Source Voltage Drop - Toyota T100 1996 Service Manual

DI−396
DTC Normal
CIRCUIT DESCRIPTION
The SRS is equipped with a voltage−increase circuit (DC−DC converter) in the center airbag sensor assem-
bly in case the source voltage drops.
When the battery voltage drops, the voltage−increase circuit (DC−DC converter) functions to increase the
voltage of the SRS to normal voltage.
The diagnosis system malfunction display for this circuit is different to other circuits−when the SRS warning
light remains lit up and the DTC is a normal code, source voltage drop is indicated.
Malfunction in this circuit is not recorded in the center airbag sensor assembly, and the source voltage re-
turns to normal, after approx. 10 seconds the SRS warning light automatically goes off.
DTC No.
(Normal)
WIRING DIAGRAM
5
2
W
2
2
1
2
R−L
Battery
1996 TOYOTA T100 (RM449U)
DIAGNOSTICS

Source Voltage Drop

6 14
W W
2
IA3
3
8
4
W−R
W−R
2
IA3
8
R/B No.2
3
2
− SUPPLEMENTAL RESTRAINT SYSTEM
4
CIG
2
1A
L−R
Integration
Relay
IGN
7
1A
B−R
3
Ignition J/B No.1
Switch
Diagnosis
Source voltage drop
GR−R GR−R
4 4
B−Y
3 3
1C
17
Short
Connector
Center Airbag
Sensor Assembly
DI989−01
ACC
16
B−Y
IG2
15
R15204