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DI-456
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
DI18Z-33
DTC Normal Source Voltage Drop
CIRCUIT DESCRIPTION
The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag sensor assembly 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 from other circuits that is 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 airbag sensor assembly, and the source voltage returns to
normal, the SRS warning light automatically goes off.
DTC No. Diagnosis
(Normal) Source voltage drop
WIRING DIAGRAM
Airbag Sensor
I14 Driver Side J/B Assembly
Ignition Switch J/C
2 ECU-IG 4 E D 6
B-Y Y Y
1I 1H J7 J8 C21 IG1
2 AM1 IG1 4
4 IGN 3 5
B-R GR-B
1I 1L C21 IG2
7 AM2 IG2 6
Engine Room R/B 28
AM2 C21 E2
W-R
2 27
2 1 C21 E1
AM1
W
2 2
2 1 2 1 BR BR
W
ID IG
Battery
H17125
2002 4RUNNER (RM887U)
Author : Date : 632
DI-457
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
INSPECTION PROCEDURE
1 Prepare for inspection.
LOCK PREPARATION:
Airbag
Sensor (a) Disconnect negative (-) terminal cable from the battery,
Assembly and wait at least for 90 seconds.
P/T Squib (LH) (b) Remove the steering wheel pad. (See page SR-13 )
(c) Disconnect the connector of the front passenger airbag
assembly. (See page RS-25 )
P Squib (d) Disconnect the connectors of the seat belt pretensioner
RH and LH. (See page BO-121 )
D Squib (e) Disconnect the connectors of the airbag sensor assem-
Spiral
Cable bly. (See page RS-38 )
(f) Disconnect the connectors of the front airbag sensor RH
Front Airbag and LH. (See page RS-43 )
Sensor (LH)
CAUTION:
Front Airbag Store the steering wheel pad with the front surface facing
Sensor (RH) upward.
AB0117 P/T Squib (RH)
H07389
N H07390
2002 4RUNNER (RM887U)
Author : Date : 633
DI-458
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
2 Check source voltage.
Airbag Sensor Assembly PREPARATION:
ON (a) Connect negative (-) terminal cable to the battery.
(b) Turn ignition switch to ON.
CHECK:
ACC IG2 Operating electric system (defogger, wiper, headlight, heater
(-) (+) blower, etc.), measure the voltage between each of IG2 and
ACC of sensor and body ground.
OK:
AB0119
H01298 H01299 Voltage: 10 - 14 V
NG Check harness between battery and airbag sen-
sor assembly, and check battery and charging
system.
OK
3 Does SRS warning light turn OFF?
ON
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Connect the steering wheel pad connector.
(c) Connect the front passenger airbag assembly connector.
(d) Connect the seat belt pretensioner connector RH and LH.
(e) Connect the airbag sensor assembly connector.
(f) Turn ignition switch to ON.
CHECK:
H01249 Operate electric system (defogger, wiper, headlight, heater
blower, etc.) and check that SRS warning light goes off.
NO Check for DTCs. If a DTC is output, perform trou-
bleshooting for the DTC. If a normal code is out-
put, replace airbag sensor assembly.
YES
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.
2002 4RUNNER (RM887U)
Author : Date : 634
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