Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota 4Runner 1996-2003 Approved SIL techinfo.toyota.com ileaf ewdtmc2 ewdtmpdf ewdsourc 2002 024runne systemci 038srs
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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. This vehicle has power tilt and power
telescopic steering, power seat and power outside rear view mirror which are all equipped with memory function.
However, it is not possible to make a record of the memory contents. So when the work is finished, it will be necessary
to explain this fact tot the customer, and ask the customer to adjust the features and reset the memory. 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, pretensioner assembly, airbag sensor front
assembly or center 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, pretensioner assembly, airbag sensor front assembly and center 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, pretensioner assembly, airbag
sensor front assembly or center airbag sensor assembly in order to reuse it.
D If the steering wheel pad, front passenger airbag assembly, pretensioner assembly, airbag sensor front assembly or
center 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.
2002 4RUNNER (EWD471U)
153
SRS
FROM POWER SOURCE SYSTEM (SEE PAGE 48)
10A 10A
ECU- IG IGN
D1
4 1H 3 1L 11 1F DATA LINK CONNECTOR 1
GR- B
Y
J8 B AB TC
E A 5 A 5 11
CONNECTOR
SRS WARNING LIGHT
D7
JUNCTION
J7 A ,
DATA LINK CONNECTOR 3
C25 A , C28 D
P27 P28
GR
[COMB. METER]
L
PRETENSIONER LH PRETENSIONER RH
D B
5 II4 23 II4 SIL
GR- B 7
1 2 1 2 8 D
GR
W
L
CONNECTOR
CONNECTOR
L
JUNCTION
JUNCTION
B C
Y
C
J5 C
Y- B
Y- B
JUNCTION
J6
J6
Y
Y
CONNECTOR B C
C
GR
W
L
2 A 1 A 5 C 6 C 6 B 5 B 3 B 19 B 12 B
PL+ PL- PR+ PR- IG1 IG2 LA TC SIL
C20 A , C21 B , C22 C CENTER AIRBAG SENSOR ASSEMBLY
+SL - SL +SR - SR E1 D- D+ P- P+ E2
15 B 26 B 9 B 20 B 27 B 13 B 14 B 11 B 10 B 28 B
BR- Y
W- R
BR- W
B- W
Y- G
Y- R
P- B
Y- B
BR
BR
2 IG2 1 IG2
BR- Y
W- R
2 1 2 1 2 1
+SL - SL +SR - SR
SPIRAL
CABLE
2 1
A28 A29 A21 A20
AIRBAG SENSOR AIRBAG SENSOR AIRBAG SQUIB AIRBAG SQUIB
FRONT LH FRONT RH (STEERING WHEEL PAD) (FRONT PASSENGER
AIRBAG ASSEMBLY)
BR
BR
IG ID
2002 4RUNNER (EWD471U)
154
* 1 : W/ POWER SEAT
* 2 : W/O POWER SEAT
L- Y
C20 A , C21 B , C22 C
CENTER AIRBAG SENSOR
8 C ASSEMBLY
RBE+
L- Y
LBE+
11 A
W- R
4 IL1
3 3A
L- Y
(* 1)
1 3A
5 BU2
L- Y
(*2)
W- R
(* 1)
L- Y
W- R
3 BY2
(* 2)
(* 1)
2
W- R
(* 1)
1
B13 B19
BUCKLE SW BUCKLE SW
LH RH
2 3
W- B
W- B
(* 2)
6 12 16 (* 1)
W- B W- B W- B
BY2 3E 3E
(* 1) (*1)
W- B
(*2)
6 BU2
15
W- B A
3E J9 W- B
(*2) JUNCTION
CONNECTOR (* 1)
IF BJ
2002 4RUNNER (EWD471U)
155
SRS
SYSTEM OUTLINE
The SRS is a driver and front passenger protection device which has a supplemental role to the seat belts.
When the ignition SW is turned to ON position, the current from the ECU-IG, IGN fuse flows to the center airbag sensor
assembly TERMINAL IG1, IG2.
In case an accident occurs while driving, when the frontal impact exceeds a predetermined level, the current from the
ECU-IG or IGN fuse flows to center airbag sensor assembly TERMINALS D+, P+, PL+, PR+ to airbag squibs and
pretensioners to center airbag sensor assembly TERMINALS D-, P-, PL-, PR- to TERMINALS E1, E2 or BODY GROUND
to GROUND.
The current flows to the airbag squibs and pretensioners, and operates the airbag.
The airbag stored in the steering wheel pad is instantaneously expanded to soften the shock to the driver.
The airbag stored in the front passenger's instrument panel is instantaneously expanded to soften the shock to the front
passenger.
The pretensioners ensure the seat belt restrainability.
: PARTS LOCATION
Code See Page Code See Page Code See Page
A20 30 C20 A 30 J6 31
A21 30 C21 B 30 J7 A 31
A28 28 C22 C 30 J8 B 31
A29 28 C25 A 30 J9 31
32 (w/o Power Seat) C28 D 30 P27 33
B13
34 (w/ Power Seat) D1 28 P28 33
32 (w/o Power Seat) D7 30
B19
34 (w/ Power Seat) J5 31
,,,
,,, : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
,,,
Code See Page Junction Block and Wire Harness (Connector Location)
1F
1H 24 Cowl Wire and Driver Side J/B (Lower Finish Panel)
( )
1L
3A
26 Cowl Wire and Center J/B (Near the Steering Column Tube)
3E
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IG2 38 Engine Room Main Wire and Cowl Wire (Left Kick Panel)
II4 40 Engine Wire and Cowl Wire (On the Glove Box)
IL1 40 Cowl Wire and Floor Wire (Right Kick Panel)
BU2 44 Floor Wire and Seat No.2 Wire (Under the Front Passenger's Seat)
BY2 44 Cowl Wire and Seat No.1 Wire (Under the Driver's Seat)
: GROUND POINTS
Code See Page Ground Points Location
ID 38 Left Kick Panel
IF 38 Cowl Side Panel RH
IG 38 Right Kick Panel
BJ 42 Right Quarter Panel Inner
2002 4RUNNER (EWD471U)
156
MEMO
2002 4RUNNER (EWD471U)
157
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