2001 TOYOTA PRIUS ignition system

2001 PRIUS (EWD414U)
WIRELESS DOOR LOCK CONTROL
The current is always sent from DOOR fuse to TERMINAL B of body ECU. At the same time, the current is always sent from
DOME fuse to TERMINAL CPUB of power window master SW, and from ECU±B fuse to wireless door lock receiver. When
ignition SW is turned on, the current is sent from GAUGE fuse to TERMINAL IG of body ECU.
1. WIRELESS DOOR LOCK OR UNLOCK NORMAL OPERATION
*Lock operation
When the LOCK SW of the transmitter is pushed, all the doors are locked.
*Unlock operation
When the UNLOCK SW of the transmitter is pushed, all the doors are unlocked.
2. AUTOMATIC LOCK OPERATION
After all the doors are unlocked by pushing the UNLOCK SW of the transmitter, unless each of the doors is opened or the
ignition key is inserted, all the doors are locked again.
3. VISUAL CONFIRMATION OF LOCK OR UNLOCK FUNCTION
When doors are locked by using the transmitter, the taillight and parking lights blink once. When doors are unlocked by using
the transmitter, the taillights and parking lights blink twice. If UNLOCK SW of the transmitter is pushed while all the doors are
locked, doors are unlocked and the room lights are turned on simultaneously.
4. WIRELESS CONTROL STOP FUNCTION
If the following situations occur, wireless door lock function does not operate.
*When each of the doors opens. (Door courtesy SW is on)
*When ignition key is inserted to ignition SW. (Unlock warning SW is on)
*When ignition SW is on.
5. REPEAT FUNCTION
If the doors are not locked after the lock signal is out put from transmitter by pushing LOCK SW, the lock signal is sent again
to lock the doors.
6. PANIC MODE FUNCTION
When the panic SW of the transmitter is pushed, the horn comes on, and the headlight and taillight flashes.
B8 (A), B9 (B) BODY ECU
15±GROUND : Approx. 12 volts with the ignition SW at ON position
8±GROUND : Always approx. 12 volts
(B) 1±GROUND : Always continuity
W5 WIRELESS DOOR LOCK CONTROL RECEIVER
5±GROUND : Always approx. 12 volts
1±GROUND : Always continuity
U1 UNLOCK WARNING SW
2±1 : Closed with the ignition key in the cylinder
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
B8A36D1438J23B37
B9B36J1137J24A37
D436J12A37J25B37
D638J13B37J2737
D738J14A37J3338
D838J15B37L438
D938J1637P939
D1038J1737U137
D1138J18A37W537
D1238J19B37
D1338J22A37
SYSTEM OUTLINE
SERVICE HINTS

2001 PRIUS (EWD414U)
NAVIGATION SYSTEM
N2 (A) NAVIGATION ECU
(A) 9±GROUND : Always approx. 12 volts
(A)18±GROUND : Approx. 12 volts with the ignition SW at ON or ACC position
(A)17±GROUND : Always continuity
M7 (C) MULTI DISPLAY
(C)2±GROUND : Approx. 12 volts with the ignition SW at ON position
(C)4±GROUND : Approx. 12 volts with the ignition SW at ON or ACC position
(C)6±GROUND : Always continuity
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
B536J1437M6B37
C736J2137M7C37
C10A36J24A37N2A39
C11B36J25B37N3B39
D236J2637P237
G137J27A37R437
J12A37J28B37
J13B37M5A37
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1J27Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
2A
2B30Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)2C30Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)
2D
2G31Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)
2I31Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
ID142Instrument Panel Wire and Cowl Wire (Left Kick Panel)
IJ144Floor No.3 Wire and Instrument Panel Wire (Under the Instrument Panel Center)
: GROUND POINTS
CodeSee PageGround Points Location
IF42Left Kick Panel
IH42Right Kick Panel
: SPLICE POINTS
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
I544Instrument Panel Wire
SERVICE HINTS

