1996 TOYOTA LAND CRUISER Workshop Manual

R05899
R14286H00019
P SquibD+
D− Airbag
Sensor
Assembly
Spiral
Cable
D Squib
W01932
R14286 R12688H00020
Airbag
Sensor
Assembly
Spiral
Cable
P Squib
D Squib D−
D+
D+
D−
DI−264
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
5 Check spiral cable.
PREPARATION:
Disconnect connector between airbag sensor assembly and
spiral cable.
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and steering wheel pad, measure the resistance D
+ and
D
−.
OK:
Resistance: Below 1 Ω
NG Repair or replace spiral cable.
OK
6 Check harness between airbag sensor assembly and spiral cable.
PREPARATION:
Using service wire, connect D+ and D− on airbag sensor assem-
bly connector.
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the airbag sensor assembly and spiral cable, measure
the resistance between D
+ and D−.
OK:
Resistance: Below 1 Ω
NG Repair or replace harness or connector be- tween airbag sensor assembly and spiral cable.
OK
From the results of the above inspection, the malfunctioning part can no\
w be considered normal.
To make sure of this, use the simulation method to check.
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

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
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

AB0118
R13006AB0119
FI1394
H00022
ACCON
or
DLC1
E1 Tc Code 31
DI−266
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
3 Is DTC 31 output again?
PREPARATION:
Clear malfunction code.
CHECK:
(a) Turn ignition switch to LOCK, and wait at least 20 se-
conds.
(b) Turn ignition switch to ACC or ON, and wait at least 20 se-
conds.
(c) Repeat operation in step (a) and (b) at least 5 times.
(d) Using SST, connect terminals Tc and E1 of DLC 1. SST 09843−18020
(e) Check the DTC.
NO Using simulation method, reproduce malfunc- tion symptoms (See page IN−18 ).
YES
Replace airbag sensor assembly.
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

R15195
Airbag Sensor
Assembly
1 2 12
B−R
W−R
P
+
P−
P Squib
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−267
1996 LAND CRUISER (RM451U)
DTC 54 Open in P Squib Circuit
CIRCUIT DESCRIPTION
The P squib circuit consists of the airbag sensor assembly and front passen\
ger airbag assembly.
It causes the airbag to deploy when the airbag deployment conditions are\
satisfied.
For details of the function of each component, see FUNCTION OF COMPONENT\
S on page RS−2.
DTC 54 is recorded when an open is detected in the P squib circuit.
DTC No.DTC Detection ConditionTrouble Area
54
 Open circuit in P+ wire harness or P− wire harness of
squib
 Squib malfunction
 Airbag sensor assembly malfunctionFront passenger airbag assembly (P squib)
 Airbag sensor assembly
 Wire harness
WIRING DIAGRAM
DI5QB−03
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

R14287
W01936R12689H00023
Airbag
Sensor
Assembly
Spiral
Cable
P Squib
D Squib P−
P+
P+
P−
DI−268
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Preparation. (See step 1 on page DI−271)
2 Check P squib circuit.
PREPARATION:
Using service wire, connect P+ and P− on airbag sensor assem-
bly connector.
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the airbag sensor assembly and front passenger airbag
assembly measure the resistance between P
+ and P−.
OK:
Resistance: Below 1 Ω
NG Repair or replace harness or connector be- tween airbag sensor assembly and front pas-
senger airbag assembly.
OK
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

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
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

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.
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010

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
Brought to you by BirfMark
Brought to you by BirfMark
Version 1.11 - 03/16/2010