TOYOTA PRIUS 2001 Service Repair Manual

The radio wave bands used in radio broadcasting are as follows:
Frequency
Designation
Radio wave
Modulation method
LF: Low frequency MF: Medium Frequency HF: High Frequency VHF: Very High FrequencyAmplitude modulationFrequency modulation 30 kHz
300 kHz3 MHz 30 MHz 300 MHz
LF
MFHFVHF
AM FM
BE1UU±01
BE2818
FM (Stereo)
FM (Monaural)
AM
BE2819
Fading
Ionosphere
± BODY ELECTRICALAUDIO SYSTEM
BE±95
1762 Author: Date:
2001 PRIUS (RM778U)
AUDIO SYSTEM
DESCRIPTION
1. RADIO WAVE BAND
2. SERVICE AREA
There are great differences in the size of the service area for AM
and FM monaural. Sometimes FM stereo broadcasts cannot be
received even through AM comes in very clearly.
Not only does FM stereo have the smallest service area, but it
also picks up static and other types of interference (ºnoiseº)
easily.
3. RECEPTION PROBLEMS
Besides the problem of static, there are also the problems
called ºfadingº, ºmultipathº and ºfade outº. These problems are
caused not by electrical noise but by the nature of the radio
waves themselves.

Fading
Besides electrical interference, AM broadcasts are
also susceptible to other types of interference, es-
pecially at night. This is because AM radio waves
bounce off the ionosphere at night. These radio
waves then interfere with the signals from the same
transmitter that reach the vehicle's antenna directly.
This type of interference is called ºfadingº.

BE2820
Multipath
BE2821
Fade Out
N17398
Example :
HeadCapstan
Pinch Roller
BE4331
BE±96
± BODY ELECTRICALAUDIO SYSTEM
1763 Author: Date:
2001 PRIUS (RM778U)

Multipath
One type of interference caused by bouncing of ra-
dio waves off obstructions is called ºmultipathº. Mul-
tipath occurs when a signal from the broadcast
transmitter antenna bounces off buildings and
mountains and interferes with the signal that is re-
ceived directly.

Fade Out
Because FM radio waves are of higher frequencies
than AM radio waves, they bounce off buildings,
mountains, and other obstructions. For this reason,
FM signals often seem to gradually disappear or
fade away as the vehicle goes behind a building or
other obstructions. This is called ºfade outº.
4. Tape Player/Head Cleaning:
MAINTENANCE
(a) Raise the cassette door with your finger.
Next, using a pencil or similar object, push in the guide.
(b) Using a cleaning pen or cotton applicator soaked in clean-
er, clean the head surface, pinch rollers and capstans.
5. CD Player/Disc Cleaning:
MAINTENANCE
If the disc gets dirty, clean the disc by wiping the surface from
the center to outside in the radial directions with a soft cloth.
NOTICE:
Do not use a conventional record cleaner or anti±static pre-
servative.

BE1UV±01
I17103
Audio system normal operation
to 2. SYSTEM CHECK MODE SCREEN
to 4. DISPLAY
CHECK MODE SCREEN Diagnosis start±up. (refer to next page)
HINT:
When Diagnosis Sys-
tem mode is started,
system check is per-
formed at first and the
check result is dis-
played.
± BODY ELECTRICALAUDIO SYSTEM
BE±97
2001 PRIUS (RM778U)
TROUBLESHOOTING
1. DIAGNOSIS SYSTEM MODE (w/o Navigation system)
HINT:
Diagnosis System Mode is operated as follows.
In case of a vehicle without navigation system, there is no navigation check mode. However, other modes
except for this are same as a vehicle with navigation system.

I15593
I17110
Concealed
touch
switch
BE±98
± BODY ELECTRICALAUDIO SYSTEM
2001 PRIUS (RM778U)
(a) DIAGNOSIS START±UP
To start the diagnosis menu, there are 2 ways: using a
diagnosis check wire and using a switch.
(b) START±UP BY SWITCH OPERATION
(1) Vehicle speed is 0 km/h (0 mph).
(2) Parking brake switch is pressed.
(3) Press the Display switch to display the Screen Ad-
justment screen.
(4) Repeatedly touch the upper and lower bottom parts
of the left end of the screen 3 times.
(c) FINISHING DIAGNOSIS SYSTEM MODE
Turn the ignition switch from ACC to OFF to finish the
mode. If it is started by switch operation.
2. DIAGNOSIS SYSTEM MODE (w/ Navigation system)
(See page DI±789)

