1996 TOYOTA LAND CRUISER batte

R14285 AB0119H00021
Airbag Sensor Assembly
ON
IG2
ACC
(+)
(−)
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−265
1996 LAND CRUISER (RM451U)
DTC 31 Airbag Sensor Assembly Malfunction
CIRCUIT DESCRIPTION
The airbag sensor assembly consists of a airbag sensor, safing sensor, drive circuit, diagnosis circuit and
ignition control, etc.
It receives signals from the airbag sensors, judges whether or not the SRS must be activated, and diagnosis
system malfunction.
DTC 31 is recorded when occurrence of a malfunction in the airbag sensor\
assembly is detected.
DTC No.DTC Detection ConditionTrouble Area
31 Airbag sensor assembly malfunctionAirbag sensor assembly
INSPECTION PROCEDURE
HINT:
When a malfunction code other than code 31 is displayed at the same time, fi\
rst repair the malfunction indi-
cated by the malfunction code other than code 31.
1 Preparation (See step 1 on page DI−271).
2 Check voltage at IG2 and ACC of airbag sensor assembly.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminals IG2 and ACC of airbag
sensor assembly and body ground.
OK:
Voltage: Below 16 V
NG Check battery and charging system (See page CH−2).
OK
DI5QA−03
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AB0069
AB0118
R13006W01934
AB0119
W02045
H00024
P+
P−
Airbag Sensor
Assembly
P Squib
D Squib Spiral
Cable
ACC ON
or
DLC1
E1 Tc Code 54
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−269
1996 LAND CRUISER (RM451U)
3 Check airbag sensor assembly.
PREPARATION:
(a) Connect connector to airbag sensor assembly.
(b) Using service wire, connect P
+ and P− on airbag sensor
assembly side of connector between airbag sensor as-
sembly and front passenger airbag assembly.
(c) Connect negative ( −) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a) Turn ignition switch to ACC or ON, and wait at least 20 se-
conds.
(b) Clear malfunction code stored in memory. (See page DI−240 )
(c) Turn ignition switch to LOCK, and wait at least 20 se-
conds.
(d) Turn ignition switch to ACC or ON, and wait at least 20 se-
conds.
(e) Using SST, connect terminals Tc and E1 of DLC1.
SST 09843−18020
(f) Check DTC.
OK:
DTC 54 is not output.
HINT:
Codes other than code 54 may be output at this time, but they
are not relevant to this check.
NG Replace airbag sensor assembly.
OK
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R05909
AB0118
R13006AB0119
W02045
H00025
Airbag
Sensor
Assembly
P Squib
D Squib Spiral
Cable
ACC ON
or
DLC1
E1 Tc Code 54
DI−270
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
4 Check P squib.
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect negative ( −) terminal cable from the battery,
and wait at least 90 seconds.
(c) Connect front passenger airbag assembly connector.
(d) Connect negative ( −) terminal cable to battery, and wait
at least 2 seconds.
CHECK:
(a) Turn ignition switch to ACC or ON and wait at least 20 se-
conds.
(b) Clear malfunction code stored in memory. (See page DI−240 )
(c) Turn ignition switch to LOCK, and wait at least 20 se-
conds.
(d) Turn ignition switch to ACC or ON, and wait at least 20 se-
conds.
(e) Using SST, connect terminals Tc and E1 of DLC1.
SST 09843−18020
(f) Check DTC.
OK:
DTC 54 is not output.
HINT:
Codes other than code 54 may be output at this time, but they
are not relevant to this check.
NG Replace front passenger airbag assembly.
OK
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.
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R13678
Airbag Sensor
Assembly
Battery F/B
R/B No.2
2
2
1
1
36 4
6 10
9
S4
GR
B
W
L−R
B−L
B−R ACC
IG2
A
IGN
AM1
AM2
FL BLOCK
W−R
B−L
W−R
Ignition
Switch
B
EA2
EA2
4
11 3
CIG
J3 Junction
Connector
GR 4
33
S5 S5
S4
A
2 2
50A AM1
2
2
Short ConnectorGR
B−W
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−271
1996 LAND CRUISER (RM451U)
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 to other circuits −when the SRS warning
light remains lit up and the DTC is a normal code, source voltage drop is ind\
icated.
