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DI-471
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
DI8AT-01
DTC B1156/B1157/15 Front Airbag Sensor (RH) Malfunction
CIRCUIT DESCRIPTION
The front airbag sensor (RH) circuit consists of the airbag sensor assembly and front airbag sensor (RH).
For details of the function of each component, see OPERATION on page RS-2 .
DTC B1156/B1157/15 is recorded when malfunction is detected in the front airbag sensor (RH) circuit.
DTC No. DTC Detecting Condition Trouble Area
S Front airbag sensor (RH)
B1156/B1157/15 S Front airbag sensor (RH) malfunction S Airbag sensor assembly
S Wire harness
WIRING DIAGRAM
Front Airbag Sensor (RH) Airbag Sensor Assembly
2 9
B-W B-W
SR+ IK6 C5 SR+
2
1 20
BR-W BR-W
SR- IK6 C5 SR-
1
H02750
2001 SIENNA (RM787U)
Author : Date : 625
DI-472
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
INSPECTION PROCEDURE
1 Prepare for inspection. (See step 1 on page DI-486 )
2 Check front airbag sensor (RH) circuit.
CHECK:
For the connector (on the airbag sensor assembly side) be-
Airbag
tween the front airbag sensor (RH) and the airbag sensor as-
Sensor
Assembly sembly, measure the resistance between SR+ and SR-.
OK:
Front Airbag
Sensor (RH) Resistance: 754 - 886
Airbag Sensor
Assembly
SR+
SR-
H02730
NG Go to step 6.
OK
2001 SIENNA (RM787U)
Author : Date : 626
DI-473
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
3 Check front airbag sensor (RH) circuit (to ground).
CHECK:
For the connector (on the airbag sensor assembly side) be-
Airbag
Sensor tween the front airbag sensor (RH) and the airbag sensor as-
Assembly sembly, measure the resistance between SR+ and body
Front Airbag
ground.
Sensor (RH) OK:
Airbag Sensor
Resistance: 1 M or Higher
Assembly
SR+
H02731
NG Go to step 9.
OK
4 Check front airbag sensor (RH) circuit (to B+).
PREPARATION:
Connect negative (-) terminal cable to the battery, and wait at
Airbag
Sensor
least for 2 seconds.
Assembly CHECK:
Front Airbag For the connector (on the airbag sensor assembly side) be-
Sensor (RH) tween the front airbag sensor (RH) and the airbag sensor as-
Airbag Sensor
sembly, measure the voltage between SR+ and body ground.
Assembly
OK:
Voltage: Below 1 V
SR+
H02732
NG Go to step 11.
OK
2001 SIENNA (RM787U)
Author : Date : 627
DI-474
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
5 Check airbag sensor assembly.
PREPARATION:
(a) Turn ignition switch to LOCK.
Airbag (b) Disconnect negative (-) terminal cable from the battery,
Sensor and wait at least for 90 seconds.
Assembly (c) Connect the front airbag sensor (RH) connector and air-
Front Airbag bag sensor assembly connector.
Sensor (RH) (d) Connect negative (-) terminal cable to the battery, and
wait at least for 2 seconds.
ACC ON
CHECK:
(a) Turn ignition switch to ACC or ON, and wait at least for 20
or seconds.
(b) Clear DTC stored in memory (See page DI-358 ).
DLC1 DTC
(c) Turn ignition switch to LOCK, and wait at least for 20 se-
B1156/B1157/15
conds.
(d) Turn ignition switch to ACC or ON, and wait at least for 20
seconds.
E1 Tc (e) Check DTC (See page DI-358 ).
H02757
AB0118 AB0119 OK:
R13006H01063
H04014 DTC B1156/B1157/15 is not output.
HINT:
Codes other than DTC B1156/B1157/15 may be output at this
time, but they are not relevant to this check.
NG Replace airbag sensor 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. If the malfunctioning part can not be
detected by the simulation method, replace all SRS components including the wire harness.
2001 SIENNA (RM787U)
Author : Date : 628
DI-475
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
6 Check front airbag sensor (RH).
PREPARATION:
Disconnect the front airbag sensor connector (RH).
