Page 1111 of 1897
H01001H02146
AB0119
H11570
D SquibSpiral
Cable
Airbag
Sensor
Assembly
D+
(-) (+)
ON
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-375
531 Author: Date:
2001 AVALON (RM808U)
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-3.
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 malfunctionSteering wheel pad (D squib)
Spiral cable
Airbag sensor assembly
Wire harness
WIRING DIAGRAM
See page DI-362.
INSPECTION PROCEDURE
1 Prepare for inspection (See step 1 on page DI-475).
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
DI4DN-02
Page 1112 of 1897
H01002AB0118AB0119R13006W02043
H02144H02218
D SquibSpiral
Cable
Airbag
Sensor
Assembly
D+
E1 D-
TcACCON
or
DTC B0103/12
" u
DLC1
DI-376
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
532 Author: Date:
2001 AVALON (RM808U)
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 ACC or ON, and wait at least
for 20 seconds.
(b) Clear the DTC stored in memory
(See step 5 on page DI-349).
(c) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(d) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
(e) Check the DTC (See page DI-349).
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
Page 1113 of 1897
R13006 AB0118 AB0019W02043
H01003
H01132
"u
Spiral
Cable
E1 TcACC ON
or
DTC B0103/12
Airbag
Sensor
Assembly
D Squib
DLC1
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-377
533 Author: Date:
2001 AVALON (RM808U)
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 ACC or ON, and wait at least
for 20 seconds.
(b) Clear the DTC stored in memory
(See step 5 on page DI-349).
(c) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(d) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
(e) Check the DTC (See page DI-349).
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.
Page 1114 of 1897
H01000AB0119H02146H02202
D SquibSpiral
Cable
Airbag
Sensor
Assembly
D+ u"
(-) (+)ON
H01004R14288
AB0119
H08261
D SquibSpiral
Cable
(-) (+)D+
Airbag
Sensor
Assembly
ON
DI-378
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
534 Author: Date:
2001 AVALON (RM808U)
5 Check spiral cable.
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Disconnect the connector between the airbag sensor as-
sembly and the spiral cable.
CHECK:
(a) Turn the 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 Repair or replace spiral cable.
OK
6 Check harness between airbag sensor assembly and spiral cable.
CHECK:
(a) Turn the ignition switch to ON.
(b) For the connector (on the spiral cable side) between the
spiral cable and airbag sensor assembly, measure the
voltage between D+ and body ground.
OK:
Voltage: 0 V
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.
Page 1213 of 1897
H01026H06508H06509
LOCK
Airbag Sensor
Assembly
P Squib
D Squib
P/T Squib (LH)
Side Squib
(LH)
P/T Squib (RH)
Side Squib
(RH)
Spiral
Cable
Side Airbag
Sensor (LH)
Side Airbag
Sensor (RH) Front Airbag
Sensor (LH)
Front Airbag
Sensor (RH)
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-477
633 Author: Date:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Prepare for inspection.
PREPARATION:
(a) Disconnect negative (-) terminal cable from the battery,
and wait at least for 90 seconds.
(b) Remove the steering wheel pad (See page SR-12).
(c) Disconnect the connector of the front passenger airbag
assembly (See page RS-28).
(d) Disconnect the connector of the side airbag assembly RH
and LH (See page RS-42 and RS-56).
(e) Disconnect the connector of the seat belt pretensioner
RH and LH (See page BO-128).
(f) Disconnect the connectors of the airbag sensor assembly
(See page RS-63 and RS-68).
(g) Disconnect the connector of the front airbag sensor RH
and LH (See page RS-73).
(h) Disconnect the connector of the side airbag sensor as-
sembly RH and LH (See page RS-78).
CAUTION:
Store the steering wheel pad, front passenger airbag as-
sembly and side airbag assemlby with the front surface
facing upward.
Page 1214 of 1897
AB0119H01298H01299
Airbag Sensor Assembly
ON
ACC
IG2
(+) (-)
H01249
ON
DI-478
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
634 Author: Date:
2001 AVALON (RM808U)
2 Check source voltage.
PREPARATION:
Connect negative (-) terminal cable to the battery.
