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BE-2
BODY ELECTRICAL - TROUBLESHOOTING
TROUBLESHOOTING
BE0EV-05
PROBLEM SYMPTOMS TABLE
POWER OUTLET:
Symptom Suspect Area See page
1. Battery -
Electric power source cannot be taken out of the power outlet 2. POWER OUTLET Fuse (I/P J/B No.1) -
3. Wire Harness -
HEADLIGHT AND TAILLIGHT SYSTEM:
Symptom Suspect Area See page
1. Head Relay BE-18
Headlight does not light up 2. DIM Relay BE-18
(Taillight is normal) 3. DRL Relay BE-18
4. Wire Harness -
1. Body ECU (Integration relay) DI-628
Headlight and taillight does not light up 2. Light contorol Switch BE-18
3. Wire Harness -
1. Headlight Bulb -
Only one side headlight does not light up 2. HEAD LO (LH, RH) Fuse (E/G Room R/B No.7) -
3. Wire Harness -
1. Headlight Bulb -
2. HEAD LO (LH, RH) Fuse (E/G Room R/B No.7) -
3. Headlight Control Relay (E/G Room J/B No.2) BE-18
"Lo-Beam" does not light up
4. Body ECU (Integration Relay) DI-628
5. Light Control Switch BE-18
6. Wire Harness -
1. Headlight Bulb -
2. ECU-B Fuse (E/G Room J/B No.2) -
3. HEAD HI (LH, RH) Fuse (E/G Room J/B No.2) -
4. DRL Relay (R/B No.7) BE-18
"Hi-Beam" does not light up
5. DIM Relay (R/B No.7) BE-18
6. Daytime Running Light Relay (Main) BE-18
7. Headlight Dimmer Switch BE-18
8. Wire Harness -
1. Headlight Bulb -
2. ECU-B Fuse (E/G Room J/B No.2) -
3. HEAD HI (LH, RH) Fuse (E/G Room J/B No.2) -
4. DRL Relay (R/B No.7) BE-18
"Flash" does not light up 5. DIM Relay (R/B No.7) BE-18
6. Daytime Running Light Relay No.3 BE-18
(E/G Room R/B No.2)
7. Headlight Dimmer Switch BE-18
8. Wire Harness -
1. GAUGE Fuse (Driver Side J/B No.1) -
2. DOME Fuse (E/G Room J/B No.2) -
3. Body ECU (Integration Relay) DI-628
"Auto Turn-of f System" does not operate.
4. Door Courtesy Switch (Driver's) BE-31
5. Ignition Switch BE-15
6. Wire Harness -
2001 SIENNA (RM787U)
Author : Date : 1520
BE-3
BODY ELECTRICAL - TROUBLESHOOTING
1. Headlight Bulb -
2. ECU-B Fuse (E/G Room J/B No.2) -
3. GAUGE Fuse (Driver Side J/B No.1) -
Headlight does not light up with engine running and light control
4. HEAD HI (LH, RH) Fuse (E/G Room J/B No.2) -
SW in OFF.
5. Daytime Running Light Relay (Main) BE-18
6. Wire Harness -
7. Other Parts* -
1. TAIL Fuse (Driver Side J/B No.1) -
2. Taillight Control Relay (Driver Side J/B No.1) BE-18
Taillight does not light up
3. Body ECU (Integration Relay) BE-15
(Headlight is normal)
4. Light Control Switch BE-18
5. Wire Harness -
1. Bulb -
Only one side light does not light up
2. Wire Harness -
1. Bulb -
Rear combination light does not light up
2. Wire Harness -
*Terminal L of Generator and Parking Brake Switch
FOG LIGHT SYSTEM
Symptom Suspect Area See page
1. FOG Fuse (R/B NO.7) -
2. H-LP LH LO Fuse (R/B NO.7) -
Fog light does not light up with light control SW HEAD 3. Fog Light Relay BE-26
(Headlight is normal.) 4. Head Relay (Engine Room J/B NO.2) BE-18
5. Fog Light Switch BE-26
6. Wire Harness -
Fog light does not light up with light control SW HEAD 1. *1 Other Parts -
(Headlight does not light). 2. Wire Harness -
1. Bulb -
Only one light does not light up.
