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05–1704
DIAGNOSTICS
–
LIGHTING SYSTEM
05HJH–01
DRL RELAY CIRCUIT
CIRCUIT DESCRIPTION
The multiplex network body ECU controls the DRL No.4 relay. The DRL No.4 relay connects the daytime
running light relay and the headlamp during DRL operation. The daytime running light relay controls the illu-
minance of the headlamp accordingly.
WIRING DIAGRAM
D2 Daytime Running Light Relay
Body ECU
3
SB (*1)
IG
B6
PWMI
12
J/B No.8
9
2
2
1
Y
Y
Y
DRL
/DIM
IJ3
4I
4F
B7
2
8
3
20
G (*1)
G
G
HRLY
IJ3
4I
4F
B7
P (*1)
J19
J/C
Engine Room R/B and J/B
12
W
W
HON
DRL
B6
E
E
B (*1)
3
3
2
1
3
11
IA3
W (*1)
H–LP Relay
W
3
1
2
3
3
B
5
3
Engine Room No.2 R/B
DIM Relay
B
DRL No.4 Relay
3
3
1
2
2
2
1
2
W
3
3
BR (*1, *4)
5
3
2
2
4
L (*4)
3
5
3
W–B
(*1, *4)
15A H–LP LO RH (*3)
10A H–LP LO RH (*4)
L (*4)
3
3
1
2
15A H–LP LO LH (*3)
10A H–LP LO LH (*4)
L (*4)
3
1
2
H–LP HI RH
V (*4)
3
3
1
2
H–LP HI LH
V (*4)
3
W
1
2
1
2
3
4
5
6
7
I39985
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1868
751527027.040.png
05–1705
DIAGNOSTICS
–
LIGHTING SYSTEM
1
2
34 56
7
H7
Headlamp LH
W–B
(*1, *4)
J11
J/C
A
9
V (*4)
L (*4)
BR (*1)
BR (*1)
BR (*1, *4)
DRL
2
IA1
A
A
1
1
3
A
W–B
(*2, *4)
2
W–B (*1)
W–B (*1)
W–B
E
IA1
2
H8
Headlamp RH
V (*4)
L (*4)
BR (*1, *4)
2
1
3
W–B (*2, *4)
W
Center Connector No.2
Driver Side J/B
J19
J/C
ECU–B
10
1
7
5A
5
Y
Y
Y
+B
5K
1K
1B
D
D
3
Engine Room J/B
Converter
3
C5
1
1
1
W
W
S
AMD
C6
3E
3D
HEAD MAIN
1
3
B
3M
3B
2
1
Fusible Link Block
1
BE1
1
F15
B
4
2
W
W
IN1
F16
DC/DC–S
MAIN
Battery
EB
EE
*1: w/ Daytime Running Light
*2: w/o Daytime Running Light
*3: w/ HID
*4: w/o HID
I39986
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1869
751527027.041.png
05–1706
DIAGNOSTICS
–
LIGHTING SYSTEM
INSPECTION PROCEDURE
HINT:
Check it the headlamp (low beam and high beam) is normal before performing the following procedure.
1
PERFORM ACTIVE TEST USING HAND–HELD TESTER
(a) Connect the hand–held tester to the DLC3.
(b) Push the power switch ON (IG) and press the hand–held tester main switch on.
(c) Select the item below in the ACTIVE TEST and then check that the tail relay operates.
B No.1/GW (Multiplex Network Body ECU):
Item
Test Details
Diagnostic Note
(Test Details)
Turn daytime running light relay ON/OFF
(Vehicle Condition)
Power switch ON (IG), engine is stopped and light control SW is in OFF
DRL RELAY
–
OK: Headlamp (High beam) comes on.
NG
Go to step 2
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE PAGE 05–1677 )
2
INSPECT RUNNING LIGHT RELAY ASSY
(a)
Measure the voltage according to the value(s) in the table
below.
Connector Front View:
D2
+B
IG
E
I39977
Standard:
Tester connection
Condition
Specified condition
D2–3 – D2–2
Always
10 to 14 V
D2–12 – D2–2
Engine is running and parking brake is released
10 to 14 V
NG
Go to step 4
OK
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1870
751527027.042.png 751527027.043.png 751527027.001.png 751527027.002.png 751527027.003.png 751527027.004.png 751527027.005.png 751527027.006.png 751527027.007.png 751527027.008.png 751527027.009.png 751527027.010.png 751527027.011.png 751527027.012.png 751527027.013.png 751527027.014.png 751527027.015.png
 
05–1707
DIAGNOSTICS
–
LIGHTING SYSTEM
3
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSY
(a)
Measure the voltage according to the value(s) in the table below.
Standard:
Tester connection
Condition
Specified condition
B6–12 – Body ground
Light control switch in HEAD
Below 1 V
B6–12 – Body ground
Engine is running and parking brake is released
10 to 14 V
Instrument Panel Junction Block
Connector Front View:
B6
HON
I39973
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR (BODY ECU – ENGINE ROOM R/B
AND J/B)
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE PAGE 05–1677 )
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1871
751527027.016.png 751527027.017.png 751527027.018.png 751527027.019.png 751527027.020.png 751527027.021.png 751527027.022.png
 
05–1708
DIAGNOSTICS
–
LIGHTING SYSTEM
4
CHECK HARNESS AND CONNECTOR(GROUND CIRCUIT)
(a)
Disconnect the connector from the daytime running light
relay.
Wire Harness View:
(b)
Measure the resistance according to the value(s) in the
table below.
D2
2
I39978
Standard:
Tester connection
Condition
Specified condition
D2–2 – Body ground
Always
Below 1 W
NG
REPAIR
OR
REPLACE
HARNESS
OR
CONNECTOR
OK
5
CHECK HARNESS AND CONNECTOR(POWER SOURCE CIRCUIT)
(a)
Measure the voltage according to the value(s) in the table
below.
Wire Harness View:
D2
3
I39978
Standard:
Tester connection
Condition
Specified condition
D2–3 – Body ground
Always
10 to 14 V
NG
REPAIR
OR
REPLACE
HARNESS
OR
CONNECTOR
OK
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1872
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