2001 TOYOTA PRIUS Service Repair Manual

I17798
A20
A12
A14
A2
A3
A1
B7
B6
B1
A9
A11
A13
A22
A21
B2
B3Conversion
Drive unit
Correspon
dence
Buzzer
Power Supply
Circuit (VFD)
ECU
Drive unit
Open door indicator
Illumination
Brake warning
Driver seat belt warning
Low oil pressure warning
Discharge warning
CRUISE main indicator
Engine coolant warning (Low)
Engine coolant warning (High)
Passenger seat belt warning
Malfunction indicator
ABS warning
SRS warning
Left turn indicator
Right turn indicator
Hi±beam indicator B5
A19
A18
A17A15 A16 A10 B4 Output control indicator BE±40
± BODY ELECTRICALCOMBINATION METER
2001 PRIUS (RM778U)

No. Wiring connector side
1
2
3
10
11
12
13
14
15
16
17
18
19
20
21
22EMPS ECU
Fuel tank temperature (+)
Hybrid vehicle control ECU (4P)
Ground
Ground
Center airbag sensor assembly
Headlight dimmer switch
Turn signal switch (Right)
Turn signal switch (Left)
Fuel tank temperature (±)
DOME Fuse
GAUGE FuseODO/TRIP switch (TC)
ODO/TRIP switch (E)
ODO/TRIP switch (ODO)
9 ABS ECU (SI)
ABS ECU (ABS)
2
3
4
5
6
7 1 Back±up light relay
Body ECU
Engine ECM
ACC Fuse
Light control rheostat (TC)
Light control rheostat (TR) A
BBody ECU
± BODY ELECTRICALCOMBINATION METER
BE±41
2001 PRIUS (RM778U)

BE1VU±02
I17803
Connector ºAº Connector ºBº BE±42
± BODY ELECTRICALCOMBINATION METER
2001 PRIUS (RM778U)
INSPECTION
1. INSPECT COMBINATION METER CIRCUIT
Disconnect connector ºAº and ºBº from the combination meter
and inspect the connectors on the wire harness side as shown
in the table.
Tester connectionConditionSpecified condition
A1 ± Ground
(ILL ± Body ground)Ignition switch ON and tail cancel switch ON or
OFFBelow 1V or 4.5 ± 5.5 V
A2 ± Ground
(E ± Body ground)ConstantContinuity
A3 ± Ground
(OPO ± Body ground)Ignition switch ON and trip reset switch ON or
OFFBelow 1V or 4.5 ± 5.5 V
A9 ± Ground
(SI ± Body ground)Ignition switch ON and slowly turn drive wheelBelow 1V or 10 ± 14 V
A10 ± Ground
(LP ± Body ground)Ignition switch ON and ABS indicator ON or OFFBelow 1V or 10 ± 14 V
A11 ± Ground
(L ± Body ground)Ignition switch ONPulse generation
A13 ± GroundI iti it h ON d l l t d i h lBelow 1V or 10 ± 14 VA13 Ground
(+S ± Body ground)Ignition switch ON and slowly turn drive wheelBelow 1V or 4.5 ± 5.5 V
A14 ± Ground
(ES ± Body ground)ConstantContinuity
A15 ± Ground
(EP ± Body ground)ConstantContinuity
A16 ± Ground
(SW ± Body ground)Ignition switch ON and air bag indicator light ON
or OFFBelow 1V or 10 ± 14 V
A17 ± Ground
(S ± Body ground)Headlight dimmer switch Hi or LowBelow 1V or 10 ± 14 V
A18 ± Ground
(B ± Body ground)Ignition switch ON and turn signal switch rightBelow 1V or 10 ± 14 V
A19 ± Ground
(B ± Body ground)Ignition switch ON and turn signal switch leftBelow 1V or 10 ± 14 V
A21 ± Ground
(B ± Body ground)Constant10 ± 14 V

I18205
I18205
± BODY ELECTRICALCOMBINATION METER
BE±43
2001 PRIUS (RM778U) A22 ± Ground
(IG ± Body ground)
Ignition switch OFF or ONBelow 1V or 10 ± 14 V
B1 ± Ground
(ROUT ± Body ground)Ignition switch ON and shift lever position is ºRº
or except ºRºBelow 1V or 10 ± 14 V
B2 ± Ground
(MPX+ ± Body ground)Ignition switch ONPulse generation
B3 ± Ground
(MPX ± Body ground)Ignition switch ONPulse generation
B5 ± Ground
(ACC ± Body ground)Ignition switch ACC10 ± 14 V
2. INSPECT SPEEDOMETER ON±VEHICLE
Using a speedometer tester, inspect the speedometer for allow-
able indication error and check the operation of the odometer.
HINT:
Tire wear and tire over or under inflation will increase the indica-
tion error.
If error is excessive, replace the speedometer.
(mph)(km/h)
Standard indication Allowable rangeStandard indication Allowable range
20 18± 22 20 18 ± 22
40 38 ± 42 40 38 ± 42
60 59 ± 63 60 58 ± 62
80 79 ± 83 80 78 ± 82
100 99 ± 104 100 97 ± 103
120 119 ± 125 120 117 ± 123
140 137 ± 143
160 157 ± 163
3. INSPECT INPUT SPEED SIGNAL
While driving the vehicle at 10 km/h, measure the voltage be-
tween connector terminals A9 and A14 of the combination me-
ter.
Standard: Change between Hi and LO is repeated 7
time for 1 second.
HINT:
Check it the ignition switch ON and the connector connected.
4. INSPECT OUTPUT SPEED SIGNAL
While driving the vehicle at 10 km/h, measure the voltage be-
tween connector terminal A13 and A14 of the combination me-
ter.
Standard: Change between Hi and LO is repeated 7
time for 1 second.
HINT:
Check it the ignition switch ON and the connector connected.