2. Wire Harness -
*1: Inspect Headlight System
TURN SIGNAL AND HAZARD WARNING SYSTEM:
Symptom Suspect Area See page
1. Hazard Fuse (Engine Room J/B NO.2) -
2. Hazard Warning Switch BE-29
"Hazard" and "Turn" do not light up.
3. Turn Signal Flasher BE-29
4. Wire Harness -
1. Bulb -
2. Turn Signal Flasher BE-29
The flashing frequency is abnormal.
3. Turn Signal Switch BE-29
4. Wire Harness -
1. Hazerd Fuse (E/G Room J/B No.2) -
Hazard warning light does not light up.
2. Hazerd Warning Switch BE-29
(Turn is normal.)
3. Wire Harness -
1. Hazard Warning Switch BE-29
Hazard warning light does not light up in one direction.
2. Wire Harness -
1. Ignition Switch BE-15
2. TURN Fuse (Driver Side J/B No.1) -
*1Turn signal does not light up.
3. Turn Signal Switch BE-29
4. Wire Harness -
1. TURN Fuse (Driver Side J/B No.1) -
*2Turn signal does not light up. 2. Turn Signal Switch BE-29
3. Wire Harness -
2001 SIENNA (RM787U)
Author : Date : 1521
BE-4
BODY ELECTRICAL - TROUBLESHOOTING
1. Turn Signal Switch BE-29
Turn signal does not light up in one direction.
2. Wire Harness -
1. Bulb -
Only one bulb does not light up.
2. Wire Harness -
*1: Combination Meter, Wiper and Washer do not operate.
*2: Combination Meter, Wiper and Washer are normal.
INTERIOR LIGHT SYSTEM:
Symptom Suspect Area See page
1. Door Courtesy Switch BE-31
"Illuminated Entry System" does not operate. 2. Body ECU (Integration Relay) DI-628
3. Wire Harness -
1. Bulb -
Only one interior light does not light up.
2. Wire Harness -
1. DOME Fuse (E/G Room J/B No.2) -
Interior light does not light up (All).
2. Wire Harness -
1. Bulb -
Dome light does not light up. 2. Dome Light BE-31
3. Wire Harness -
1. Bulb -
Map light does not light up. 2. Front Interior Light BE-31
3. Wire Harness -
BACK-UP LIGHT SYSTEM:
Symptom Suspect Area See page
1. Bulb -
2. GAUGE Fuse (Driver Side J/B No.1) -
Back-up Light does not light up.
3. Ignition Switch BE-15
4. Wire Harness -
1. Park/Neutral Position Switch (A/T) DI-197
Back-up Light remains always ON.
2. Wire Harness -
1. Bulb -
Only one light does not light up.
2. Wire Harness -
STOP LIGHT SYSTEM:
Symptom Suspect Area See page
1. STOP Fuse (Driver Side J/B No.1) -
Stop light does not light up. 2. Stop Light Switch BE-35
3. Wire Harness -
Only one light always lights up. 1. Wire Harness -
1. Bulb -
Only one light does not light up
2. Wire Harness -
WIPER AND WASHER SYSTEM:
Symptom Suspect Area See page
1. WIPER Fuse (Driver Side J/B No.1) -
2. Wiper Switch BE-37
Wiper and washers does not operate.
3. Wiper Motor BE-37
4. Wire Harness -
1. Wiper Switch BE-37
Wipers do not operate in LO or HI. 2. Wiper Motor BE-37
3. Wire Harness -
2001 SIENNA (RM787U)
Author : Date : 1522
BE-5
BODY ELECTRICAL - TROUBLESHOOTING
1. Wiper Switch BE-37
Wipers do not operate in INT. 2. Wiper Motor BE-37
3. Wire Harness -
1. Washer Switch BE-37
Washer motor does not operate. 2. Washer Motor BE-37
3. Wire Harness -
1. Washer Motor BE-37
Wipers do not operate when washer switch is in ON.
2. Wire Harness -
Washer fluid does not operate. 1. Washer Hose and Nozzle -
D In wiper switch HI position, the wiper blade is in contact with
1. *1Wiper Switch BE-37
the body.
