horn TOYOTA PRIUS 2001 Service Owner's Guide

H16240
Horn Button
Contact Plate
H15220
± SUPPLEMENTAL RESTRAINT SYSTEMSTEERING WHEEL PAD AND SPIRAL CABLE
RS±15
2001 PRIUS (RM778U)
3. Vehicle involved in collision and airbag is deployed:
INSPECT SUPPLEMENTAL RESTRAINT SYSTEM
(a) Do a diagnostic system check (See page DI±497).
(b) Do a visual check which includes the following items with
the steering wheel pad (with airbag) removed from the ve-
hicle.

Check the deformation on the horn button contact
plate of the steering wheel.

Check the damage on the spiral cable connector
and wire harness.
CAUTION:
For removal and installation of the steering wheel pad, see
page SR±6 and SR±14, and be sure to follow the correct
procedure.
HINT:

If the horn button contact plate of the steering wheel is de-
formed, never repair it. Always replace the steering wheel
assembly with a new one.

There should be no interference between the steering
wheel pad and steering wheel, and the clearance should
be uniform all the way around when the new steering
wheel pad is installed on the steering wheel.

± BODY ELECTRICALTROUBLESHOOTING
BE±9
1676 Author: Date:
2001 PRIUS (RM778U)
POWER DOOR LOCK CONTROL SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
All the doors cannot be locked or unlocked.
(Power Window Control System is normal.)1. Door Lock Control Switch
2. Body ECU
3. Wire HarnessBE±62
DI±678
±
Only one side door lock control does not operate.1. Door Lock Motor
2. Wire HarnessBE±62
±
Door key related function does not operate.
1. Door Key Lock and Unlock Switch
2. Body ECU
3. Wire HarnessBE±62
DI±678
±
Key confinement prevention function does not operate.
1. Key Unlock Warning Switch
2. Door Courtesy Switch
3. Body ECU
4. Wire HarnessBE±17
BE±27
DI±678
±
THEFT DETERRENT SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
HINT:
Troubleshooting of the theft deterrent system is based on the premise that the door lock control system is
operating normally. Accordingly, before troubleshooting the theft deterrent system, first make certain that
the door lock control system is operating normally.
SymptomSuspect AreaSee page
The theft deterrent system cannot be set
1. Indicator light circuit
2. ECU power source circuit
3. Key unlock warning switch circuit
4. Door key lock and unlock switch circuit
5. Door courtesy switch circuit
6. Door unlock detection switch circuit
7. Engine hood courtesy switch circuitDI±704
DI±685
DI±695
DI±724
DI±714
DI±710
DI±720
The indicator light does not blink when system is set.Indicator light circuitDI±704
When the system is set
(The system does not operate when the rear door is unlocked).Door unlock detection switch circuitDI±710
When the system is set
(The system does not operate when the luggage compartment
door is opened by a method other than the key).
Luggage compartment door courtesy switch circuitDI±722
When the system is set
(The system does not operate when the engine hood is lifted).Engine hood courtesy switch circuitDI±720
While the system is in warning operation
(Horns do not sound).Horn relay circuitDI±697
While the system is in warning operation
(Headlights do not flash).Headlight control relay circuitDI±693
While the system is in warning operation
(Taillights do not flash).Taillight control relay circuitDI±691
While the system is in warning operation
(The door lock is not locked).Door unlock detection switch circuitDI±710
System is still set even when a rear door is openDoor courtesy switch circuitDI±714
Even when the system is not set
(Horns sound).Horn relay circuitDI±697

± BODY ELECTRICALTROUBLESHOOTING
BE±11
1678 Author: Date:
2001 PRIUS (RM778U)
HORN SYSTEM
SymptomSuspect AreaSee page
Horn system does not operate.
1. HORN Fuse
2. Horn Relay
3. Horn Switch
4. Horn
5. Wire HarnessBE±12
BE±117
BE±117
BE±117
±
Horns blow all the time.
1. Horn Relay
2. Horn Switch
3. Wire HarnessBE±117
BE±117
±
One horn operates but the other horn does not operate.1. Horn
2. Wire HarnessBE±117
±
Horns operate abnormally.
1. Horn Relay
2. Horn
3. Wire HarnessBE±117
BE±117
±

I17787
Engine room J/B:
Fuses:
1. HTR Fuse
2. RDI Fuse
3. ABS No. 2 Fuse
4. CDS FAN Fuse
5. HORN Fuse
6. THRO Fuse
7. ABS No. 3 Fuse
8. TURN±HAZ Fuse
9. AM2 Fuse
10. BATT FANRelays:
A. FAN NO. 1 Relay
B. FAN NO. 2 Relay
C. FAN NO. 3 Relay
D. IG2 Relay
E. HORN Relay
F. HTR Relay
G. EFI Relay
H. CLR MG Relay
I. HEAD Relay
J. CIR OPN Relay
K. DIM Relay *1
123 4 5 6 7 8
91011
121314
1516
17
18 K
J
A B
C D E
F
G H
I
11. DOME Fuse
12. HEAD HI (RH) Fuse *1
13. HEAD HI (LH) Fuse *1
14. HEAD LO (LH) *1
HEAD (LH) *2
15. HEAD LO (RH) *1
HEAD (RH) *2
16. EFI Fuse
17. HEV Fuse
18. HEAD Fuse *1
*1: w/ Daytime Running Light
*2: w/o Daytime Running Light
± BODY ELECTRICALPOWER SOURCE
BE±13
1680 Author: Date:
2001 PRIUS (RM778U)

