1996 TOYOTA LAND CRUISER restraint

N14677
Fuse
DI−276
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
SRS Warning Light System Malfunction (Does not light up, when
ignition switch is turned to ACC or ON.)
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
Refer to page DI−274 for the WIRING DIAGRAM.
INSPECTION PROCEDURE
1 Check ECU−B Fuse.
PREPARATION:
Remove ECU−B fuse.
CHECK:
Check continuity of ECU −B 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 Preparation. (See step 1 on page DI−271)
DI5QE−03
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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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DI−278
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
5 Is new ECU−B fuse burnt out again?
NO Using simulation method, reproduce malfunc-
tion symptoms (See page IN−18 ).
YES
Check harness between ECU −B fuse and
SRS warning light.
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R13680
Airbag Sensor
AssemblyTc7
B−L
IH1B−Y
11
3
Tc E 1
DLC1 BR−B
EC
S6
S7 11
B−Y
Short Connector 2
2
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−279
1996 LAND CRUISER (RM451U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
By connecting terminals Tc and E1 of the DLC1 the airbag sensor assembly is set in the DTC output mode.
The DTCs are displayed by the blinking of the SRS warning light.
WIRING DIAGRAM
DI5QF−03
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AB0117 AB0118 AB0119H00258
LOCKACCON
or
AB0118
R14305 AB0119
H00030
ACCON
or E1Tc
(+)
(−)
DLC1
DI−280
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
If the DTC is not displayed, perform the following troubleshooting.
1 Does SRS warning light light up for approx. 6 seconds?
PREPARATION:
Check operation of SRS warning light after ignition switch is
turned from LOCK position to ACC or ON position.
NO Check SRS warning light system. (See page DI−240 )
YES
2 Check voltage between terminals Tc and E1 of DLC1.
PREPARATION:
Turn ignition switch to ACC or ON.
CHECK:
Measure voltage between terminals Tc and E1 of DLC1.
OK:
Voltage: 10 − 14 V
OK Go to step 4.
NG
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AB0118
R14304AB0119
H00031
ACCON
or Tc
(+)
(−)
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−281
1996 LAND CRUISER (RM451U)
3 Check voltage between terminals Tc of DLC1 and body ground
CHECK:
Measure voltage between terminals Tc of DLC1 and body
ground.
OK:
Voltage: 10 − 14 V
OK Check harness between terminal E1 of DLC1 and body ground.
NG
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AB0117 AB0118 AB0119
R12658H00032
LOCKACCON
or
Airbag Sensor Assembly
Tc
DI−282
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
4 Check airbag sensor assembly.
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) Insert service wire into terminal Tc from back side as shown.
(e) Connect airbag sensor assembly connector with service wire.
(f) Connect negative (−) terminal cable to battery.
(g) Turn ignition switch to ACC or ON, and wait at least 20 se-
conds.
(h) Connect service wire of terminal Tc to body ground.
CHECK:
Check operation of SRS warning light.
OK:
SRS waning light comes on.
NOTICE:
Never make a mistake with the terminal connection posi-
tion as this will cause a malfunction.
OK Check harness between airbag sensor assem- bly and DLC1.
NG
Replace airbag sensor assembly.
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AB0117
R14303H00033
LOCK
Airbag Sensor Assembly
Tc
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−283
1996 LAND CRUISER (RM451U)
If the DTC is displayed without a DTC check procedure, perform the followi\
ng
troubleshooting.
1 Check resistance between terminal Tc of airbag sensor assembly and body
ground.
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.
CHECK:
Check resistance between terminal Tc of airbag sensor assem-
bly connector and body ground.
OK:
Resistance: 1 MΩ or Higher
NG Repair or replace harness or connector.
OK
Replace airbag sensor assembly.
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