TOYOTA PRIUS 2001 Service Repair Manual

H03363
H03355AB0119H03445
Airbag
Sensor
Assembly
Front Airbag
Sensor (RH)
(+)+SR
(±)
±SR Airbag Sensor
Assembly
ON
H03361H03353H03443
Airbag
Sensor
Assembly
Front Airbag
Sensor (RH)
(+)+SR
(±)
±SR Airbag Sensor
Assembly
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±619
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Prepare for inspection (See step 1 on page DI±629).
2 Check wire harness (to B+).
CHECK:
(a) Turn the ignition switch to ON.
(b) For the connector (on the airbag sensor assembly side)
between the front airbag sensor (RH) and the airbag sen-
sor assembly, measure the voltage between body ground
and each of +SR and ±SR.
OK:
Voltage: Below 1 V
NG Go to step 8.
OK
3 Check wire harness (to ground).
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the front airbag sensor (RH) and the airbag sensor as-
sembly, measure the resistance between body ground and
each of +SR and ±SR.
OK:
Resistance: 1 MW or Higher
NG Go to step 9.
OK

H03355H03356H09518
Airbag
Sensor
Assembly Front Airbag
Sensor (RH)
(+)+SR
(±)
±SR Airbag Sensor
Assembly
H03353H03356H03360H16296
Front Airbag
Sensor (RH)
Airbag
Sensor
Assembly
(+)+SR Airbag Sensor
Assembly
(±)
±SR +SR ±SR
DI±620
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
2001 PRIUS (RM778U)
4 Check wire harness.
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the front airbag sensor (RH) and the airbag sensor as-
sembly, measure the resistance between +SR and ±SR.
OK:
Resistance: 1 MW or Higher
NG Go to step 10.
OK
5 Check wire harness.
PREPARATION:
Using a service wire, connect +SR and ±SR of the connector
(on the front airbag sensor (RH) side) between the airbag sen-
sor assembly and the front airbag sensor (RH).
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the front airbag sensor (RH) and the airbag sensor as-
sembly, measure the resistance between +SR and ±SR.
OK:
Resistance: Below 1 W
NG Go to step 11.
OK

H04504H01062H08346
Airbag
Sensor
Assembly Front Airbag
Sensor (RH)
(+) +SR
(±)±SR
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±621
2001 PRIUS (RM778U)
6 Check front airbag sensor (RH).
CHECK:
For the connector of the front airbag sensor (RH), measure the
resistance between +SR and ±SR.
OK:
Resistance: 300 ± 1500 W
NG Replace front airbag sensor (RH).
OK

H02757AB0119H01063H10600H10638
Front Airbag
Sensor (RH)
Airbag
Sensor
Assembly
ON
DTC B1156/B1157/15"u "u
DLC3
Tc CG
DI±622
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
2001 PRIUS (RM778U)
7 Check airbag sensor assembly.
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Disconnect negative (±) terminal cable from the battery,
and wait at least for 90 seconds.
(c) Connect the front airbag sensor (RH) connector and air-
bag sensor assembly connector.
(d) Connect negative (±) terminal cable to the battery, and
wait at least for 2 seconds.
CHECK:
(a) Turn the ignition switch to ON, and wait at least for 20 se-
conds.
(b) Clear the DTC stored in memory (See page DI±497).
(c) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(d) Turn the ignition switch to ON, and wait at least for 20 se-
conds.
(e) Check the DTC (See page DI±497).
OK:
DTC B1156/B1157/15 is not output.
HINT:
Codes other than code 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.

AB0119H03354
H03364H08348
Airbag
Sensor
Assembly Front Airbag
Sensor (RH)
(+)
+SR
(±)
±SR
ON
Engine Room No. 2
Wire Harness
u"
H03354H03362H08349
Airbag
Sensor
Assembly Front Airbag
Sensor (RH)
(+)+SR
(±)±SR Engine Room No. 2
Wire Harness
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±623
2001 PRIUS (RM778U)
8 Check engine room No. 2 wire harness (to B+).
PREPARATION:
Disconnect the engine room No. 2 wire harness connector on
the airbag sensor assembly side.
CHECK:
(a) Turn the ignition switch to ON.
(b) For the connector (on the RH front door wire harness
side) between the airbag sensor assembly and the en-
gine room No. 2 wire harness, measure the voltage be-
tween body ground and each of +SR and ±SR.
OK:
Voltage: Below 1 V
NG Repair or replace engine room No. 2 wire har-
ness.
OK
Repair or replace harness or connector between airbag sensor assembly and engine room No.
2 wire harness.
9 Check engine room No. 2 wire harness (to ground).
PREPARATION:
Disconnect the engine room No. 2 wire harness connector on
the airbag sensor assembly side.
CHECK:
For the connector (on the engine room No. 2 wire harness side)
between the airbag sensor assembly and the engine room No.
2 wire harness, measure the resistance between body ground
and each of +SR and ±SR.
OK:
Resistance: 1 MW or Higher
NG Repair or replace engine room No. 2 wire har-
ness.
OK
Repair or replace harness or connector between airbag sensor assembly and engine room No.
2 wire harness.

