1996 TOYOTA LAND CRUISER sensor

AB0119
W01931
R14300
H00010
Airbag Sensor
Assembly
Spiral
Cable
ON
P Squib
D Squib D+
D−
(+)
(−)
DI−254
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
DTC 12 Short in Squib Circuit (to B+)
CIRCUIT DESCRIPTION
The squib circuit consists of the airbag sensor assembly, spiral cable, steering wheel pad and front passen-
ger airbag assembly. It causes the SRS to deploy when the SRS deployment conditions are sat\
isfied.
For details of the function of each component, see page FUNCTION OF COMP\
ONENTS on page RS−2.
DTC 12 is recorded when a B+ short is detected in the squib circuit.
DTC No.DTC Detection ConditionTrouble Area
12
 Short circuit in squib wire harness (to B+)
 Squib malfunction
 Spiral cable malfunction
 Airbag sensor assembly malfunctionSteering wheel pad (D squib)
 Front passenger airbag assembly (P squib)
 Spiral cable
 Airbag sensor assembly
 Wire harness
WIRING DIAGRAM
Refer to page DI−247 for the WIRING DIAGRAM.
INSPECTION PROCEDURE
1 Preparation. (See step 1 on page DI−271)
2 Check D squib circuit.
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and steering wheel pad, measure the voltage between
D
+, D− and body ground.
OK:
Voltage: 0 V
NG Go to step 7.
OK
DI5Q8−03
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R05898 AB0119
R14300H00011
ONP+
P−
(+)
(−)
Airbag Sensor
Assembly
P Squib
D Squib Spiral
Cable
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−255
1996 LAND CRUISER (RM451U)
3 Check P squib circuit.
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween airbag sensor assembly and front passenger airbag as-
sembly, measure the voltage between P
+, P− and body ground.
OK:
Voltage: 0 V
NG Repair or replace harness or connector be- tween the airbag sensor assembly and front
passenger airbag assembly.
OK
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AB0069
AB0069
AB0118
R13006AB0119W01933
W02043 H00012
Airbag Sensor
Assembly
P+
P−
Spiral
Cable
P Squib
D Squib D− D+ ACC ON
or
DLC1 Code 12
E1 Tc
DI−256
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
4 Check airbag sensor assembly.
PREPARATION:
(a) Connect connector to airbag sensor assembly.
(b) Using a service wire, connect D
+ and D− on spiral cable
side of connector between spiral cable and steering
wheel pad.
(c) Using a service wire, connect P
+ and P− on airbag sensor
assembly side of connector between airbag sensor as-
sembly and front passenger airbag assembly.
(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 12 is not output.
HINT:
Codes other than code 12 may be output at this time, but they
are not relevant to this check.
NG Replace airbag sensor assembly.
OK
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R13006 R05896
AB0118 AB0019W02043H00013
Airbag
Sensor
Assembly
P Squib
D Squib Spiral
Cable
ACC ON
or
DLC1 Code 12
E1 Tc
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−257
1996 LAND CRUISER (RM451U)
5 Check D squib.
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect negative ( −) terminal cable from the battery,
and wait at least 90 seconds.
(c) Connect steering wheel pad 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 12 is not output.
HINT:
Codes other than code 12 may be output at this time, but they
are not relevant to this check.
NG Replace steering wheel pad.
OK
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R05897
R13006 AB0118AB0119
W02043 H00014
Airbag
Sensor
Assembly
P Squib
D Squib Spiral
Cable
ACC ON
or
DLC1 Code 12
E1 Tc
DI−258
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
6 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 12 is not output.
HINT:
Codes other than code 12 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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R05899
AB0119
R14288
H00015
Airbag Sensor
Assembly
P Squib
D Squib Spiral
Cable
D+
(+)(−) ON
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−259
1996 LAND CRUISER (RM451U)
7 Check spiral cable.
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect connector between airbag sensor assembly
and spiral cable.
(c) Turn ignition switch ON.
CHECK:
Measure voltage at D+ on spiral cable side of connector be-
tween spiral cable and steering wheel pad and body ground.
OK:
Voltage: 0 V
NG Repair or replace spiral cable.
OK
Repair or replace harness or connector between airbag sensor assembly an\
d spiral cable.
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R15194
Airbag Sensor
Assembly
Spiral
Cable
D Squib
1
2 3 4
W
B D
+
D−
DI−260
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
DTC 14 Open in D Squib Circuit
CIRCUIT DESCRIPTION
The D squib circuit consists of the airbag sensor assembly, spiral cable and the steering wheel pad.
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 14 is recorded when an open is detected in the squib circuit.
DTC No.DTC Detection ConditionTrouble Area
14
 Open circuit in D+ wire harness or D− wire harness of
squib
 D squib malfunction
 Spiral cable malfunction
 Center airbag sensor assembly malfunctionSteering wheel pad (D squib)
 Spiral cable
 Airbag sensor assembly
 Wire harness
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Preparation. (See step 1 on page DI−271)
DI5Q9−03
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W02055
R14286 R12688H00016
Airbag Sensor
Assembly
Spiral
Cable
P Squib
D Squib D+
D−
D−
D+
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−261
1996 LAND CRUISER (RM451U)
2 Check D squib circuit.
PREPARATION:
Using service wire, connect D+ and D− on airbag sensor assem-
bly connector.
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and steering wheel pad, measure the resistance between
D
+ and D−.
OK:
Resistance: Below 1 Ω
NG Go to step 5.
OK
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