CHECK:
Airbag For the connector (on the front airbag sensor side), measure
Sensor the resistance between SR+ and SR-.
Assembly OK:
Front Airbag Resistance: 754 - 886
Sensor (RH)
SR-
SR+
H02758
(+) (-)
H01062 H04015
NG Replace front airbag sensor (RH).
OK
7 Check relay harness.
Relay Harness PREPARATION:
Disconnect the relay harness connector on the airbag sensor
assembly side.
Airbag
CHECK:
Sensor
For the connector (on the relay harness side) between the front
Assembly
airbag sensor (RH) and the relay harness, measure the resis-
Front Airbag tance between SR+ and SR-.
Sensor (RH) OK:
SR- SR+ Resistance: 1 M or Higher
H02759
NG Repair or replace relay harness.
OK
2001 SIENNA (RM787U)
Author : Date : 629
DI-476
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
8 Check relay harness.
Relay Harness PREPARATION:
Front Airbag
Using service wire, connect SR+ and SR- of the connector (on
Sensor (RH)
the relay harness side), between the airbag sensor assembly
Airbag
and the relay harness.
Sensor
CHECK:
Assembly
For the connector (on the relay harness side) between the front
airbag sensor (RH) and the relay harness, measure the resis-
tance between SR+ and SR-.
SR- SR+ SR- SR+
OK:
Resistance: Below 1
H02769
NG Repair or replace relay harness.
OK
Repair or replace harness or connector between airbag sensor assembly and relay harness.
9 Check wire harness (to ground).
PREPARATION:
Disconnect the front airbag sensor connector (RH).
Airbag
CHECK:
Sensor
Assembly For the connector (on the airbag sensor assembly side) be-
tween the front airbag sensor (RH) and the airbag sensor as-
Front Airbag
Sensor (RH)
sembly, measure the resistance between body ground and
Airbag Sensor
each of SR+ and SR-.
Assembly
OK:
Resistance: 1 M or Higher
SR+
SR- NG Go to step 9.
H02733
OK
Replace front airbag sensor (RH).
2001 SIENNA (RM787U)
Author : Date : 630
DI-477
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
10 Check relay harness (to ground).
Relay Harness PREPARATION:
Disconnect the relay harness connector on the airbag sensor
assembly side.
Airbag
CHECK:
Sensor
For the connector (on the relay harness side) between the front
Assembly
airbag sensor (RH) and the relay harness, measure the resis-
Front Airbag
tance between body ground and each of SR+ and SR-.
Sensor (RH)
OK:
SR- SR+ Resistance: Below 1 M or Higher
H02770
NG Repair or replace relay harness.
OK
Repair or replace harness or connector between airbag sensor assembly and relay harness.
11 Check wire harness (to B+).
PREPARATION:
Disconnect the front airbag sensor connector (RH).
Airbag
Sensor CHECK:
Assembly For the connector (on the airbag sensor assembly side) be-
Front Airbag tween the front airbag sensor (RH) and the airbag sensor as-
Sensor (RH) sembly, measure the voltage between body ground and each
Airbag Sensor
of SR+ and SR-.
Assembly
OK:
Voltage: Below 1 V
SR+
SR-
H02734
NG Go to step 11.
OK
Replace front airbag sensor (RH).
2001 SIENNA (RM787U)
Author : Date : 631
DI-478
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
12 Check relay harness (to B+).
Relay Harness PREPARATION:
Disconnect the relay harness connector on the airbag sensor
assembly side.
Airbag
CHECK:
Sensor
For the connector (on the relay harness side) between the front
Assembly
airbag sensor (RH) and the relay harness, measure the voltage
Front Airbag
between body ground and each of SR+ and SR-.
Sensor (RH)
OK:
SR- SR+ Voltage: Below 1 V
H02771
NG Repair or replace relay harness.
OK
Repair or replace harness or connector between airbag sensor assembly and relay harness.
2001 SIENNA (RM787U)
Author : Date : 632
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