Page 821 of 1897
I13637
B2
2G Engine Room J/B
DOOR No. 2
12
2C 2CW-L
L-RW-G
1
F7
F61FL Block
ALT1
F10
F81W
B-L
1
1
2H 2G
B
B52 1AM1
5
7
IF1
W-L
R-G
3
ACC
AM1 2IG1
W-R
FL MAIN
Battery 41B514
3C 3D
W-G24
B4Body ECU
B
9
1B
1J
1J
1C
1G W-L
L-R
W
R-G1 105 9ECU-B
7
ECU-ACC
3
1 DOOR No. 1BDR2
ACC
BDR1
1IG1 RELAY
42
3ECU-IG No. 2
2
SIG
4
1C
W-B
W-BW-B
W-B BB
IF J4 J/C
11
B4
B5 14GND2
GND1 DCC
1
Engine Room J/B
Engine Room R/B No. 5J/B No. 3
Driver Side J/B
3
Ignition Switch
IG W-L DI-628
- DIAGNOSTICSBODY CONTROL SYSTEM
784 Author: Date:
2001 AVALON (RM808U)
WIRING DIAGRAM
Page 822 of 1897
- DIAGNOSTICSBODY CONTROL SYSTEM
DI-629
785 Author: Date:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check ECU-ACC, DOOR No. 1, DOOR No. 2, ECU-IG No. 2, ECU-B No. 1 and
ECU-B No. 2 fuse.
CHECK:
Check continuity of ECU-ACC, DOOR No. 1, DOOR No. 2, ECU-IG No. 2, ECU-B No. 1 and ECU-B No.
2 fuse.
OK:
Continuity
NG Replace the failure fuse.
OK
2 Check voltage between terminals ACC, B, BDR 1, BDR 2, SIG and GND or GND2
of Body ECU connector.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminals ACC, SIG, BDR 1, and GND, GND2.
OK:
Voltage: 10 - 14V
PREPARATION:
(a) Turn ignition switch OFF.
(b) Disconnect the Body ECU connector.
CHECK:
Measure voltage between terminals B, BDR 2, BSUB and GND, GND2.
OK:
Voltage: 10 - 14V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-622).
NG
Page 836 of 1897
DI6LH-01
I11666
Engine Room Junction Block
Headlight Control Relay
Light Control Switch
Luggage Compartment Door
Opener Switch
DLC3
Ignition Switch
Key Unlock Warning Switch
Instrument Panel Junction Block
Body ECU
DOME Fuse
- DIAGNOSTICSBODY CONTROL SYSTEM
DI-617
773 Author: Date:
2001 AVALON (RM808U)
PARTS LOCATION
Page 838 of 1897
DI6LJ-01
DI-622
- DIAGNOSTICSBODY CONTROL SYSTEM
778 Author: Date:
2001 AVALON (RM808U)
PROBLEM SYMPTOMS TABLE
IGNITION SWITCH AND KEY UNLOCK WARNING SWITCH:
SymptomSuspect AreaSee page
Ignition switch is not set to each position.1. Ignition switch
2. Power source circuitBE-16
DI-627
Key unlock warning system does not operate.
(The buzzer does not sound when the driver's door is opened with
the ignition OFF and key inserted)
1. Power source circuit
2. Key unlock warning switch circuit
3. Door courtesy switch circuit
4. Driver door ECU
5. Multiplex communication circuit
6. Body ECU
7. Wire harnessDI-627
DI-637
DI-639
DI-676
DI-718
IN-30
IN-30
Key unlock warning system does not operate.
(The buzzer sounds when the ignition key is ACC or ON)1. Ignition switch
2. Power source circuit
3. Wire harnessBE-16
DI-627
IN-30
HEADLIGHT AND TAILLIGHT SYSTEM (USA):
SymptomSuspect AreaSee page
Only one side headlight does not light.
1. HEAD-(LH, RH) fuse
2. Headlight bulb
3. Wire harnessBE-9
-
IN-30
Headlight does not light.