2. Wire Harness -
D When the wiper switch is OFF, the wiper blade does not
retract or the retract position is wrong.
1. Wiper Fuse (Driver Side J/B NO.1) -
2. Rear Wiper Relay BE-37
Rear wiper and washer does not operate. 3. Rear Wiper and washer Switch BE-37
4. Rear Wiper Motor BE-37
5. Wire Harness -
*1: Inspect wiper arm and blade set position
COMBINATION METER (Meter Gauges and Illumination):
Symptom Suspect Area See page
1. GAUGE Fuse (Driver Side J/B No.1) -
Tachometer, Fuel Gauge and Engine Coolant Temperature Gauge
2. Meter Circuit Plate BE-43
do not operate.
3. Wire Harness -
1. ABS ECU IN-31
Speedometer does not operate. 2. Meter Circuit Plate BE-43
3. Wire Harness -
1. Igniter IG-1
Tachometer does not operate. 2. Meter Circuit Plate BE-43
3. Wire Harness -
1. Fuel Receiver Gauge BE-48
2. Fuel Sender Gauge BE-48
Fuel Gauge does not operate or abnormal operation.
3. Meter Circuit Plate BE-43
4. Wire Harness -
1. Engine Coolant Temperature Receiver Gauge BE-48
Engine Coolant Temperature Gauge does not operate or abnormal 2. Engine Coolant Temperature Sender Gauge BE-48
operation 3. Meter Circuit Plate BE-43
4. Wire Harness -
1. PANEL Fuse (Driver Side J/B No.1) -
All illumination lights do not light up. 2. Light Control Rheostat BE-48
3. Wire Harness -
1. Bulb -
Brightness does not change even when rheostat is turned.
2. Wire Harness -
1. Bulb -
Only one illumination light does not light up.
2. Wire Harness -
COMBINATION METER (Warning Light):
Symptom Suspect Area See page
1. GAUGE Fuse (Diver Side J/B No.1) -
Warning lights do not light up. (Except Discharge, Open Door and
2. Meter Circuit Plate BE-43
SRS)
3. Wire Harness -
2001 SIENNA (RM787U)
Author : Date : 1523
BE-6
BODY ELECTRICAL - TROUBLESHOOTING
1. Bulb -
2. Low Oil Pressure Warning Switch BE-48
Low oil pressure warning light does not light up.
3. Meter Circuit Plate BE-43
4. Wire Harness -
1. Bulb -
2. Fuel Level Warning Switch BE-48
Fuel level warning light does not light up.
3. Meter Circuit Plate BE-43
4. Wire Harness -
1. Bulb -
ABS warning light does not light up. 2. ABS ECU DI-250
3. Wire Harness -
1. Bulb -
2. Retractor switch BE-48
Seat belt warning light does not light up.
3. Body ECU (Integration Relay) DI-628
4. Wire Harness -
1. Bulb -
2. Parking Brake Switch BE-48
3. Brake Fluid Level Warning Switch BE-48
Brake warning light does not light up.
4. Bulb Check Relay BE-48
5. Meter Circuit Plate BE-43
6. Wire Harness -
1. ECU-B Fuse (E/G Room J/B No.2) -
2. Bulb -
SRS warning light does not light up. 3. Airbag Sensor Assembly DI-490
4. Meter Circuit Plate BE-43
5. Wire Harness -
1. DOME Fuse (E/G Room J/B No.2) -
2. Bulb -
Open door warning light does not light up. 3. Door Courtesy Switch BE-31
4. Meter Circuit Plate BE-43
5. Wire Harness -
1. Bulb -
2. Washer Fluid Level Warning Switch BE-48
Washer level warning light does not light up.
3. Meter Circuit Plate BE-43
4. Wire Harness -
COMBINATION METER (Indicator Light):
Symptom Suspect Area See page
1. Bulb -
2. O/D OFF Switch DI-204
O/D OFF indicator light does not light up.
3. Meter Circuit Plate BE-43
4. Wire Harness -
1. Bulb -
2. Cruise Control ECU DI-601
Cruise control indicator light does not light up.