H03354H09507H08351
Airbag
Sensor
Assembly
Front Airbag
Sensor (RH)
(±) +SR
±SR
Engine Room No. 2
Wire Harness
(+)
u "
DI±624
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
2001 PRIUS (RM778U)
10 Check engine room No. 2 wire harness.
PREPARATION:
Disconnect the engine room No. 2 wire harness connector on
the airbag sensor assembly side.
CHECK:
For the connector (on the engine room No. 2 wire harness side)
between the airbag sensor assembly and the engine room No.
2 wire harness, measure the resistance between +SR and ±SR.
OK:
Resistance: 1 MW or Higher
NG Repair or replace engine room No. 2 wire har-
ness.
OK
Repair or replace harness or connector between airbag sensor assembly and engine room No.
2 wire harness.

H03352H09507H03360H08350
Airbag
Sensor
Assembly Front Airbag
Sensor (RH)
(+) +SR
(±)±SR
Engine Room No. 2
Wire Harness
+SR
±SR
u "
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±625
2001 PRIUS (RM778U)
11 Check engine room No. 2 wire harness.
PREPARATION:
(a) Disconnect the engine room No. 2 wire harness connec-
tor on the airbag sensor assembly side.
(b) Using a service wire, connect +SR and ±SR of the con-
nector (on the engine room No. 2 wire harness side) be-
tween the engine room No. 2 wire harness and the front
airbag sensor (RH).
CHECK:
For the connector (on the engine room No. 2 wire harness side)
between the airbag sensor assembly and the engine room No.
2 wire harness, measure the resistance between +SR and ±SR.
OK:
Resistance: Below 1 W
NG Repair or replace engine room No. 2 wire har-
ness.
OK
Repair or replace harness or connector between airbag sensor assembly and engine room No.
2 wire harness.

H16901
Airbag Sensor Assembly Front Airbag Sensor (LH)
+SL
±SL A1815
26 2
1 +SLIL1
±SL IL121
A18 W±R
BR
BR W±R DI±626
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
2001 PRIUS (RM778U)
DTC B1158/B1159/16 Front Airbag Sensor (LH) Malfunction
CIRCUIT DESCRIPTION
The front airbag sensor (LH) circuit consists of the airbag sensor assembly and front airbag sensor (LH).
For details of the function of each component, see OPERATION on page RS±2.
DTC B1158/B1159/16 is recorded when malfunction is detected in the front airbag sensor (LH) circuit.
DTC No.DTC Detecting ConditionTrouble Area
B1158/B1159/16
Front airbag sensor (LH) malfunction

Front airbag sensor (LH)

Airbag sensor assembly

Wire harness

Engine room main wire harness
WIRING DIAGRAM
DI6PX±06

AB0119H08065
H03355
H10972
Airbag
Sensor
Assembly
Front Airbag
Sensor (LH)
(+)+SL
(±)
±SL Airbag Sensor
Assembly
ON
H08399H03355H10973
Airbag
Sensor
Assembly
Front Airbag
Sensor (LH)
(+)+SL
(±)
±SL Airbag Sensor
Assembly
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±627
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Prepare for inspection (See step 1 on page DI±629).
2 Check wire harness (to B+).
CHECK:
(a) Turn the ignition switch to ON.
(b) For the connector (on the airbag sensor assembly side)
between the front airbag sensor (LH) and the airbag sen-
sor assembly, measure the voltage between body ground
and each of +SL and ±SL.
OK:
Voltage: Below 1 V
NG Go to step 8.
OK
3 Check wire harness (to ground).
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the front airbag sensor (LH) and the airbag sensor as-
sembly, measure the resistance between body ground and
each of +SL and ±SL.
OK:
Resistance: 1 MW or Higher
NG Go to step 9.
OK

H08058H03355H10974
Airbag
Sensor
Assembly Front Airbag
Sensor (LH)
(+)+SL
(±)
±SL Airbag Sensor
Assembly
H03353H03356H03360H16296
Front Airbag
Sensor (LH)
Airbag
Sensor
Assembly
(+)+SL Airbag Sensor
Assembly
(±)
±SL +SL
±SL
DI±628
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
2001 PRIUS (RM778U)
4 Check wire harness.
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the front airbag sensor (LH) and the airbag sensor as-
sembly, measure the resistance between +SL and ±SL.
OK:
Resistance: 1 MW or Higher
NG Go to step 10.
OK
5 Check wire harness.
PREPARATION:
Using a service wire, connect +SL and ±SL of the connector (on
the front airbag sensor (LH) side) between the airbag sensor
assembly and the front airbag sensor (LH).
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the front airbag sensor (LH) and the airbag sensor as-
sembly, measure the resistance between +SL and ±SL.
OK:
Resistance: Below 1 W
NG Go to step 11.
OK