2001 TOYOTA PRIUS Service Repair Manual

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).