1. HEAD-(LH, RH) fuse
2. Headlight control relay circuit
3. Light control switch circuit
4. Headlight bulb
5. Wire harnessBE-9
DI-635
DI-631
-
IN-30
ºLo-Beamº does not light.
1. Headlight bulb
2. Headlight dimmer switch
3. Light control switch circuit
4. Wire harness-
DI-631
DI-631
IN-30
ºHi-Beamº does not light.
1. Headlight bulb
2. Headlight dimmer switch
3. Light control switch circuit
4. Wire harness-
DI-631
DI-631
IN-30
ºFlashº does not light.1. Headlight dimmer switch
2. Wire harnessDI-631
IN-30
Only one side taillight does not light.1. Taillight bulb
2. Wire harness-
IN-30
Taillight does not light.
1. TAIL fuse
2. Taillight control relay circuit
3. Light control switch circuit
4. Body ECU
5. Wire harnessBE-9
DI-633
DI-631
IN-30
IN-30
Rear Combination light does not light.
1. Bulb
2. Light failure sensor
3. Wire harness-
BE-53
IN-30
Page 843 of 1897
DI6LI-01
I11362I11578I11577I13264
B4
B5
- DIAGNOSTICSBODY CONTROL SYSTEM
DI-619
775 Author: Date:
2001 AVALON (RM808U)
TERMINALS OF ECU
Terminal No. (Symbols)Wring ColorConditionSTD Voltage (V)
1 e B5-14
(BDR1 eGND1)- e W-BConstant10 - 14 V
2 e B5-14WBIgnition switch OFF or ACCBelow 1 V2 e B5 14
(SIG eGND1)- e W-BIgnition switch ON10 - 14 V
3 e B5-14WBIgnition switch OFFBelow 1 V3 e B5 14
(ACC e GND1)- e W-BIgnition switch ACC or ON10 - 14 V
5 e B5-14WBEach door are openedBelow 1 V5 e B5 14
(ILL e GND1)- e W-BAll door are closed10 - 14 V
7 e B5-14
(BDR2 e GND1)- e W-BConstant10 - 14 V
8 e B5-14WBIgnition switch ON and light control switch HEADBelow 2 V8 e B5 14
(HEAD e GND1)- e W-BIgnition switch ON and light control switch OFF10 - 14 V
9 e B5-14WBIgnition switch ON and light control switch TAILBelow 2 V9 e B5 14
(TRLY e GND1)- e W-BIgnition switch ON and light control switch OFF10 - 14 V
10 e B5-14WBHorn switch position is ONBelow 1 V10 e B5 14
(HORN e GND1)- e W-BHorn switch position is OFF10 - 14 V
11 e B5-14WBBrake pedal is pushed10 - 14 V11 e B5 14
(STOP e GND1)- e W-BBrake pedal is releasedBelow 1 V
B4-1 e B5-14GWWBPark/neutral position switch is except P position10 - 14 VB4 1 e B5 14
(P e GND1)G-W e W-BPark/neutral position switch is P positionBelow 1 V
B4-2 e B5-14BWWBHeadlight control switch position is FLASHBelow 1 VB4 2 e B5 14
(HF e GND1)B-W e W-BHeadlight control switch position is except FLASH10 - 14 V
B4-3 e B5-14RYWBLight control switch HEADBelow 2 VB4 3 e B5 14
(HEAD e GND1)R-Y e W-BLight control switch OFF or TAIL10 - 14 V
B4-4 e B5-14GOWBLight control switch AUTOBelow 2 VB4 4 e B5 14
(AUTO e GND1)G-O e W-BLight control switch OFF, TAIL or HEAD10 - 14 V
B4-5 e B5-14RLWBDriver door closed10 - 14 VB4 5 e B5 14
(DCTY e GND1)R-L e W-BDriver door openedBelow 1 V
B4-6 e B5-14RWBLuggage compartment door is openedBelow 1 VB4 6 e B5 14
(LGC e GND1)R e W-BLuggage compartment door is closed10 - 14 V
Page 845 of 1897
- DIAGNOSTICSBODY CONTROL SYSTEM
DI-621
777 Author: Date:
2001 AVALON (RM808U) B5-6 e B5-14
