2001 TOYOTA PRIUS display

F12840
EMPS ECU
WL
E67
Y 3
IP1 L 11 Multiinformation Display
22
L
Instrument Panel J/B
IG1 Relay
3
51
2H GAUGE
2A5
W
FL Block No. 1
1
F11 F131
B±G
1 MAIN FL Block No. 2 F18
BatteryDC/DC
± DIAGNOSTICSELECTRIC MOTOR POWER STEERING
DI±491
2001 PRIUS (RM778U)
DTC C1556/56 P/S Warning Light Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1556/56There is a malfunction in PS warning light circuit.
Multiinformation display

EMPS ECU
WIRING DIAGRAM
DI7RB±01

F12829
ON
WL
DI±492
± DIAGNOSTICSELECTRIC MOTOR POWER STEERING
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check voltage between terminals WL of EMPS ECU connector and body ground.
PREPARATION:
Remove the EMPS ECU with connectors still connected.
CHECK:
Turn the ignition switch ON and measure the voltage between
terminals WL of EMPS ECU connector and body ground.
OK:
Voltage: 9 ± 14 V
NG Check and replace EMPS ECU.
OK
2 Check for open and short circuit in harness and connector between EMPS ECU
and multiinformation display (See page IN±41).
NG Repair or replace harness or connector.
OK
Check multiinformation display circuit
(See page BE±97).

DI±494
± DIAGNOSTICSELECTRIC MOTOR POWER STEERING
2001 PRIUS (RM778U)
DTCAlways ONMalfunction in EMPS ECU
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
Always ONThere is a malfunction in the EMPS ECU internal circuit.

Power source circuit

EMPS ECU

PS warning light circuit
INSPECTION PROCEDURE
1 Is DTC output?
Check DTC on page DI±460.
YES Repair circuit indicated by output code.
NO
2 Is normal code displayed?
YES Check and replace EMPS ECU.
NO
3 Does PS warning light goes off?
YES Check for open or short circuit in harness and
connector between ECU±IG fuse and EMPS
ECU (See page IN±41).
NO
DI7RD±01

± DIAGNOSTICSELECTRIC MOTOR POWER STEERING
DI±495
2001 PRIUS (RM778U)
4 Check battery positive voltage.
PREPARATION:
Start the engine.
CHECK:
Check the battery positive voltage.
OK:
Voltage: 9 ± 14 V
NG Check and repair charging system.
OK
5 Check operation of PS warning light.
PREPARATION:
(a) Turn the ignition switch OFF.
(b) Disconnect the connector from the EMPS ECU.
(c) Turn the ignition switch ON.
CHECK:
Check the PS warning light goes OFF.
OK Check and replace EMPS ECU.
NG
Check for short circuit in harness and connector between multiinformation display and EMPS
ECU, multiinformation display and DLC3 (See page IN±41).

F12842
EMPS ECU
Tc
E63
P±B
C CJ16
J/C
P±B 2
ID1 P±B
E EJ26
J/C
P±B 13
Tc
5
SGBR14
ID2BR
BR 14
IO1
EB DLC3 DI±496
± DIAGNOSTICSELECTRIC MOTOR POWER STEERING
2001 PRIUS (RM778U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
Connecting terminals Tc and CG of the DLC3 causes the EMPS ECU to display the DTC by flashing the PS
warning light.
WIRING DIAGRAM
DI7RE±01

DI6OZ±06
DI±508
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
2001 PRIUS (RM778U)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the table
below (Proceed to the page given for that circuit.).
DTC No.
(See Page)Detection ItemTrouble AreaSRS
Warning Light
B0100/13
(DI±510)

Short in D squib circuit
Steering wheel pad (squib)

Spiral cable

Airbag sensor assembly

Wire harness
ON
B0101/14
(DI±515)

Open in D squib circuit
Steering wheel pad (squib)

Spiral cable

Airbag sensor assembly

Wire harness
ON
B0102/11
(DI±519)

Short in D squib circuit (to ground)
Steering wheel pad (squib)

Spiral cable

Airbag sensor assembly

Wire harness
ON
B0103/12
(DI±523)

Short in D squib circuit (to B+)
Steering wheel pad (squib)

Spiral cable

Airbag sensor assembly

Wire harness
ON
B0105/53
(DI±527)
Short in P squib circuit
Front passenger airbag assembly (squib)

Airbag sensor assembly

Wire harness
ON
B0106/54
(DI±531)
Open in P squib circuit
Front passenger airbag assembly (squib)

Airbag sensor assembly

Wire harness
ON
B0107/51
(DI±534)
Short in P squib circuit (to ground)
Front passenger airbag assembly (squib)

Airbag sensor assembly

Wire harness
ON
B0108/52
(DI±537)
Short in P squib circuit (to B+)
Front passenger airbag assembly (squib)

Airbag sensor assembly

Wire harness
ON
B0110/43
(DI±540)
Short in side squib (RH) circuit
Side airbag assembly RH (squib)

Airbag sensor assembly

Wire harness
Blink
B0111/44
(DI±544)
Open in side squib (RH) circuit
Side airbag assembly RH (squib)

Airbag sensor assembly

Wire harness
Blink
B0112/41
(DI±550)
Short in side squib (RH) circuit
(to ground)
Side airbag assembly RH (squib)

Airbag sensor assembly

Wire harness
Blink
B0113/42
(DI±550)
Short in side squib (RH) circuit
(to B+)
Side airbag assembly RH (squib)

Airbag sensor assembly

Wire harness
Blink
B0115/47
(DI±553)
Short in side squib (LH) circuit
Side airbag assembly LH (squib)

Airbag sensor assembly

Wire harness
Blink
B0116/48
(DI±557)
Open in side squib (LH) circuit
Side airbag assembly LH (squib)

Airbag sensor assembly

Wire harness
Blink

DI±510
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
2001 PRIUS (RM778U)
HINT:

When the SRS warning light remains lit up and the DTC is the normal code, this means a voltage source
drops.
This malfunction is not stored in memory by the airbag sensor assembly and if the power source volt-
age returns to normal, the SRS warning light will automatically go out.

When 2 or more codes are indicated, the codes will be displayed in numeral order starting from the
lowest numbered code.

If a code not listed on the chart is displayed, the airbag sensor assembly is faulty.

AB0119H01298H01299
(±) (+)ONAirbag Sensor Assembly
IG1
IG2
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±597
2001 PRIUS (RM778U)
DTC B1100/31 Airbag Sensor Assembly Malfunction
CIRCUIT DESCRIPTION
The airbag sensor assembly consists of a airbag sensor, safing sensor, drive circuit, diagnosis circuit and
ignition control, etc.
It receives signals from the airbag sensor, judges whether or not the SRS must be activated, and detects
diagnosis system malfunction.
DTC B1100/31 is recorded when occurrence of a malfunction in the airbag sensor assembly is detected.
DTC No.DTC Detecting ConditionTrouble Area
B1100/31
Airbag sensor assembly malfunction
Airbag sensor assembly
INSPECTION PROCEDURE
HINT:
When a malfunction code other than code B1100/31 is displayed at the same time, first repair the malfunction
indicated by the malfunction code other than code B1100/31.
1 Prepare for inspection (See step 1 on page DI±629).
2 Check voltage at IG1 and IG2 of airbag sensor assembly.
CHECK:
(a) Turn the ignition switch to ON.
(b) Measure the voltage between body ground and each of
terminals IG1 and IG2 of the airbag sensor assembly con-
nector.
OK:
Voltage: 10 ± 14 V
NG Check that an abnormality occurs on the battery
and charging system.
OK
DI6PR±01