW is on, the current flowing from the ACC or IGN fuse to the airbag squib (Front  
passenger airbag assembly) is same as above, causing the airbag squib (Front passenger airbag assembly) to expand in an  
accident.  
If the passenger airbag manual on/off SW is turned to off, the current flows from the ACC fuse to TERMINAL 1 of the  
passenger airbag manual on/off indicator to TERMINAL 2 to GROUND, lighting the indicator up. Then the current between  
TERMINAL (B) 11 of the airbag sensor assembly and the airbag squib (Front passenger airbag assembly) is cut off, so that it  
does not expand the airbag squib (Front passenger airbag assembly) in an accident.  
: PARTS LOCATION  
Code  
A18  
See Page  
Code  
C21  
C22  
See Page  
Code  
J11  
See Page  
B
C
A21  
P19  
P20  
D7  
B6  
F9  
P21  
P22  
C10  
A
C
A
C12  
C20  
F10  
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR  
Code  
See Page  
Junction Block and Wire Harness (Connector Location)  
1F  
1G  
1M  
3A  
3D  
3F  
3G  
3H  
Cowl Wire and J/B No.1 (Lower Finish Panel)  
Cowl Wire and J/B No.3 (Behind the Instrument Panel Left)  
Cowl Wire and J/B No.3 (Behind the Instrument Panel Center)  
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS  
Code  
IF3  
See Page  
Joining Wire Harness and Wire Harness (Connector Location)  
Engine Room Main Wire and Cowl Wire (Left Kick Panel)  
160  
2003 TOYOTA TACOMA (EWD517U)  
 
 
: GROUND POINTS  
Code  
ID  
See Page  
Ground Points Location  
Left Kick Panel  
IE  
Around the Right Edge of the Reinforcement  
Around the Left Edge of the Reinforcement  
Right Kick Panel  
IG  
IH  
: SPLICE POINTS  
Code  
I9  
See Page  
Wire Harness with Splice Points  
Cowl Wire  
Code  
See Page  
Wire Harness with Splice Points  
161  
2003 TOYOTA TACOMA (EWD517U)  
 
 

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