3. Meter Circuit Plate BE-43
4. Wire Harness -
1. Bulb -
2. Meter Circuit Plate BE-43
High beam indicator light does not light up.
3. Wire Harness -
4. Headlight System BE-18
1. Bulb -
2. Meter Circuit Plate BE-43
Turn indicator light does not light up.
3. Wire Harness -
4. Turn Signal and Hazard Warning System BE-29
2001 SIENNA (RM787U)
Author : Date : 1524
BE-7
BODY ELECTRICAL - TROUBLESHOOTING
1. Bulb -
2. Meter Circuit Plate BE-43
Shift indicator lights do not light up.
3. Park/Neutral Position Switch DI-197
4. Wire Harness -
1. Bulb -
Only one shift indicator does not light up.
2. Meter Circuit Plate BE-43
1. Bulb -
2. ECM -
Malfunction indicator light does not light up.
3. Meter Circuit Plate BE-43
4. Wire Harness -
Indicator lights do not light up. (Except Turn, Hi-beam and 1. GAUGE Fuse (Driver Side J/B No.1) -
security) 2. Wire Harness -
DEFOGGER SYSTEM:
Symptom Suspect Area See page
1. DEF Fuse (Driver Side J/B No.1) -
2. HTR Fuse (Driver Side J/B No.1) -
All defogger systems do not operate. 3. Defogger Relay (Driver Side J/B No.1) BE-61
4. Defogger Switch BE-61
5. Wire Harness -
1. Defogger Wire BE-61
Rear window defogger does not operate. 2. Choke Coil -
3. Wire Harness -
1. MIR/HTR Fuse (Driver Side J/B No.1) -
Mirror defogger does not operate. 2. Mirror Defogger BE-61
3. Wire Harness -
POWER WINDOW CONTROL SYSTEM:
Symptom Suspect Area See page
1. POWER Fuse (Driver Side J/B No.1) -
Power window does not operate (ALL).
2. Power Relay (Driver Side J/B No.1) BE-65
(Power Door Lock does not operate)
3. Wire Harness -
1. Ignition Switch BE-15
Power window does not operate (ALL).
2. Power Window Master Switch BE-65
(Power Door Lock is normal)
3. Wire Harness -
"One Touch Power Window System" does not operate. 1. Power Window Master Switch BE-65
1. Power Window Master Switch BE-65
2. Power Window Switch BE-65
Only one window glass does not move.
3. Power Window Motor BE-65
4. Wire Harness -
"Window Lock System" does not operate. 1. Power Window Master Switch BE-65
"Window Lock Illumination" does not light up. 1. Power Window Master Switch BE-65
1. GAUGE Fuse (Driver Side J/B No.1) -
2. Body ECU (Integration Relay) DI-628
Key-of f power window does not operate. 3. Ignition Switch BE-15
4. Door Courtesy Switch BE-31
5. Wire Harness -
POWER DOOR LOCK CONTROL SYSTEM:
Symptom Suspect Area See page
1. POWER Fuse (Driver Side J/B No.1) -
2. GAUGE Fuse (Driver Side J/B No.1) -
"Door lock system" does not operate at all. 3. DOOR Fuse (Driver Side J/B No.1) -
4. Body ECU (Integration Relay) DI-628
5. Wire Harness -
2001 SIENNA (RM787U)
Author : Date : 1525
BE-8
BODY ELECTRICAL - TROUBLESHOOTING
1. Power Window Master Switch BE-73
2. Door Lock Manual Switch BE-73
Door lock system does not operate by manual switch.
3. Body ECU (Integration Relay) DI-628
4. Wire Harness -
1. Door Key Lock and Unlock Switch BE-73
2. Body ECU (Integration Relay) DI-628
Door lock system does not operate by door key.
3. Wire Harness -
4. Door Lock Link Disconnected -
1. Door Key Lock and Unlock Switch BE-73
Fault in 2-Operation unlock function of Driver's side door key lock
2. Body ECU (Integration Relay) DI-628
and unlock switch.
3. Wire Harness -
1. Body ECU (Integration Relay) DI-628
2. Key Unlock Warning Switch BE-15
Fault in key confine prevention operate.