2001 PRIUS (EWD414U)
EMPS
In this system, the controller determines the direction and the amount of the assistant force based on the signals from the
vehicle speed sensor and the torque sensor that is built in the gear box. The controller then assists the operation of the
steering wheel by controlling the DC motor installed in the steering gear box.
E5 (C), E6 (D) EMPS ECU
(D) 5±GROUND : Approx. 12 volts with the ignition SW at ON position
(C) 2±GROUND : Always continuity
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
B1136E5C36J18A37
C1036E6D36J19B37
D134J14A37J2237
D236J15B37J2637
E3A36J1637S135
E4B36J1737
: RELAY BLOCKS
CodeSee PageRelay Blocks (Relay Block Location)
324Engine Room R/B No.3 (Engine Compartment Right)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
2A30Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)2B30Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)
2G31Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)
2I31Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
IA242Engine Room Main Wire and Cowl Wire (Cowl Side Panel LH)
ID142Instrument Panel Wire and Cowl Wire (Left Kick Panel)
IM144Engine Room Main Wire and Cowl Wire (Right Kick Panel)
IO144Engine Wire and Cowl Wire (Right Kick Panel)
IP144Instrument Panel Wire and Cowl Wire (Right Kick Panel)
: GROUND POINTS
CodeSee PageGround Points Location
IG42Cowl Side Panel RH
IH42Right Kick Panel
: SPLICE POINTS
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
I744Engine Wire
SYSTEM OUTLINE
SERVICE HINTS

2001 PRIUS (EWD414U)
SRS
NOTICE: When inspecting or repairing the SRS, perform the operation in accordance with the following precautionary
instructions and the procedure and precautions in the Repair Manual for the applicable model year.

Malfunction symptoms of the SRS are difficult to confirm, so the DTCs become the most important source of information
when troubleshooting. When troubleshooting the SRS, always inspect the DTCs before disconnecting the battery.

Work must be started after 90 seconds from when the ignition switch is turned to the ºLOCKº position and the
negative (±) terminal cable is disconnected from the battery.
(The SRS is equipped with a back±up power source so that if work is started within 90 seconds from
disconnecting the negative (±) terminal cable of the battery, the SRS may be deployed.)

When the negative (±) terminal cable is disconnected from the battery, the memory of the clock and audio system will be
canceled. So before starting work, make a record of the contents memorized in the audio memory system. When work is
finished, reset the audio systems as they were before and adjust the clock. To avoid erasing the memory in each
memory system, never use a back±up power supply from outside the vehicle.

Before repairs, remove the airbag sensor if shocks are likely to be applied to the sensor during repairs.

Do not expose the steering wheel pad, front passenger airbag assembly, side airbag assembly, seat belt pretensioner,
airbag sensor assembly or side airbag sensor directly to hot air or flames.

Even in cases of a minor collision where the SRS does not deploy, the steering wheel pad, front passenger airbag
assembly, side airbag assembly, seat belt pretensioner, airbag sensor assembly and side airbag sensor assembly
should be inspected.

Never use SRS parts from another vehicle. When replacing parts, replace them with new parts.

Never disassemble and repair the steering wheel pad, front passenger airbag assembly, side airbag assembly, seat belt
pretensioner, airbag sensor assembly or side airbag sensor assembly in order to reuse it.

If the steering wheel pad, front passenger airbag assembly, side airbag assembly, seat belt pretensioner, airbag sensor
assembly or side airbag sensor assembly has been dropped, or if there are cracks, dents or other defects in the case,
bracket or connector, replace them with new ones.

Use a volt/ohmmeter with high impedance (10 kW/V minimum) for troubleshooting the system's electrical circuits.

Information labels are attached to the periphery of the SRS components. Follow the instructions on the notices.

After work on the SRS is completed, perform the SRS warning light check.

If the vehicle is equipped with a mobile communication system, refer to the precaution in the IN section of the Repair
Manual.