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.DTC Detection ConditionTrouble Area
NormalSource voltage dorp Battery
 Airbag sensor assembly
WIRING DIAGRAM
DI5QC−03
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R05894 AB0117H00001
Airbag Sensor
Assembly
LOCK
Spiral
Cable
D Squib P Squib
R14285 AB0119H00021
ON
Airbag Sensor Assembly
ACC IG2
(+)
(−)
DI−272
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Preparation.
PREPARATION:
(a) Disconnect negative ( −) terminal cable from the battery,
and wait at least 90 seconds.
(b) Remove steering wheel pad (See page SR−11).
(c) Disconnect connector of front passenger airbag assem- bly (See page RS−22 ).
(d) Disconnect connector of airbag sensor assembly (See page RS−33 ).
CAUTION:
Store the steering wheel pad with the front surface facing
upward.
2 Check source voltage.
PREPARATION:
(a) Connect negative ( −) terminal cable to battery.
(b) Turn ignition switch ON.
CHECK:
Measure voltage at IG2 or ACC on sensor and operate electric
system. (defogger, wiper, headlight, heater blower, etc.)
OK:
Voltage: 10 − 14 V
NG Check the harness between battery and airbag sensor assembly, and check the battery and
charging system.
OK
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R13679
BatteryFL BLOCK 2
MAIN
W
W
ECU−B
1
F/B
S7
B−R
2
3
SRS Warning
Light
8LA
Tc
B−Y8
IH1 Airbag Sensor
Assembly
DLC1
5 W−L
11
GENERATOR
(ALTERNATOR)
W
Cruise Control ECU
W−L
W−L
B−Y
B−Y
IH1 S7 S6
S6
Short Connector
Short Connector W−L
B−L
11
12
3
EA3 11
22
7
DI−274
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
SRS Warning Light System Malfunction (Always lit up, when igni-
tion switch is in LOCK position.)
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the \
ignition switch is
turned from LOCK position to ACC or 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 terminals Tc and E1 of the DLC1 are connected, the DTC is displayed by the blinking\
of the SRS warn-
ing light.
WIRING DIAGRAM
DI5QD−03
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H00094
Airbag Sensor
Assembly
Spiral
Cable
P squib
D squib LOCK
AB0117
N12639
H00026
Airbag Sensor Assembly
LOCK
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−275
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Preparation.
PREPARATION:
(a) Disconnect negative ( −) terminal cable from the battery,
and wait at least 90 seconds.
(b) Remove steering wheel pad. (See SR section)
(c) Disconnect connector of front passenger airbag assem- bly. (See page RS−22 )
CAUTION:
Store the steering wheel pad with the front surface facing
upward.
2 Does SRS warning light turn off?
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect negative ( −) terminal cable from the battery,
and wait at least 90 seconds.
(c) Disconnect airbag sensor assembly connector.
(d) Connect negative (−) terminal cable to battery.
CHECK:
Check operation of SRS warning light.
NO Check SRS warning light circuit or terminal AB circuit of DLC1.
YES
Replace airbag sensor assembly.
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AB0119
R14302H00027
Airbag Sensor Assembly
ON
LA
(−)(+)
H00051
Airbag Sensor
Assembly
P Squib
D Squib Spiral
Cable
ON
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−277
1996 LAND CRUISER (RM451U)
3 Check SRS warning light circuit.
PREPARATION:
(a) Connect negative ( −) terminal cable to battery.
(b) Turn ignition switch to ACC or ON.
CHECK:
Measure voltage LA terminal of harness side connector of air-
bag sensor assembly.
OK:
Voltage: 10 − 14 V
NG Check SRS warning light bulb/repair SRS warn-
ing light circuit.
OK
4 Does SRS warning light come on?
PREPARATION:
(a) Disconnect negative ( −) terminal cable from the battery.
(b) Connect airbag sensor assembly connector.
(c) Connect negative ( −) terminal cable to battery, and wait
at least 2 seconds.
(d) Turn ignition switch to ACC or ON.
CHECK:
Check operation of SRS warning light.
NO Check terminal LA of airbag sensor assembly. If normal, 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.
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Version 1.11 - 03/16/2010