RLWBIgnition switch ON10 - 14 VB5 6 e B5 14
(ALTL e GND1)R-L e W-BEngine runningBelow 1 V
B5-7 e B5-14
(CLTE e GND1)Y-B e W-BAutomatic light control sensor communication circuit-
B5-8 e B5-14
(CLTS e GND1)LG e W-BAutomatic light control sensor communication circuit-
B5-9 e B5-14
(MPX3 e GND1)R-Y e W-BMultiplex communication circuit-
B5-10 e B5-14
(RRU e GND1)G-B e W-BRear right side power window UP operationBelow 1 V
B5-1 1 e B5-14GRWBPassenger seat belt unfastenedBelow 1 VB5 1 1 e B5 14
(PBEW e GND1)G-R e W-BPassenger seat belt fastened10 - 14 V
B5-13 e Body ground
(CLTC e Body ground)W-B e Body groundConstantBelow 1 V
B5-14 e Body ground
(GND1 e Body ground)W-B e -ConstantBelow 1 V
B5-16 e B5-14RWWBRear door closed10 - 14 VB5 16 e B5 14
(RCTY e GND1)R-W e W-BRear door openedBelow 1 V
B5-17 e B5-14GWBPassenger seat belt unfastenedBelow 1 VB5 17 e B5 14
(PBKL e GND1)G e W-BPassenger seat belt fastened10 - 14 V
B5-18 e B5-14LBWBLuggage compartment door opener switch is operatedBelow 1 VB5 18 e B5 14
(TKU e GND1)L-B e W-BLuggage compartment door opener switch is not operated10 - 14 V
B5-20 e B5-14
(CLTB e GND1)L e W-BAutomatic light control sensor communication circuit-
B5-21 e B5-14
(MPX4 e GND1)G-B e W-BMultiplex communication circuit-
B5-22 e B5-14
(RRD e GND1)R-B e W-BRear right side power window DOWN operationBelow 1 V
B5-23 e B5-14GWWBPassenger seat belt unfastenedBelow 1 VB5 23 e B5 14
(DBEW e GND1)G-W e W-BPassenger seat belt fastened10 - 14 V
B5-25 e B5-14RWBEach door closed10 - 14 VB5 25 e B5 14
(AJAR- e GND1)R e W-BEach door openedBelow 1 V
Page 847 of 1897
I00004
I00151
2
1
DI-562
- DIAGNOSTICSCRUISE CONTROL SYSTEM
718 Author: Date:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check resistance between terminals MO and MC of actuator motor.
PREPARATION:
(a) Turn ignition switch OFF.
(b) Disconnect the actuator connector.
CHECK:
Measure resistance between terminals 1 and 2.
HINT:
If control plate is in fully opened or fully closed positions, resis-
tance can not be measured.
OK:
Resistance: more than 4.2 W
NG Replace cruise control actuator.
OK
2 Check for open and short in harness and connectors between cruise control
ECU and actuator motor (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page IN-30).
Page 849 of 1897
I14465
STOP Fuse
I00133
21
43
DI-564
- DIAGNOSTICSCRUISE CONTROL SYSTEM
720 Author: Date:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check STOP fuse.
PREPARATION:
(a) Turn ignition switch OFF.
(b) Remove the STOP fuse from instrument panel junction
block.
CHECK:
Check fuse continuity.
OK:
There is continuity.
NG Replace STOP fuse.
OK
2 Check stop light switch.
PREPARATION:
Disconnect the stop light switch connector.
CHECK:
Check continuity between terminals.
Switch positionContinuity
Switch pin free
(Brake pedal depressed)1 - 2
Switch pin pushed in
(Brake pedal released)3 - 4
NG Replace stop light switch.
OK