2001 PRIUS (EWD414U)
SRS
C 1
D 11B 215A
AM2 1J 976AM2 AM1ACC
IG1
IG2
ST2
1 2 2 1 2 1 12
SPIRAL
CABLE B 14 B13 B10 B11 A6A5C2C1 10A
SRS ACC FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
2E 4
2B 5
2E 2
B 5B6B23 A7A10 A12 A9C12 C9C7C104 3 2 1 4 3 2 1 3
SIDE AIRBAG
SQUIB RH S 7
SIDE AIRBAG
SQUIB LH S 6
AIRBAG SQUIB
(
FRONT PASSENGER
AIRBAG ASSEMBLY) A20
AIRBAG SQUIB
(
STEERING
WHEEL PAD) A21 IGNITION SW I15
SIDE AIRBAG SENSOR RH S 5
SIDE AIRBAG SENSOR LH S 4
HYBRID VEHICLE
CONTROL ECU H13
FUSIBLE
LINK
BLOCK
NO. 1D F1 2 , F13CAIRBAG SENSOR ASSEMBLYB A17 , A18AC, A19 ABFS
B±G B W±R W±R
B±W B±O
GR
L
P±L
L±W
LG±B
GR ±L
P
L±Y
LG
GR Y±B
Y
Y±R
Y±G
Y±R
Y±G
Y±G
Y±R
BATTERYD+ D± P+ P± SFL+ SFR±SFL± SFR+ IG2 ACC GSW2 VUPL SSL+ SSL± ESL VUPR SSR+ SSR± ESR
GR
2C 2
2G 1
120A MAIN
1
FUSIBLE
LINK BLOCK
NO. 2 F18
1 212 A 2A1C5C6
P15
PRETENSIONER
RH PRETENSIONER
LH P14
Y±B
Y
Y±B
Y
PL+ PL± PR+ PR±
P±L
(
*1)
(
*1)
(
*1)
(
*1)
(
*1)
(
*1)
(
*1)
(
*1) (
*1) (
*1) (
*1) (
*1)

2001 PRIUS (EWD414U)
SRS
The SRS is a driver and front passenger protection device which has a supplemental role to the seat belts.
When the ignition SW is turned to ACC or ON, current from the SRS ACC fuse flows to TERMINAL (B) 6 of the airbag sensor
assembly. Only when the ignition SW is on does the current flow TERMINAL (B) 5 of the airbag sensor assembly.
If an accident occurs while driving, when the frontal impact exceeds a set level, current flows to TERMINALS (B) 14, (B) 10,
(A) 2 and (C) 5 of the airbag sensor assembly to TERMINAL 1 of the airbag squibs and the pretensioners to TERMINAL 2 to
TERMINALS (B) 13, (B) 11, (A) 1 and (C) 6 of the airbag sensor assembly to TERMINAL (B) 27, (B) 28 or BODY GROUND
to GROUND, so that current flows to the front airbag squibs and the pretensioners and causes them to operate.
When the side impact also exceeds a set level, current from the ignition SW (IG2) or SRS ACC fuse flows to TERMINALS
(A) 5, (C) 2, (A) 2 and (C) 5 of the airbag sensor assembly to TERMINAL 1 of the side airbag squibs and the pretensioners to
TERMINAL 2 to TERMINALS (A) 6, (C) 1, (A) 1 and (C) 6 of the airbag sensor assembly to TERMINAL (B) 27, (B) 28 or
BODY GROUND to GROUND, causing side airbag squibs and the pretensioners to operate.
The airbag stored inside the steering wheel pad is instantaneously expanded to soften the shock to the driver.
The airbag stored inside the passenger's instrument panel is instantaneously expanded to soften the shock to the front
passenger.
Side airbags are instantaneously expanded to soften the shock of side to the driver and front passenger (w/ side airbags).
The pretensioners make sure of the seat belt restrainability.
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A17A36F134J25B37
A18B36F234J2637
A19C36F12C34J27A37
A2036F13D34J28B37
A2136F1838J2937
B936H1337P1439
B2038I1537P1539
B2138J1137S439
C10A36J22A37S539
C11B36J23B37S639
D236J24A37S739
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1B27Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)1J27Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
2A
2B
2C30Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)
2D
()
2E
2G31Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)
2K31Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
IJ144Floor No.3 Wire and Instrument Panel Wire (Under the Instrument Panel Center)
IL144Instrument Panel Wire and Engine Room Main Wire (Right Kick Panel)
: GROUND POINTS
CodeSee PageGround Points Location
ID42Cowl Side Panel LH
IH42Right Kick Panel
SYSTEM OUTLINE