BE1UT±01
I01856
Ground
Power Source
(Illumination) E
ILL
B
ACCPower Source
(System Operation)
Power Source
(Display Operation)
2
3
4Connector:
Clock Side:Wire Harness Side:
1 CLOCK WILL NOT OPERATE
I01857
B + GND
e±4±2±D e±4±1±D
Clock Side:
Wire Harness Side:
Ye s
Ye sNo
No
Is there battery positive voltage between terminal +B and body
ground.
Is there continuity between terminal GND and body ground.
Replace clock.Open or short circuit in wire harness between terminal
+B and DOME fuse.
Open or short circuit in wire harness between terminal
GND and DOME fuse.
BE±102
± BODY ELECTRICALCLOCK
1769 Author: Date:
2001 PRIUS (RM778U)
CLOCK
TROUBLESHOOTING
HINT:
Troubleshoot the clock according to the table below.
TroubleshootingNo.
Clock will not operate1
Clock loses or gains time2
± 1.5 seconds / day
1. TROUBLESHOOTING No.1
(a) Check that the battery positive voltage is 10 ± 16 V.
If voltage is not as specified, replace the battery.
(b) Check that the DOME fuse is not blown.
If the fuse is blown, replace the fuse and check for short.
(c) Troubleshoot the clock as follows.
HINT:
Inspect the connector on the wire harness side.

2 CLOCK LOSES OR GAINS TIME
I01858
Wire Harness SideClock Side
B+ GND
Ye s
Is there battery voltage between terminal +B and
body ground?
Adjust or replace clock.Bellow 10 V
Locate cause and repair, or recharge battery.
Ye s
Is there battery voltage between terminal ACC and
body ground?Bellow 10 V
Locate cause and repair, or recharge battery.
± BODY ELECTRICALCLOCK
BE±103
1770 Author: Date:
2001 PRIUS (RM778U)
2. TROUBLESHOOTING NO.2
(a) Check that the battery positive voltage is 10 ± 16 V.
If voltage is not as specified, replace the battery.
(b) Inspect the error of the clock.
Allowable error (per day): ± 1.5 seconds
If the error exceeds the allowable error, replace the clock.
(c) Check that the clock adjusting button is sticking in posi-
tion and has failed to return.
If the error exceeds the allowable error, replace the clock.
(d) Troubleshoot the clock as follows.
HINT:
Inspect the connector on the wire harness side.

BE1W9±01
BE±104
± BODY ELECTRICALHYBRID VEHICLE IMMOBILISER SYSTEM
1771 Author: Date:
2001 PRIUS (RM778U)
HYBRID VEHICLE IMMOBILISER SYSTEM
REGISTRATION PROCEDURE
1. THE COMMUNICATION BETWEEN THE HYBRID VEHICLE CONTROL ECU AND THE TRANS-
PONDER KEY ECU IS AS FOLLOWS
(a) When the ignition is turned ON, the transponder key ECU checks if the key is pre±registered or not
and sends the check result to the hybrid vehicle control ECU.
(b) When the hybrid vehicle control ECU confirms that the key is pre±registered, it transmits its own ID
(random numbers) to the transponder key ECU.
(c) Receiving the ID, the transponder key ECU calculates internally and sends the calculated result back
to the hybrid vehicle control ECU.
(d) The hybrid vehicle control ECU rechecks the calculation inside the ECU.
When the calculation result corresponds to its own ID, this enables the engine to start.
2. PREASE DO THE FOLLOWING PROCEDURES WHEN YOU EXCHANGE TRANSPONDER KEY
ECU
HINT:
When replacing the transponder key ECU or hybrid vehicle control ECU, start the engine after leaving it for
more than 30 minutes with the ignition switch ON position.
(a) (Case 1):
Replace the transponder key ECU. "Register the new transponder key codes. "Leave more than
30 minutes with the ignition switch ON. "Start the engine.
(b) (Case 2):
Replace the hybrid vehicle control ECU. "Leave more than 30 minutes with the ignition switch ON.
"Start the engine.
(c) (Case 3):
Replace the transponder key ECU and hybrid vehicle control ECU. "Register the new transponder
key codes. "Start the engine.
3. IF ALL KEYS ARE LOST, OBSERVE THE FOLLOWING
(a) Purchase a new transponder key ECU and a new key.
(b) Replace the transponder key ECU with new one.
(c) Insert a new key into the key cylinder, turn the ignition switch ON and leave it as it is for 30 min.
4. SETTING HYBRID VEHICLE IMMOBILISER SYSTEM
(a) Removing a key from the key cylinder sets hybrid vehicle immobiliser system.
(b) When 20 sec is elapsed after the key is turned from ignition switch ON to ACC or LOCK, the hybrid
vehicle immobiliser is set.
5. UNSETTING HYBRID VEHICLE IMMOBILISER SYSTEM
Insert a key into the key cylinder
(Under this condition, transponder key ECU starts communication with the transponder chip built in the key.
When the ID code in the chip coincides with that registered in ECU consecutively 2 times, the hybrid vehicle
immobiliser system is reset).

