2001 TOYOTA PRIUS warning light

± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±675
2001 PRIUS (RM778U) Trip meter cannot be reset.
1. ODO/TRIP switch
2. Combination meter ECU
Display cannot be shifted among ODO, TRIPA and TRIPB.1. ODO/TRIP switch
2. Combination meter ECU
Without resetting, the display returns to 0.0 km.1. ODO/TRIP switch
2. +B wire harness
3. Combination meter ECU
Error of accumulated distance is large.1. Accessory that utilizes vehicle speed signals.
2. GND wire harness
3. Brake ECU
4. Wire harness and connector
5. Combination meter ECU
Others:
SymptomSuspect area
Some indicators or warning lights are always ON.1. Meter circuit plate
2. Corresponding switch and ECU
3. Combination meter ECU
4. Multiplex communication circuit
Some indicators or warning lights do not light up.1. Bulb
2. Meter circuit plate
3. Corresponding switch and ECU
4. Combination meter ECU
5. Multiplex communication circuit
Buzzer does not stop.1. Combination meter ECU
2. Corresponding switch and ECU

± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±681
2001 PRIUS (RM778U)
5. Indicators or warning lights do not light up. (*multiplex communication circuit input
indicator or warning)
INSPECTION PROCEDURE
1 Multiplex communication circuit input indicator or warning.
2 Communication check.
CHECK:
Check if the communication between the combination meter and the multiplex communication circuit is nor-
mal or not.
Ye s
No Communication error. Wire harness faulty.
3 Check the bulb or circuit plate.
CHECK:
Check if the bulb circuit plate is normal or not. Check open or short circuit in wire harness.
Ye s
No Bulb or circuit plate faulty.
DI7XX±01

DI62G±07
DI±688
± DIAGNOSTICSBODY CONTROL SYSTEM
2001 PRIUS (RM778U)
PROBLEM SYMPTOMS TABLE
POWER WINDOW CONTROL SYSTEM
SymptomSuspect AreaSee page
All the power windows does not operate.
3. Master switch circuit
4. Driver door ECU with master switch
5. Body ECUDI±724
DI±730
IN±41
Power window does not operate.1. Power window switch circuit
2. Body ECUDI±726
IN±41
DOOR LOCK CONTROL
SymptomSuspect AreaSee page
Lock or unlock cannot be operated with door lock control S/W.
1. Door lock control switch circuit
(Master switch)
2. Body ECUDI±706
DI±724
IN±41
Door key linked function does not operate.1. Door key lock and unlock switch circuit
2. Body ECUDI±708
IN±41
Key confinement prevention function does not operate.1. Key unlock switch circuit
2. Body ECUDI±695
IN±41
Does not lock and unlock each door only.1. Door lock motor circuit
2. Body ECUDI±712
IN±41
Luggage compartment door opener function does not operate.1. Luggage component door courtesy switch circuit
2. Body ECUDI±722
IN±41
WIRELESS DOOR LOCK CONTROL
SymptomSuspect AreaSee page
All function of wireless door lock control system do not operate.
1. Transmitter
2. Wireless tuner circuit
3. Key unlock warning switch circuit
4. Body ECUBE±83
DI±728
DI±695
IN±41
Lock (or unlock) function does not operate.
1. Door key lock and unlock switch circuit
2. Door unlock detection switch circuit
3. Body ECUDI±708
DI±710
IN±41
Automatic lock function operates even if any door is opened within
30 seconds after all doors are unlocked by wireless door lock
control system .1. Door courtesy switch circuit
2. Body ECUDI±714
IN±41
ILLUMINATED ENTRY
SymptomSuspect AreaSee page
Illuminated entry does not operate.
1. Driver door courtesy switch circuit
2. Illuminaction circuit
3. Body ECUDI±714
DI±702
IN±41
HEADLIGHT AND TAILLIGHT SYSTEM:
SymptomSuspect AreaSee page
Headlight does not light up.
1. Light control switch circuit
2. Headlight control relay circuit
3. Body ECUDI±689
DI±693
IN±41
Taillight does not light up.
1. Light control switch circuit
2. Taillight control relay circuit
3. Body ECUDI±689
DI±691
IN±41
Auto turn±off system does not operate.1. Driver door courtesy switch circuit
2. Body ECUDI±714
IN±41