3. Door Courtesy Switch BE-31
4. Wire Harness -
1. Door Lock Motor BE-73
Only one door lock does not operate.
2. Wire Harness -
WIRELESS DOOR LOCK CONTROL SYSTEM:
HINT:
S Troubleshooting of the wireless door lock control system is based on the premise that the door lock
control system, power slide door control system and theft deterrent system are operating normally. Ac-
cordingly, before troubleshooting the wireless door lock control system, first make certain that the door
lock control system, power slide door control system and theft deterrent system are operating normally.
S If the trouble still reappears even though there are no abnormalities in any of the other circuits, check
and replace the Wireless Door Lock Receiver as the last step.
Symptom Suspect Area See page
1. Door Courtesy Switch BE-31
2. Door Key Lock and Unlock Switch BE-73
3. Key Unlock Warning Switch BE-15
All functions of wireless door lock control system do not operate.
4. Body ECU (Integration Relay) DI-628
5. Wire Harness -
6. Wireless Door Lock Receiver BE-85
1. Door key Lock and Unlock Switch BE-73
2. Door Unlock Detection Switch BE-73
Only door unlock operation is not possible
3. Body ECU (Integration Relay) DI-628
(Lock operation is possible).
4. Wire Harness -
5. Wireless Door Lock Receiver BE-85
1. Door key Lock and Unlock Switch BE-73
Only door lock operation is not possible 2. Body ECU (Integration Relay) DI-628
(Unlock operation is possible). 3. Wire Harness -
4. Wireless Door Lock Receiver BE-85
1. Key Unlock Warning Switch BE-15
2. Body ECU (Integration Relay) DI-628
Only key confinement prevention function is not possible.
3. Wire Harness -
4. Wireless Door Lock Receiver BE-85
1. Slide Door ECU Communication circuit IN-21
2. Body ECU (Integration Relay) DI-628
Only power side door of wireless door lock control system does
3. Wire Harness -
not operate.
4. Wireless Door Lock Receiver BE-85
5. Power Slide Door Contorol ECU DI-501
2001 SIENNA (RM787U)
Author : Date : 1526
BE-9
BODY ELECTRICAL - TROUBLESHOOTING
S Wireless door lock function operates even when each door is
1. Door Courtesy Switch BE-31
opened.
2. Body ECU (Integration Relay) DI-628
S Automatic lock function operates even if any door is opened
3. Wire Harness -
within 30 seconds after all doors are unlocked by wireless door
4. Wireless Door Lock Receiver BE-85
lock control system.
1. Door Unlock Detection Switch BE-73
Wireless door lock functions incorrectly.
2. Body ECU (Integration Relay) DI-628
(Although one door is unlocked, when the transmitter switch is
3. Wire Harness -
pressed, all doors are unlocked.)
4. Wireless Door Lock Receiver BE-85
1. Body ECU (Integration Relay) DI-628
Warning operation will not be performed even if the panic button is 2. Wire Harness -
pressed. 3. Wireless Door Lock Receiver BE-85
1. Theft Deterrent ECU Communication Circuit -
SLIDING ROOF SYSTEM:
Symptom Suspect Area See page
1. POWER Fuse (Driver Side J/B No.1) -
Sliding roof system does not operate.
2. Power Relay (Driver Side J/B No.1) BE-65
(Door Lock does not operate)
3. Wire Harness -
1. Ignition Switch BE-15
Sliding roof system does not operate. 2. Sliding Roof Control Relay and Switch BE-95
(Door Lock is normal) 3. Sliding Roof Motor and Limit Switch BE-95
4. Wire Harness -
1. Sliding Roof Control Relay and Switch BE-95
Sliding roof system operates abnormally. 2. Sliding Roof Motor and Limit Switch BE-95
3. Wire Harness -
1. Sliding Roof Control Relay and Switch BE-95
Sliding roof system stops operation half way.
