Lexus SC300 / Lexus SC400. Manual — part 1014
179
3. CONNECTOR TWIN–LOCK MECHANISM
With this mechanism connectors (male and female
connectors) are locked by two locking devices to increase
connection reliability. If the primary lock is incomplete, ribs
interfere and prevent the secondary lock.
180
SRS AIRBAG
1G
10
1G
6
1G
1
1E
13
10
11
IK1
10
IK1
23
IK1
1
4
+SL
5
–SL
3
+SR
2
–SR
11
D+
10
D–
13
E1
8
E2
3
E1
3
E1
7
IG2
14
ACC
6
+B
12
AB
4
TC
11
TC
5
AB
1
2
1
2
1
2
7. 5A
IGN
15A
CIG
15A
ECU–B
FROM ENGINE AND
ECT ECU (E1)
CHECK
CONNECTOR
TDCL
FRONT AIRBAG
SENSOR LH
FRONT AIRBAG
SENSOR RH
AIRBAG SQUIB
SPIRAL
CABLE
CENTER AIRBAG SENSOR ASSEMBLY
BR
W–
B
W–
B
L
Y
B
GR
W
R
L
Y
B
GR
W
R
BR
W–
B
BR
BR
BR
B–
Y
P–
B
P–
B
B–
Y
P–
B
B–
Y
B–
Y
W
–
R
W–
R
L–
R
B–
O
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
AIRBAG WARNING
LIGHT
[COMB. METER]
C10
F 1
F 2
A29
C 3
T 6
C12
E20
1G
9
9
12
IF
ED
1G
7
EC
LA
TC
1E
4
1E
3
3B
2
3H
12
3E
3
3E
10
1J
1
3A
3
1G
4
1G
3
3A
7
3D
11
B–
Y
P–
B
B–
Y
P–
B
B–
Y
W–
B
181
THE SRS (SUPPLEMENTAL RESTRAINT SYSTEM) AIRBAG IS A DRIVER PROTECTION DEVICE WHICH HAS A SUPPLEMENTAL ROLE
TO THE SEAT BELTS.
CURRENT FLOWS CONSTANTLY TO TERMINAL 6 OF THE CENTER AIRBAG SENSOR ASSEMBLY. WHEN THE IGNITION SW IS
TURNED TO ACC OR ON, CURRENT FROM THE CIG FUSE FLOWS TO TERMINAL 14 OF THE CENTER AIRBAG SENSOR ASSEMBLY.
ONLY WHEN THE IGNITION SW IS ON DOES THE CURRENT FROM THE IGN FUSE TO TERMINAL 7.
IF AN ACCIDENT OCCURS WHILE DRIVING, DECELERATION CAUSED BY A FRONTAL IMPACT IS DETECTED BY EACH SENSOR AND
SWITCH, AND WHEN THE FRONTAL IMPACT EXCEEDS A SET LEVEL (WHEN THE SAFING SENSOR BUILT INTO THE CENTER AIRBAG
SENSOR ASSEMBLY IS ON AND THE CENTER AIRBAG SENSOR IS ON, FRONT AIRBAG SENSORS ARE OFF), CURRENT FROM THE
CIG OR IGN FUSE FLOWS TO TERMINAL 11 OF THE CENTER AIRBAG SENSOR ASSEMBLY
→
TERMINAL 1 OF THE AIRBAG SQUIB
→
SQUIB
→
TERMINAL 2
→
TERMINAL 10 OF CENTER AIRBAG SENSOR ASSEMBLY
→
TERMINAL 8, TERMINAL 13 OR BODY GROUND
→
GROUND.
WHEN THE SAFING SENSOR BUILT INTO THE CENTER AIRBAG SENSOR ASSEMBLY IS ON AND THE FRONT AIRBAG SENSOR LH OR
RH IS ON, CENTER AIRBAG SENSOR IS OFF AND CURRENT FROM THE CIG OR IGN FUSE FLOWS TO TERMINAL 11 OF THE CENTER
AIRBAG SENSOR ASSEMBLY
→
TERMINAL 1 OF THE AIRBAG SQUIB
→
SQUIB
→
TERMINAL 2
→
TERMINAL 10 OF CENTER AIRBAG
SENSOR ASSEMBLY
→
TERMINAL 3 OR 4
→
TERMINAL 1 OF FRONT AIRBAG SENSOR
→
TERMINAL 2
→
TERMINAL 2 OR 5 OF
CENTER AIRBAG SENSOR ASSEMBLY
→
TERMINAL 8, TERMINAL 13 OR BODY GROUND
→
GROUND, WHEN THE SAFING SENSOR
BUILT INTO THE CENTER AIRBAG SENSOR ASSEMBLY IS ON, AND THE FRONT AIRBAG SENSOR LH OR RH IS ON AND CENTER
AIRBAG SENSOR IS ON ONE OF THE ABOVE–MENTIONED CIRCUITS IS ACTIVATED SO THAT CURRENT FLOWS TO THE AIRBAG
SQUIB AND CAUSES IT TO OPERATE. THE BAG STORED INSIDE THE STEERING WHEEL PAD IS INSTANTANEOUSLY EXPANDED TO
SOFTEN THE SHOCK TO THE DRIVER.
: PARTS LOCATION
CODE
SEE PAGE
CODE
SEE PAGE
CODE
SEE PAGE
A29
C12
T 6
C 3
F 1
C10
F 2
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODE
SEE PAGE
JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1E
INSTRUMENT PANEL WIRE
1G
COWL NO. 2 WIRE
1J
COWL WIRE
3A
3B
3D
INSTRUMENT PANEL WIRE
3E
3H
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODE
SEE PAGE
JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IK1
ENGINE WIRE AND INSTRUMENT PANEL WIRE (RIGHT KICK PANEL)
: GROUND POINTS
CODE
SEE PAGE
GROUND POINTS LOCATION
EC
FRONT SIDE OF INTAKE MANIFOLD
ED
REAR SIDE OF CYLINDER HEAD RH
IF
LEFT KICK PANEL
: SPLICE POINTS
CODE
SEE PAGE
WIRE HARNESS WITH SPLICE POINTS
CODE
SEE PAGE
WIRE HARNESS WITH SPLICE POINTS
E20
ENGINE WIRE
SYSTEM OUTLINE
182
SRS AIRBAG
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