DI7T9±01
± BODY ELECTRICALTHEFT DETERRENT SYSTEM
BE±67
2001 PRIUS (RM778U)
PRE±CHECK
1. OUT LINE OF THEFT DETERRENT SYSTEM
When the theft deterrent system detects any theft, it informs
people around with flashing lights and sound.
This system is designed to be upgraded by featuring an option-
al glass break sensor.
All initial setting are performed in active mode. It can be
switched to passive mode by specified operation. (See step 3.
CHANGING METHOD OF PASSIVE MODE)
HINT:
There are 4 conditions in this system which are disarmed state,
arming preparation, armed state and alarm sounding.
(1) Disarmed state
When the alarming function does not oper-
ate.
When theft deterrent function is not per-
formed.
(2) Arming preparation
Time until transferring to armed state.
Theft deterrent function is not performed.
(3) Armed state
When theft deterrent function is possible.
(4) Alarm sounding:
In this condition, once theft is detected, it is in-
formed using light and sound to people around the
vehicle.
Refer to the table for alarming method or time.
Horn
Security horn
Al i th dHeadlightAlarming methodTaillight
Hazard
Interior light
Alarming time60 seconds
Alarming outputContinuous 0.4 secs. (ON)
0.4 secs. (OFF)
HINT:
Alarming output for hazard is same as the one for the hazard
on the vehicle.
In the arming condition when either of doors is unlocked with
key not in the key cylinder, force lock signal is output.

Disarmed state
Perform any of the following and the system will go no to ºArming preparationº:

With all the doors, engine hood and luggage compartment door closed, lock all doors with the key.

With all the doors, engine hood and luggage compartment door closed, lock all doors with the
wireless remote.

With all the doors, engine hood and luggage compartment door closed, open and close any of doors,
engine hood or luggage compartment door, then close and lock all doors, engine hood and luggage
compartment door.
Arming preparation
Perform the following and the system will
go on to ºArmed stateº:

Let 30 seconds elapse with all the doors,
engine hood and luggage compartment door
closed and locked.
Perform any of the following and the system
will return to ºDisarmed stateº:

Open any of the doors, engine hood or luggage
compartment door.

Unlock any of the doors.

Put the key in the ignition.

Reconnect the battery.
Armed state
Perform any of the following and the system
will return to ºDisarmed stateº:

Unlock any of the doors or open the luggage
compartment door with the wireless remote.

Unlock the doors with the wireless remote.

Put the key in the ignition and turn it to ON.
Perform any of the following and the system
will go on to ºAlarm soundingº:

Open any of the doors.

Unlock any of the doors in any way other than
with a key or the wireless remote.

Open the luggage compartment door in any way
other than with a key.

Open the engine hood.

Reconnect the battery.

When input from optional glass break sensor is
detected (Dealer option)(Key not inserted in ignition.)
Alarm sounding
The vehicle's horn and security horn will sound,
and the hazard, interior, tail and head lights flash
for 60 seconds.
After the alarm has ended, the system will
return to ºArmed stateº. Perform any of the following and the system
will return to ºDisarmed stateº:

Unlock any of the doors or open the luggage
compartment door with the wireless remote.

Unlock the doors with the wireless remote.

Put the key in the ignition and turn it to ON.
BE±68
± BODY ELECTRICALTHEFT DETERRENT SYSTEM
2001 PRIUS (RM778U)
2. ACTIVE ARMING MODE

BE0FZ±14
I17863
I11734
BE3907
± BODY ELECTRICALHORN SYSTEM
BE±117
2001 PRIUS (RM778U)
INSPECTION
1. INSPECT HORN SWITCH
(a) Disconnect the negative (±) terminal from the battery.
(b) Remove the left and right covers from the steering wheel.
(c) Using a torx socket wrench, loosen the 2 bolts.
(d) Pull up the horn pad and place it on the steering column,
as shown.
HINT:
Do not disconnect the connector from the horn pad.
(e) Disconnect the connector from the slip ring.
(f) Check that no continuity exists between terminal 6 of the
connector and body ground.
(g) Check that continuity exists between terminal 6 of the
connector and body ground when the horn contact plate
is pressed against the steering spoke assembly.
If continuity is not as specified, repair or replace the steering
wheel or wire harness as necessary.
(h) Install the horn pad in place and using a torx socket
wrench, torque the 2 bolts.
Torque:
7.1 N´m (72 kgf´cm, 62 in.´lbf)
(i) Install the left and right covers.
(j) Connect the negative (±) terminal to the battery.
2. INSPECT HORN OPERATION
Connect the positive (+) lead from the battery to the terminal
and negative (±) lead to the horn body and check that the horn
blows.
If operation is not as specified, replace the horn.

I01200
2 1
35
2 5
1 3
BE±118
± BODY ELECTRICALHORN SYSTEM
2001 PRIUS (RM778U)
3. INSPECT HORN RELAY CONTINUITY
ConditionTester connectionSpecified condition
Constant1 ± 2Continuity
Apply B+ between
terminals 1 and 2.3 ± 5Continuity
If continuity is not as specified, replace the relay.