2001 TOYOTA PRIUS Service Repair Manual

H01000H02145H02200
D SquibSpiral
Cable
Airbag
Sensor
Assembly
D+
u"
(±) (+)
R14301H01004H06304
D SquibSpiral
Cable
(±) (+)
Airbag
Sensor
Assembly
D+
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±527
2001 PRIUS (RM778U)
5 Check spiral cable.
PREPARATION:
Disconnect the connector between the airbag sensor assembly
and the spiral cable.
CHECK:
For the connector (on the spiral cable side) between the steer-
ing wheel pad and the spiral cable, measure the resistance be-
tween D+ and body ground.
OK:
Resistance: 1 MW or Higher
NG Repair or replace spiral cable.
OK
6 Check harness between airbag sensor assembly and spiral cable.
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and the airbag sensor assembly, measure the resistance
between D+ and body ground.
OK:
Resistance: 1 MW or Higher
NG Repair or replace harness between airbag sen-
sor assembly and spiral cable.
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.

H01001H02146
AB0119
H11570
D SquibSpiral
Cable
Airbag
Sensor
Assembly
D+
(±) (+)
ON
DI±528
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
2001 PRIUS (RM778U)
DTC B0103/12 Short in D Squib Circuit (to B+)
CIRCUIT DESCRIPTION
The D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad.
It causes the SRS to deploy when the SRS deployment conditions are satisfied.
For details of the function of each component, see OPERATION on page RS±2.
DTC B0103/12 is recorded when a B+ short is detected in the D squib circuit.
DTC No.DTC Detecting ConditionTrouble Area
B0103/12

Short circuit in D squib wire harness (to B+)

D squib malfunction

Spiral cable malfunction

Airbag sensor assembly malfunction
Steering wheel pad (D squib)

Spiral cable

Airbag sensor assembly

Wire harness
WIRING DIAGRAM
See page DI±510.
INSPECTION PROCEDURE
1 Prepare for inspection (See step 1 on page DI±629).
2 Check D squib circuit.
CHECK:
(a) Turn ignition switch to ON.
(b) For the connector (on the spiral cable side) between the
spiral cable and the steering wheel pad, measure the volt-
age between D+ and body ground.
OK:
Voltage: 0 V
NG Go to step 5.
OK
DI6P6±04

H01002AB0119W02043H02144
H10600H10608
D Squib
Spiral
CableAirbag
Sensor
Assembly
D+D±ON
DTC B0103/12
DLC3
" u
Tc CG
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±529
2001 PRIUS (RM778U)
3 Check airbag sensor assembly.
PREPARATION:
(a) Connect the connector to the airbag sensor assembly.
(b) Using a service wire, connect D+ and D± of the connector
(on the spiral cable side) between the spiral cable and the
steering wheel pad.
(c) 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 step 5 on 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 B0103/12 is not output.
HINT:
Codes other than code B0103/12 may be output at this time, but
they are not relevant to this check.
NG Replace airbag sensor assembly.
OK

AB0019W02043
H01003
H10600
H10609
"u
Spiral
Cable
ON
DTC B0103/12
DLC3Airbag
Sensor
Assembly
D Squib
Tc CG
DI±530
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
2001 PRIUS (RM778U)
4 Check D squib.
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 steering wheel pad 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 step 5 on 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 B0103/12 is not output.
HINT:
Codes other than code B0103/12 may be output at this time, but
they are not relevant to this check.
NG Replace steering wheel pad.
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.