CHECK:
(a) Turn ignition switch ON.
(b) Measure the voltage between body ground and each of
IG2 and ACC on the sensor and operate electric system
(defogger, wiper, headlight, heater blower, etc.).
OK:
Voltage: 10 - 14 V
NG Check harness between battery and airbag sen-
sor assembly, and check battery and charging
system.
OK
3 Does SRS warning light turn off?
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Connect the steering wheel pad connector.
(c) Connect the front passenger airbag assembly connector.
(d) Connect the side airbag assembly connectors.
(e) Connect the seat belt pretensioner connectors.
(f) Connect the airbag sensor assembly connectors.
(g) Connect the front airbag sensor connectors.
(h) Connect the side airbag sensor assembly connectors.
(i) Turn the ignition switch to ON.
CHECK:
Operate electric system (defogger, wiper, headlight, heater
blower, etc.) and check that SRS warning light goes off.
NO Check for DTCs. If a DTC is output, perform trou-
bleshooting for the DTC. If a normal code is out-
put, 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.
Page 1225 of 1897
DI161-31
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-355
511 Author: Date:
2001 AVALON (RM808U)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the table
below (Proceed to the page given for that circuit.).
DTC No.
(See Page)Detection ItemTrouble AreaSRS
Warning Light
B0100/13
(DI-362)
Short in D squib circuitSteering wheel pad (squib)
Spiral cable
Airbag sensor assembly
Wire harness
ON
B0101/14
(DI-367)
Open in D squib circuitSteering wheel pad (squib)
Spiral cable
Airbag sensor assembly
Wire harness
ON
B0102/11
(DI-371)
Short in D squib circuit (to ground)Steering wheel pad (squib)
Spiral cable
Airbag sensor assembly
Wire harness
ON
B0103/12
(DI-375)
Short in D squib circuit (to B+)Steering wheel pad (squib)
Spiral cable
Airbag sensor assembly
Wire harness
ON
B0105/53
(DI-379)Short in P squib circuitFront passenger airbag assembly (squib)
Airbag sensor assembly
Wire harness
ON
B0106/54
(DI-383)Open in P squib circuitFront passenger airbag assembly (squib)
Airbag sensor assembly
Wire harness
ON
B0107/51
(DI-386)Short in P squib circuit (to ground)Front passenger airbag assembly (squib)
Airbag sensor assembly
Wire harness
ON
B0108/52
(DI-389)Short in P squib circuit (to B+)Front passenger airbag assembly (squib)
Airbag sensor assembly
Wire harness
ON
B0110/43
(DI-392)Short in side squib (RH) circuitSide airbag assembly RH (squib)
Airbag sensor assembly
Wire harness
Blink
B0111/44
(DI-396)Open in side squib (RH) circuitSide airbag assembly RH (squib)
Airbag sensor assembly
Wire harness
Blink
B0112/41
(DI-402)Short in side squib (RH) circuit
(to ground)Side airbag assembly RH (squib)
Airbag sensor assembly
Wire harness
Blink
B0113/42
(DI-402)Short in side squib (RH) circuit
(to B+)Side airbag assembly RH (squib)
Airbag sensor assembly
Wire harness
Blink
B0115/47
(DI-405)Short in side squib (LH) circuitSide airbag assembly LH (squib)
Airbag sensor assembly
Wire harness
Blink
B0116/48
(DI-409)Open in side squib (LH) circuitSide airbag assembly LH (squib)
Airbag sensor assembly
Wire harness
Blink
Page 1229 of 1897
DI1N1-10
H11973
Spiral Cable Accessory Meter
(Warning Light)Front Passenger Airbag Assembly
Side Airbag Assembly (RH)
Side Airbag Sensor
Assembly (RH)
Seat Belt Pretensioner (RH) Side Airbag Sensor
Assembly (LH)
Seat Belt
Pretensioner (LH)
Side Airbag Assembly (LH)Airbag Sensor Assembly Front Airbag Sensor (RH)
Steering Wheel Pad
(with Airbag)Front Airbag
Sensor (LH)
DI-358
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
514 Author: Date:
2001 AVALON (RM808U)
PARTS LOCATION
