2001 TOYOTA AVALON Service Repair Manual

DI-492- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)
648 Author
: Date
:
2001 AVALON (RM808U) RCL+ e GND
RWWBSeat moved forward using reclining SW10 - 14 VRCL+ e GND
(P20-2 eP20-7)R-W e W-BOthersBelow 1 V
SLD- e GNDLBWBSeat moved to rear using slide SW10 - 14 VSLD e GND
(P20-3 eP20-7)L-B e W-BOthersBelow 1 V
SLD+ e GNDLWBSeat moved forward using slide SW10 - 14 VSLD+ e GND
(P20-4 eP20-7)L e W-BOthersBelow 1 V
LFT- e GND RWBSeat lowered using rear vertical SW10 - 14 VLFT e GND
(P20-5 eP20-7)R e W-BOthersBelow 1 V
LFT+ e GND LYWBSeat raised using rear vertical SW10 - 14 VLFT+ e GND
(P20-6 eP20-7)L-Y e W-BOthersBelow 1 V
GND e Body Ground
(P20-7 eBody Ground)W-BAIwaysBelow 1 V
+B e Body Ground
(P20-8 eBody Ground)L-OAlways10 - 14 V
FRV- e GND LWWBSeat lowered using front vertical SW10 - 14 VFRV e GND
(P20-9 eP20-7)L-W e W-BOthersBelow 1 V
FRV+ e GND LRWBSeat raised using front vertical SW10 - 14 VFRV+ e GND
(P20-10 eP20-7)L-R e W-BOthersBelow 1 V
MMRY e SWEGYWBSet switch position is OFF.10 - 14 VMMRY e SWE
(P21-9 e P21-7)G-Y e W-BSet switch position is ON.Below 1 V
SW1 e SWEGWWBMemory Switch 1 position is OFF.10 - 14 VSW1 e SWE
(P21-21 e P21-7)G-W e W-BMemory Switch 1 position is ON.Below 1 V
SW2 e SWEYWBMemory Switch 2 position is OFF.10 - 14 VSW2 e SWE
(P21-20 e P21-7)Y e W-BMemory Switch 2 position is ON.Below 1 V

DI4CK-03
H01451
Y-B
D+ C6 14Airbag Sensor Assembly
13
C6D- Y 1
2
Spiral
Cable D Squib DI-362
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
518 Author
: Date
:
2001 AVALON (RM808U)
CIRCUIT INSPECTION
DTC B0100/13 Short in D Squib Circuit
CIRCUIT DESCRIPTION
The D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad.
It causes the airbag to deploy when the airbag deployment conditions are satisfied.
For details of the function of each component, see OPERATION on page RS-3.
DTC B0100/13 is recorded when a short is detected in the D squib circuit.
DTC No.DTC Detecting ConditionTrouble Area
B0100/13

Short circuit between D+ wire harness and D- wire har-
ness of squib

D squib malfunction

Spiral cable malfunction

Airbag sensor assembly malfunction
Steering wheel pad (D squib)

Spiral cable

Airbag sensor assembly

Wire harness
WIRING DIAGRAM

H01001H02142H02193
D SquibSpiral
Cable
Airbag
Sensor
Assembly
D+
(-)(+) D-
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-363
519 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Prepare for inspection (See step 1 on page DI-475).
2 Check D squib circuit.
PREPARATION:
Release the airbag activation prevention mechanism of the
connector (on the airbag sensor assembly side) between the
airbag sensor assembly and the spiral cable (See page
DI-349).
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and the steering wheel pad, measure the resistance be-
tween D+ and D-.
OK:
Resistance: 1 MW or Higher
NG Go to step 5.
OK

FI1390AB0118
R13006AB0119H01002H07478
D SquibSpiral
Cable
Airbag
Sensor
Assembly
E1TcON
or
DTC B0100/13
DLC1"u
ACC
DI-364
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
520 Author
: Date
:
2001 AVALON (RM808U)
3 Check airbag sensor assembly.
PREPARATION:
(a) Connect the connector to the airbag sensor assembly.
(b) 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 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 B0100/13 is not output.
HINT:
Codes other than code B0100/13 may be output at this time, but
they are not relevant to this check.
NG Replace airbag sensor assembly.
OK

AB0118
R13006AB0119FI1390
H01003H01136
D SquibSpiral
CableAirbag
Sensor
Assembly
E1 TcACC ON
or
DTC B0100/13
" u
DLC1
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-365
521 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 LOCK, and wait at least for 20
seconds.
(b) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
(c) Clear the DTC stored in memory (See page DI-349).
(d) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(e) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
(f) Check the DTC (See page DI-349).
OK:
DTC B0100/13 is not output.
HINT:
Codes other than code B0100/13 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.

H01000H02142H02195
D SquibSpiral
Cable
Airbag
Sensor
Assembly
D+ u"
(-) (+) D-
R14286H01004H01138
D SquibSpiral
Cable
Airbag
Sensor
Assembly
D+
(-)(+)D-
DI-366
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
522 Author
: Date
:
2001 AVALON (RM808U)
5 Check spiral cable.
PREPARATION:
(a) Disconnect the connector between the airbag sensor as-
sembly and the spiral cable.
(b) Release the airbag activation prevention mechanism of
the spiral cable connector on the airbag sensor assembly
side (See page DI-349).
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and the steering wheel pad, measure the resistance be-
tween D+ and D-.
OK:
Resistance: 1 MW or Higher
NG Repair or replace spiral cable.
OK
6 Check harness between airbag sensor assembly and spiral cable.
PREPARATION:
Release the airbag activation prevention mechanism of the
connector (on the airbag sensor assembly side) between the
airbag sensor assembly and the spiral cable (See page
DI-349).
CHECK:
For the connector (on the spiral cable side) between the airbag
sensor assembly and the spiral cable, measure the resistance
between D+ and D-.
OK:
Resistance: 1 MW or Higher
NG Repair or replace harness or connector be-
tween airbag sensor 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.

R14286H01001H01139
D SquibSpiral
Cable
Airbag
Sensor
Assembly
D+ u"
(-) (+)D-
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-367
523 Author
: Date
:
2001 AVALON (RM808U)
DTC B0101/14 Open in D Squib Circuit
CIRCUIT DESCRIPTION
The D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad.
It causes the airbag to deploy when the airbag deployment conditions are satisfied.
For details of the function of each components, see OPERATION on page RS-3.
DTC B0101/14 is recorded when an open is detected in the D squib circuit.
DTC No.DTC Detecting ConditionTrouble Area
B0101/14

Open circuit in D+ wire harness or D- wire harness of
squib

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-362.
INSPECTION PROCEDURE
1 Prepare for inspection. (See step 1 on page DI-475)
2 Check D squib circuit.
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and the steering wheel pad, measure the resistance be-
tween D+ and D-.
OK:
Resistance: Below 1 W
NG Go to step 5.
OK
DI4CL-02

AB0118
R13006AB0069
AB0119W02044
H01002
H01140
D SquibSpiral
CableAirbag
Sensor
Assembly
E1TcACCON
or
DTC B0101/14 DLC1"u
D+D-
DI-368
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
524 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 ignition switch to ACC or ON, and wait at least for 20
seconds.
(b) Clear DTC stored in memory (See page DI-349).
(c) Turn ignition switch to LOCK, and wait at least for 20 se-
conds.
(d) Turn ignition switch to ACC or ON, and wait at least for 20
seconds.
(e) Check DTC (See page DI-349).
OK:
DTC B0101/14 is not output.
HINT:
Codes other than code B0101/14 may be output at this time, but
they are not relevant to this check.
NG Replace airbag sensor assembly.
OK