Page 1704 of 3115
H21247
Airbag Sensor
Assembly
C26IG2 5
B-R
3F3 IGN
3E4Cowl Side J/B RH
AB-R
AJ4
J/C
B-R
6 7
W-RCowl Side J/B LH
2E
2A 41 10
BatteryF15
FL Block
MAINB-G Engine Room J/B
1C 1B1 9AM2
W-R I18
Ignition SW
2 AM2 IG2
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-923
111 6 Author: Date:
2004 LAND CRUISER (RM1071U)
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 differ from the other circuits in that when the SRS
warning light remains on and the DTC shows a normal code, source voltage drop is indicated.
Malfunction in this circuit is not recorded in the airbag sensor assembly, and when the source voltage returns
to normal, the SRS warning light automatically goes off.
DTC No.Diagnosis
(Normal)Source voltage drop
WIRING DIAGRAM
DI8FC-09
Page 1706 of 3115
AB0119H21169H21525
Airbag Sensor Assembly
ON
IG2
(+) (-)
AB0119H17211H17227
ON
Airbag Sensor Assembly
(-)
(+)E2
E1
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-925
111 8 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check source voltage.
PREPARATION:
Connect the negative (-) terminal cable to the battery.
CHECK:
(a) Turn the ignition switch to ON.
(b) Measure the voltage between the body ground and IG2
on the airbag sensor assembly and operate electric sys-
tem (defogger, wiper, headlight, heater blower, etc.).
OK:
Voltage: 10 - 14 V
NG Check harness between battery and airbag sen-
sor assembly, and check battery and charging
system.
OK
3 Check airbag sensor assembly connector.
CHECK:
Measure the resistance between the body ground and each of
E1 and E2 of the airbag sensor assembly connector.
OK:
Resistance: 0 W (Continuity)
NG Repair or replace airbag sensor assembly con-
nector.
OK
Page 1707 of 3115
H01249
ON
DI-926
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
111 9 Author: Date:
2004 LAND CRUISER (RM1071U)
4 Does SRS warning light turn off?
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Connect the steering wheel pad connector.
(c) Connect the front passenger airbag assembly connector.
(d) w/ Side airbag:
Connect the side airbag assembly connectors.
(e) Connect the seat belt pretensioner connectors.
(f) Connect the airbag sensor assembly connectors.
(g) Connect the front airbag sensor connectors.
(h) w/ Side airbag:
Connect the side and curtain shield airbag sensor assem-
bly connectors.
(i) w/ Side airbag:
Connect the curtain shield airbag assembly connectors.
(j) w/ Side airbag:
Connect the curtain shield airbag sensor assembly con-
nectors.
(k) Connect the seat position sensor assembly connector.
(l) Connect the front seat inner belt LH connector.
CHECK:
(a) Turn the ignition switch to ON.
(b) Operate electric system (defogger, wiper, headlight, heat-
er 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.
Page 1708 of 3115
H21248
BatteryAirbag Sensor
Assembly
B-Y
LA
IG2 AM2
W-R41 Combination Meter
1011
3Q8
2A 2EB-Y
3F
C14Cowl Side J/B RH
MET
B-RC26
63
4
3E 7
3Q 4
C12 A/B
10
MAIN 2A
J4
J/C SB
B-G Cowl Side J/B LH
Engine Room J/B
1
1B1C 9AM23E 11 D7
DLC3
11
F15
FL Block W-R
7B-R
AA SRSSB
I18
Ignition SW
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-927
1120 Author: Date:
2004 LAND CRUISER (RM1071U)
SRS Warning Light Circuit Malfunction
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light comes on for approx. 6 seconds after the ignition switch
is turned from the LOCK position to ON position, and then turns off automatically.
If there is a malfunction in the SRS, the SRS warning light lights up to inform the driver of the abnormality.
When terminal TC and CG of the DLC3 are connected, the DTC is indicated by blinking the SRS warning
light.
WIRING DIAGRAM
DIB45-01
Page 1709 of 3115
AB0117H01293H01295
Airbag Sensor Assembly
LOCK
DI-928
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1121 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
Always lights up, when ignition switch is in LOCK position.
1 Prepare for inspection (See step 1 on page DI-923).
2 Does SRS warning light turn off?
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Disconnect the negative (-) terminal cable from the bat-
tery, and wait at least for 90 seconds.
(c) Disconnect the airbag sensor assembly connector.
(d) Connect the negative (-) terminal cable to the battery.
CHECK:
Check operation of SRS warning light.
NO Check combination mater (See page BE-2).
YES
Replace airbag sensor assembly.
Page 1710 of 3115
N14677
Fuse
AB0119H01300
H01301
Airbag Sensor Assembly
ON
LA
(+)
(-)
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-929
1122 Author: Date:
2004 LAND CRUISER (RM1071U)
Does not light up, when ignition switch is turned to ON.
1 Check AM2 Fuse.
PREPARATION:
Remove the AM2 fuse.
CHECK:
Check continuity of the AM2 fuse.
OK:
Continuity
HINT:
Fuse may be burnt out even if it appears to be OK during
visual inspection.
If fuse is OK, install it.
NG Go to step 5.
OK
2 Prepare for inspection (See step 1 on page DI-923).
3 Check SRS warning light circuit.
PREPARATION:
Connect the negative (-) terminal cable to the battery, and wait
at least for 2 seconds.
CHECK:
(a) Turn the ignition switch to ON.
(b) Measure the voltage between the body ground and LA of
the airbag sensor assembly connector.
OK:
Voltage: 10 - 14 V
NG Check SRS warning light bulb or repair SRS
warning light circuit.
OK
Page 1711 of 3115
AB0119H20916H21236
H21527
Airbag
Sensor
Assembly
Side and Curtain Shield
Airbag Sensor RH (*1)
Side Squib RH (*1)
P Squib
D Squib
Spiral
Cable
Front Airbag
Sensor RH
Front Airbag
Sensor LH
Curtain Shield
Squib LH (*1)
Side and Curtain Shield
Airbag Sensor LH (*1)
Side Squib LH (*1)
Curtain Shield
Squib RH (*1)
Curtain Shield Airbag
Sensor Assembly LH (*1)Curtain Shield Airbag
Sensor Assembly RH (*1)
ON
Seat Position
Sensor Assembly
P/T Squib RH
P/T Squib LH Front Seat Inner Belt
*1: w/ Side Airbag
DI-930
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1123 Author: Date:
2004 LAND CRUISER (RM1071U)
4 Does SRS warning light come on?
PREPARATION:
(a) Disconnect the negative (-) terminal cable from the bat-
tery, and wait at least for 90 seconds.
(b) Connect the airbag sensor assembly connector.
(c) Connect the negative (-) terminal cable to the battery,
and wait at least for 2 seconds.
CHECK:
(a) Turn the ignition switch to ON.
(b) Check operation of the SRS warning light.
NO 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 simulation method to check.
Page 1714 of 3115
AB0117AB0119H20916H21240
ON LOCK
AB0119H10688H10654
ON
CG
TC
(+) (-)
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-933
1126 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
If the DTC is not displayed, do the following troubleshooting.
1 Does SRS warning light light up for approx. 6 seconds?
CHECK:
Check operation of the SRS warning light after ignition switch
is turned from LOCK position to ON position.
NO Check SRS warning light system.
(See page DI-927)
YES
2 Check voltage between terminal TC and CG of DLC3.
PREPARATION:
Turn the ignition switch to ON.
CHECK:
Measure the voltage between terminal TC and CG of DLC3.
OK:
Voltage: 4 - 14 V
OK Go to step 4.
NG