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±689
2001 PRIUS (RM778U)
OTHERS
SymptomSuspect AreaSee page
Does not turn off the driver seat belt warning light1. Driver buckle switch circuit
2. Body ECUDI±716
IN±41
Does not turn off the passenger seat belt warning light.1. Passenger buckle switch circuit
2. Body ECUDI±718
IN±41
Theft deterrent indicator light does not blink when system is set.1. Indicator light circuit
2. Body ECUDI±704
IN±41
Body ECU does not operate.
1. Power source circuit
2. Body ECUDI±685
IN±41

I15488
5
8
1
2
11
8
8 A
E DA
AA
AB9
DBKL
IJ1
J22
J23 IJ1J24 J24
2D 2K
IDJ11
J/CG±O
W±B
W±B W±BW±B
W±B W±BG±O
G±O B20
Buckle SW LH
Instrument Panel J/BJ29
J/CBody ECU
J/C
± DIAGNOSTICSBODY CONTROL SYSTEM
DI±721
2001 PRIUS (RM778U)
Driver Buckle Switch Circuit
CIRCUIT DESCRIPTION
When the buckle switch of the driver's seat is ON with the ignition switch ON, the body ECU sends a signal
to make the seat belt warning light for the driver's seat light up and to sound a buzzer.
When the buckle switch of the passenger seat is ON and the passenger seat belt occupant detecting sensor
is ON with the ignition switch ON, the body ECU sends a signal to make the seat belt warning light for the
passenger seat light up.
WIRING DIAGRAM
DI6R2±04

± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±789
2001 PRIUS (RM778U)
DTC B1293/93 Gateway ECU communication stop
CIRCUIT DESCRIPTION
This DTC is output when communication stops between gateway ECU and body ECU.
DTC No.DTC Detecting ConditionTrouble Area
B1293/93N i ti f t ECU th 10 d
Gateway ECUB1293/93No communication from gateway ECU more than 10 seconds.
Gateway ECU

Wireharness
WIRING DIAGRAM
See page DI±770
INSPECTION PROCEDURE
1 Check open door warning light.
CHECK:
Connection that the gateway ECU and BEAN (Body Electrical Area Network) can be checked by DTC trans-
mitted by the body ECU.
See ºINSPECT OPEN DOOR INDICATOR LIGHT on page DI±752.
NG Replace the gateway ECU.
OK
DI1SY±05

± HYBRID VEHICLE CONTROLCONVERTER AND INVERTER ASSEMBLY
HV±23
2001 PRIUS (RM778U)
5. OPERATION AFTER REPLACING CONVERTER & IN-
VERTER ASSEMBLY
Even if the master warning light is not lit, clear DTC using a
TOYOTA hand±held tester. When replacing a converter & in-
verter assembly of the vehicle in which no error occurs, also
clear DTC using a TOYOTA hand held tester.
HINT:
When a TOYOTA hand±held tester cannot be used, disconnect
the auxiliary battery for 1 min. or more and connect it again.
6. CHECKING AFTER REPLACING CONVERTER & IN-
VERTER ASSEMBLY
Depressing the accelerator pedal to a degree of 50 %, increase
the speed up to approx. 15 km/h 3 or 4 times to check that there
is no problem in the inverter operation.

± BRAKETROUBLESHOOTING
BR±3
1518 Author: Date:
2001 PRIUS (RM778U) Noise from brakes
1. Pad or lining (Cracked or distorted)
2. Installation bolt (Loose)
3. Disc or drum (Scored)
4. Pad support plate (Loose)
5. Sliding pin (Worn)
6. Pad or lining (Dirty)
7. Pad or lining (Glazed)
8. Tension or return spring (Faulty)
9. Anti±squeal shim (Damaged)
10.Shoe hold±down spring (Damaged)BR±23
BR±32
BR±26
BR±26
BR±32
BR±23
BR±26
BR±23
BR±32
BR±23
BR±32
BR±32
BR±23
BR±32
Brake warning light lights up*1
(Parking brake pedal released)
1. Brake fluid level
2. Hydraulic brake booster power supply system (Faulty)
BR±41
Brake warning light lights up and brake warning buzzer sounds*2Hydraulic brake booster power supply system (Faulty)BR±41
ABS warning light lights up*31. Anti±lock brake system (Faulty)
2. Hydraulic brake booster power supply system (Faulty)
BR±41
*1, *3: The light may stay on for about 60 seconds after the engine has been started. It is normal if it goes
out after a while.
*
2, *3: Depressing the brake pedal repeatedly may turn on the warning light and buzzer. It is normal if the
light goes out and the buzzer stops sounding after a few seconds.