2. Sliding Roof Motor and Limit Switch BE-95
(Stones of foreign material trapped in motor assembly)
3. Wire Harness -
1. DOME Fuse (E/G Room J/B No.2) -
2. GAUGE Fuse (J/B No.1) -
"Key-of f Sliding Roof" operation does not operate. 3. Ignition Switch BE-15
4. Body ECU (Integration Relay) DI-628
5. Wire Harness -
POWER SEAT CONTROL SYSTEM:
Symptom Suspect Area See page
1. POWER Fuse (Driver Side J/B No.1) -
Power seat does not operate. 2. Power Seat Switch BE-99
(Door lock system does not operate) 3. Power Seat Moter BE-99
4. Wire Harness -
Power seat does not operate. 1. Power Seat Swtich BE-99
(Door lock system is normal) 2. Wire Harness -
1. Power Seat Switch BE-99
"Slide operation" does not operate. 2. Wire Harness -
3. Slide Motor BE-99
1. Power Seat Switch BE-99
"Lifter operation" does not operate. 2. Wire Harness -
3. Lifter Motor BE-99
1. Power Seat Switch BE-99
"Reclining operation" does not operate. 2. Wire Harness -
3. Reclining Motor BE-99
2001 SIENNA (RM787U)
Author : Date : 1527
BE-10
BODY ELECTRICAL - TROUBLESHOOTING
POWER MIRROR CONTROL SYSTEM:
Symptom Suspect Area See page
1. CIG Fuse (Driver Side J/B No.1) -
2. Mirror Switch BE-102
Mirror does not operate.
3. Mirror Motor BE-102
4. Wire Harness -
1. Mirror Switch BE-102
Mirror operates abnormally. 2. Mirror Motor BE-102
3. Wire Harness -
ELECTRO CHROMIC MIRROR SYSTEM
Symptom Suspect Area See page
1. GAUGE Fuse (Driver Side J/B NO.1) -
Electro Chromic Inner Mirror does not operate. 2. Electro Chromic Inner Mirror BE-106
3. Wire Harness -
1. GAUGE Fuse (Driver Side J/B NO.1) -
2. Electro Chromic Outer Mirror BE-106
Electro Chromic Outer Mirror does not operate.
3. Electro Chromic Inner Mirror BE-106
4. Wire Harness -
SEAT HEATER SYSTEM
Symptom Suspect Area See page
1. GAUGE Fuse (Driver Side J/B NO.1) -
2. SEAT HTR Relay BE-108
Seat heaters do not operate.
3. Seat Heater Switch (D, P) BE-108
(Driver's and Passenger's)
4. Wire Harness -
5. Seat Heater BE-108
1. Seat Heater Switch (D, P) BE-108
Driver's seat heater does not operate.
2. Wire Harness -
1. Seat Heater Switch (D, P) BE-108
Passenger's seat heater does not operate.
2. Wire Harness -
Seat heater temperature is too hot. Seat Heater BE-108
AUDIO SYSTEM
Symptom Suspect Area See page
Audio system abnormal operation. TROUBLESHOOTINGS BE-1 14
CLOCK SYSTEM
Symptom Suspect Area See page
Passenger seat belt warning system does not light up. TROUBLESHOOTING NO.1 BE-140
Clock will not operate. TROUBLESHOOTING NO.1 BE-140
Clock loses or gains time. TROUBLESHOOTING NO.2 BE-140
GARAGE DOOR OPENER SYSTEM
Symptom Suspect Area See page
1. Garage Door Opener Switch BE-147
The equipment of which code has been registered does not oper-
2. Wire Harness -
ate.
3. * -
1. Garage Door Opener Switch BE-147
LED does not light up. (Even though either switch is pressed.)
2. Wire Harness -
LED does not light up. (Only one switch is pressed.) Garage Door Opener Switch BE-147
* As the GARAGE DOOR OPENER on the vehicle side seems to be normal, check the OPENER on the
equipment side, of which code has been registered.
2001 SIENNA (RM787U)
Author : Date : 1528
BE-1 1
BODY ELECTRICAL - TROUBLESHOOTING
ENGINE IMMOBILIZER SYSTEM
Symptom Suspect Area See page
Engine immobilizer system does not operate. See DIAGNOSIS SYSTEM DI-606
2001 SIENNA (RM787U)
Author : Date : 1529
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