cic12414.pdf

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05–1019
DIAGNOSTICS
–
ELECTRONICALLY CONTOROLLED BRAKE SYSTEM
05IZH–01
DTC
C1241/41
LOW BATTERY POSITIVE VOLTAGE OR
ABNORMALLY HIGH BATTERY POSITIVE
VOLTAGE
DTC
C1242/42
IG2 POWER SOURCE CIRCUIT
CIRCUIT DESCRIPTION
These codes are memorized when the power source voltage for the skid control ECU drops or the voltage
for the ABS No.1, ABS No.2 relay operation drops.
Codes may be memorized when the voltage of the auxiliary battery temporarily drops.
When the power source voltage is too high, the skid control ECU stops functioning and outputs no DTCs,
and the ABS and BRAKE warning light remain on.
HINT:
DTC C1256/56 (accumulator low voltage malfunction) may be memorized if the power source voltage drops.
DTC No.
Detailed Code
DTC Condition
Trouble Area
System 1 is under the following
conditions when READY is on:
Linear solenoid cannot receive
enough current (brake is ap-
plied).
ABS No.1 relay
BS voltage is less than 8.9 V for
at least 3 sec. (brake is not ap-
plied).
Harness and connector
Skid control power supply circuit
C1241/41
81
Brake control power supply assy
12 V–power source voltage in-
side ECU is less than 8.5 V when
main relay is opened or VCM
voltage is less than 4.7 V or 5 V
or more for at least 0.05 sec.
Hybrid control system
System 2 is under the following
conditions when READY is on:
Linear solenoid cannot receive
enough current (brake is ap-
plied).
BS voltage is less than 8.9 V for
at least 3 sec. (brake is not ap-
plied).
12 V–power source voltage in-
side ECU is less than 8.5 V when
main relay is opened or VCM
voltage is less than 4.7 V or 5.3
V or more for at least 0.05 sec.
ABS No.2 relay
Harness and connector
C1241/41
82
Skid control power supply circuit
Brake control power supply assy
Hybrid control system
Capacitor mode signal is received
from brake control power supply
for 3 sec. or more when READY is
on.
Brake control power supply assy
Brake control power supply
Hybrid control system
C1241/41
83
ABS is requested to operate when
the power source voltage of the
main relay system is dropping.
ABS No.1 relay
C1241/41
84
ABS No.2 relay
Harness and connector
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1183
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05–1020
DIAGNOSTICS
–
ELECTRONICALLY CONTOROLLED BRAKE SYSTEM
DTC No.
Detailed Code
DTC Condition
Trouble Area
ABS No.1 relay
Harness and connector
Skid control power supply circuit
Brake control power supply assy
Hybrid control system
Voltage is applied to IG2 terminal,
but not applied to IG1 terminal for
at least 4 sec.
C1242/42
87
ABS No.2 relay
Harness and connector
Skid control power supply circuit
Brake control power supply assy
Hybrid control system
Voltage is applied to IG 1 terminal,
but not applied to IG 2 terminal for
at least 4 sec.
C1242/42
88
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1184
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05–1021
DIAGNOSTICS
–
ELECTRONICALLY CONTOROLLED BRAKE SYSTEM
WIRING DIAGRAM
Skid Control ECU
A2 Brake Actuator
4
Y
S7
3
S10
7
S10
17
S10
SMC1
SMC1
20
LG
SMC2
SMC2
6
J/C
F
D
P
J8
J7
BS2
Y
P
R2+
Engine Room R/B
ABS No.2 Relay
B
B
BS1
15
S10
B
B
19
V
3
3
SR2
B
B
1
2
W
3
3
3
5
Short Connector
ABS No.1 Relay
1
1
P
S2
S3
3
3
3
5
2
2
12
L
S2
S3
3
3
S7
SR1
1
2
2
B17 Brake Master
Stroke Simulator
Cylinder Assembly
P
R1+
S7
3
B
BS1
S7
BR
BDSS
13
2
BR
SCSS
S7
P
BSR
1
3
B
S8
+BI1
5
R
S9
+BI2
B18
Brake Control Power Supply
J6
J/C
C
6
4
L
W
W
W
BC
IN1
S9
+BO2
OUT2
7
C
8
C
J/C
C
7
A
Y
B
IG
Y
J8
J7
IN1
OUT
5
1
C
5
V
+BO1
BCTY
J7
S8
10
8
5
V
V
IK1
+BCTY
BCTY
S7
2
J4 J/C
7
B
B
S8
IG1
B
B
1 2 3 4 5
6
F47296
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1185
751526028.016.png
05–1022
DIAGNOSTICS
–
ELECTRONICALLY CONTOROLLED BRAKE SYSTEM
1 2 3 4 5
6
Driver Side J/B
6
21
2
V
V
IM1
1F
1D
24
Center Connector No.2
1A
ECU–IG
7
8
15
7
O
B
B
IM1
5I
5H
1L
IG1 Relay
1
1B
5
3
Center Connector No.1
7
7
3
17
B
W–B
4J
4G
1J
1E
2
1
8
AM1
8
1
R
4J
4G
1J
1
1
V
4J
4I
Engine Room R/B and J/B
1
3
5
IA3
W
IG2 Relay
4J
4I
2
3
V
3I
3I
P6 Power Source
Control ECU
4
IA1
1
4
W
W
W
3I
3I
AM2
12
V
IG2D
1
AM2
35
W
3K
R
2
1
AM1
P/I
33
1
3A
B
IG1D
1
2
34
DC/DC
1
3D
1
2
5
ABS MAIN 3
L
L
IN1
3
1
2
ABS MAIN 2
R
3
1
2
ABS MAIN 1
1
B
3
3M
1
2
B
W–B
W–B
V
1 2 3 4
5
F47297
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1186
751526028.017.png
05–1023
DIAGNOSTICS
–
ELECTRONICALLY CONTOROLLED BRAKE SYSTEM
1 2 3 4
5
J2
J/C
Center Connector No.1
6
6
1
B
W
W
4G
4I
IA1
A
A
Driver Side J/B
4
IGN
5
9
B
O
1J
1A
S10
IG2
1
V
W
S7
GND1
W–B
2
W–B
W–B
W
S8
GND2
1
1
B
B
W
BE1
S8
GND3
2
F15
FL Block
W–B
S9
GND4
1
W–B
W–B
S9
GND5
1
MAIN
4
W–B
S10
GND6
W–B
GND1
31
W–B
GND2
32
D7
Door
Courtesy
SW
Front LH
1
Auxiliary
Battery
EF
IH
EF
EE
F47298
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1187
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