2001 PRIUS (EWD414U)
ABS
C 1
D 11B 215A
AM2 1J 92C 2
2G 176AM2 IG2
ST220A
ABS NO. 3
1K30A
ABS NO. 2
1K40A
ABS NO. 1 FROM POWER SOURCE SYSTEM (
SEE PAGE 50)
3
22 22
24 13
24 13
22 2236 21433
33 3 IA214
B±G B W±R W±R
B±W
W±L
B
W±R R W±B LG±RG Y±G G± W
B±W
R
L±O
Y±B
B±L
LG±R
Y±G
G
G±W
W±B
HYDRO MTR
NO. 1 RELAY
HYDRO MTR
NO. 2 RELAY
ABS SOL RELAY
BATTERYFUSIBLE LINK
BLOCK NO. 2F18 FUSIBLE LINK
BLOCK NO. 1D F12 , F13C
1
120A
MAINIGNITION SW I15
Y±B L±OY±B 6411
22

2001 PRIUS (EWD414U)
1. INPUT SIGNALS
(1) Speed sensor signal
The speed of the wheels is detected and input to TERMINALS FL+, FR+, RL+ and RR+ of the brake ECU.
(2) Stop light SW signal
A signal is input to TERMINAL STP of the brake ECU when the brake pedal is depressed.
2. ABS SYSTEM OPERATION
During sudden braking the brake ECU has signals input from each sensor, which controls the current to the solenoid inside
the actuator and lets the hydraulic pressure acting on each wheel cylinder escape to the reservoir. The pump inside the
actuator is also operating at this time and it returns the brake fluid from the reservoir to the master cylinder, thus preventing
locking of the vehicle wheels.
If the brake ECU judges that the hydraulic pressure acting on the wheel cylinder is insufficient, the current on the solenoid is
controlled and the hydraulic pressure is increased. Holding of the hydraulic pressure is also controlled by the brake ECU, by
the same method as above. Pressure reduction, holding and increase are repeated to maintain vehicle stability and to
improve steerability during sudden braking.
A4, A5 ABS SPEED SENSOR FRONT LH, RH
2±1 :1.4±1.8 kW (20°C, 68°F)
A23, A24 ABS SPEED SENSOR REAR LH, RH
2±1 :1.04±1.3 kW (20°C, 68°F)
B10 (A), B11 (B), B12 (C), B13 (D) BRAKE ECU
(B) 6, (C) 1±GROUND : Approx. 12 volts with the ignition SW at ON position
(D) 22±GROUND : Always approx. 12 volts
(A) 6, (A)31±GROUND : Always continuity
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A434C10A36J1037
A534C11B36J1137
A736D236J1237
A2338E636J14A37
A2438E1036J15B37
B1A34F12C34J1637
B2B34F13D34J1737
B3C34F1838J18A37
B434G137J19B37
B8A36H5A34J2237
B10A36H6B34J2637
B11B36H1538P237
B12C36I1537S337
B13D36J137
B1436J737
: RELAY BLOCKS
CodeSee PageRelay Blocks (Relay Block Location)
223Engine Room R/B No.2 (Right Side of Reserve Tank)
324Engine Room R/B No.3 (Engine Compartment Right)
SYSTEM OUTLINE
SERVICE HINTS