Start
Security indicator is flashing
Insert a master key (black) into the key cylinder.
Security indicator goes off for 1 sec. and then lights up.
Remove the master key.
Insert the other master key (black) into the key cylinder.
Insert the sub key (gray) into the key cylinder.
Security indicator goes off for 1 sec. and then lights up again.
Remove the sub key
Security indicator is flashing.
End Remove the master key.
Security indicator goes off for 1 sec. and then lights up.
Master key 1
Master key 2
Sub key
± BODY ELECTRICALHYBRID VEHICLE IMMOBILISER SYSTEM
BE±105
1772 Author: Date:
2001 PRIUS (RM778U)
6. KEY REGISTRATION IN AUTOMATIC REGISTRATION MODE
(a) Registration of a new transponder key.
HINT:

This must be done when you install a new transponder key ECU.

It is possible to register up to 2 master key codes and a sub key code.

In the automatic registration mode, the last key registered becomes sub±key.
(b) Initial condition: Battery connected, no key in key cylinder.

1.8 Sec.
0.2 Sec.
0.25 Sec. 0.5 Sec.0.25 Sec.
1 Sec. Blinks
Code 2±1 Code2±2
0.25 Sec.
0.25 Sec.0.5 Sec. 1 Sec. BE±106
± BODY ELECTRICALHYBRID VEHICLE IMMOBILISER SYSTEM
1773 Author: Date:
2001 PRIUS (RM778U)
HINT:

When a key is not inserted in the key cylinder on the automatic registration mode, the security indicator
always lights on.

When the immobiliser system operates normally and the key is pull out, the security indicator blinks.

When key code registration could not be performed on the automatic registration mode, code 2±1 is
output from the security indicator and when inserting the already registered key, code 2±2 is output.
(c) Automatic registration mode completion
If completing the mode forcibly when more than 1 key code have been registered on the automatic
registration mode, perform the following procedures.
After 1 more key code have been registered with master key, turn the ignition switch from LOCK to ON
5 times within 10 secs. after inserting the already registered key or without pulling the key out.

Start
Insert a master key into the key cylinder.
Repeatedly turn the key from ignition switch LOCK to ON 5 times.
Remove the master key. Repeat driver's door open/close operation 6 times.
End
Insert the key to be registered into the key cylinder.
Turn the key from ignition switch LOCK to ON and stay for 60 secs. or more.
Remove the key from the key cylinder.
Open and close a driver's door.
No Ye sWithin 15 secs.
Register next key?
Within 20 secs.
Within 10 secs.
Within 10 secs.
Within 10 secs.
*5*4 *3 *1
*2
± BODY ELECTRICALHYBRID VEHICLE IMMOBILISER SYSTEM
BE±107
1774 Author: Date:
2001 PRIUS (RM778U)
7. REGISTERING MASTER KEY
Initial condition: All doors closed, not key in cylinder.
*1: The 1 st door's open/close operation should be within 15 sec after key insertion.
*2: Remove the key within 20 sec. after the 1 st door's open/close operation.
*3: Insert the key within 10 sec. after preceding key removal.
*4: Turn the key from ignition switch LOCK to ON within 10 sec. after key insertion.
*5: If registering the other key, insert it into the key cylinder within 10 sec.