cilt68.pdf

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05–1714
DIAGNOSTICS
–
LIGHTING SYSTEM
05HJJ–01
LIGHT CONTROL SWITCH CIRCUIT
CIRCUIT DESCRIPTION
This circuit detects the state of the headlamp dimmer switch.
WIRING DIAGRAM
Body ECU
Center Connector
(Driver Side)
Driver Side J/B
10
10
4
1I
R
P
4B
4F
HU
8
2
7
18
B5
G (*1)
W (*1)
4B
4F
AUTO
3
8
21
R
R
4B
4F
B7
TAIL
1
14
3
Y
B
4B
4F
B7
HEAD
4
22
9
G
V
4B
4F
B7
HF
12
14
13
SB
SB
4B
4F
B5
LIB1
C10
Combination Switch
11
19
18
20
17
4
HU EL
A
T
H
HL HF BFG LFG
OFF
Tail
Head
AUTO
Low
High
Flash
Off
Light
Control
Switch
Dimmer
Switch
Fog
Switch
On
12
16
3
O
Center–Connector
(Driver’s Side)
5
15
L
4B
4B
9
14
G
4B
4G
Driver Side J/B
17
BR
28
W–B
IH
1E
1E
2004 Prius – Preliminary Release (RM1075U)
I39988
Author:
Date:
1878
751527182.036.png
05–1715
DIAGNOSTICS
–
LIGHTING SYSTEM
INSPECTION PROCEDURE
1
READ VALUE OF 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 items below in the DATA LIST, and read the displays on the hand–held tester.
B No.1/GW (Multiplex Network Body ECU):
Measurement Item/
Display (Range)
Diagnostic
Note
Item
Normal Condition
Headlight dimmer SW
signal/ON or OFF
ON: Headlamp dimmer switch is in HI or FLASH position
OFF: Headlamp dimmer switch is in LO position
DIMMER SW
–
HIGH
FLASHER SW
Headlight dimmer SW
signal/ON or OFF
ON: Headlamp dimmer switch is in FLASH position
OFF: Headlamp dimmer switch is in except FLASH position
–
AUTO LIGHT
SW
Auto light SW signal/
ON or OFF
ON: Light control switch is in AUTO position
OFF: Light control switch is in except AUTO position
–
HEAD LIGHT
SW
Head light control SW
signal/ON or OFF
ON: Light control switch is in HEAD position
OFF: Light control switch is in except HEAD position
–
TAIL LIGHT
SW
Taillight SW signal/
ON or OFF
ON: Light control switch is in TAIL or HEAD position
–
NG
Go to step 2
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE PAGE 05–1677 )
2
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSY
(a)
Disconnect the B5, B7 and 1I connectors from the instrument panel junction block assy.
(b)
Measure the resistance according to the value(s) in the table below.
Standard:
Tester connection
Condition
Specified condition
1I–4 – Body ground
Headlamp dimmer switch LOW " HIGH
10 k W or higher " Below 1 W
B5–18 – Body ground
Light control switch OFF
"
AUTO
10 k
W
or higher
"
Below 1
W
B7–3 – Body ground
Light control switch OFF " HEAD
10 k W or higher " Below 1 W
B7–21 – Body ground
Light control switch OFF
"
TAIL
10 k
W
or higher
"
Below 1
W
B7–22 – Body ground
Headlamp dimmer switch LOW " FLASH
10 k W or higher " Below 1 W
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1879
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05–1716
DIAGNOSTICS
–
LIGHTING SYSTEM
Instrument Panel Junction Block
Connector Front View:
Front Side:
1I
HU
Rear Side:
B5
B7
TAIL
HF
AUTO
HEAD
I41126
NG
Go to step 3
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE PAGE 05–1677 )
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1880
751527182.018.png 751527182.019.png 751527182.020.png 751527182.021.png
05–1717
DIAGNOSTICS
–
LIGHTING SYSTEM
3
INSPECT HEADLAMP DIMMER SWITCH ASSY
(a)
Inspect light control switch continuity.
(1) Measure the resistance according to the value(s) in
the table below.
Standard:
Tester connection
Connector Front View:
C10
Condition
Specified condition
12 – 18
12 – 19
12 – 20
OFF
10 k
or higher
W
12 – 18
TAIL
Below 1 W
E68152
12 – 18
12 – 20
HEAD
Below 1
W
12 – 19
AUTO
Below 1 W
(b)
Inspect headlamp dimmer switch continuity.
(1) Measure the resistance according to the value(s) in
the table below.
Standard:
Tester connection
Condition
Specified condition
11 – 12
12 – 17
FLASH
Below 1 W
12 – 16
LOW BEAM
Below 1 W
11 – 12
HIGH BEAM
Below 1 W
NG
REPLACE HEADLAMP DIMMER SWITCH ASSY
(SEE PAGE 65–23 )
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1881
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