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05–1804
DIAGNOSTICS
–
AUDIO SYSTEM
05HGY–01
ILLUMINATION CIRCUIT
CIRCUIT DESCRIPTION
When the light control switch is turned to TAIL or HEAD position, the T–LP relay activates and power is sup-
plied to the radio receiver assy and the multi–display panel illumination. The body ECU determines the sur-
rounding illumination intensity according to the illumination intensity detected by the automatic light control
sensor and activates the T–LP relay, allowing power to be supplied to the radio receiver assy and the multi–
display panel illumination.
Illumination intensity adjustment for the radio receiver assy and multi–display panel illumination is performed
with the rheostat switch.
HINT:
If a problem exists in the automatic light control sensor, DTC B1244 is output.
WIRING DIAGRAM
Radio Receiver Assy
Driver Side J/B
J19
J/C
T–LP Relay
PANEL
8
2
10
1
G
G
W
R6
ILL+
1M
R3
1B
C
C
(*1) (*2)
C
To Body ECU
From Power Source
Control ECU
G
R7
Rheostat Switch
Center Connector No.2
15
5
4
12
6
R
W–B
R6
R4
ILL–
ILL–
5M
5E
(*1) (*2)
14
5E
Multi–display
5
5
5
W–B
W–B
5M
5L
E
1
M13
ILL+
Engine Room R/B and J/B
2
DC/DC
1
1
W–B
B
M13
ILL–
3D
3M
1
2
A
F15
FL Block
J25
J/C
1
A
MAIN
B
BE1
1
W–B
Battery
IH
*1: Separate Type Amplifier
*2: Built–in Type Amplifier
I39332
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1968
751531657.048.png
05–1805
DIAGNOSTICS
–
AUDIO SYSTEM
INSPECTION PROCEDURE
1
CHECK CONDITION
(a)
Check all components with illumination malfunctions.
Components with malfunction
Go to step
Radio receiver assy or/and multi–display
A
All illumination (Radio receiver assy, multi–display combination meter and
hazard warning switch)
B
HINT:
If all the illuminations have malfunctions, check the rheostat switch.
B
GO TO COMBINATION METER SYSTEM
(SEE PAGE 05–1983 )
A
2
CHECK HARNESS AND CONNECTOR (COMPONENTS WITH MALFUNCTION –
BATTERY)
(a)
RADIO RECEIVER ASSY
(1) Disconnect the radio receiver assy R6 or R3 con-
nector.
(2) Measure the voltage according to the values in the
table below.
Standard:
Tester connection
Separate Type Amplifier
Wire Harness View:
R6
Condition
Specified condition
ILL+ (R6–2) – Body
ground *1
Light control switch TAIL
or HEAD
10 to 14 V
ILL+
ILL+ (R3–10) – Body
ground *2
Light control switch TAIL
or HEAD
10 to 14 V
Built–in Type Amplifier
Wire Harness View:
*1: Separate Type Amplifier
*2: Built–in Type Amplifier
R3
ILL+
I36933
I36949
I38420
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1969
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05–1806
DIAGNOSTICS
–
AUDIO SYSTEM
(b)
MULTI–DISPLAY
(1) Disconnect the multi–display M13 connector.
(2) Measure the voltage according to the values in the
table below.
Standard:
Tester connection
Multi–display Wire Harness View:
M13
Condition
Specified condition
ILL+ (M13–1) –
Body ground
Light control switch TAIL
or HEAD
ILL+
10 to 14 V
NG
REPAIR
OR
REPLACE
HARNESS
OR
I39881
CONNECTOR
OK
3
CHECK HARNESS AND CONNECTOR (COMPONENTS WITH MALFUNCTION –
RHEOSAT SWITCH)
(a)
RADIO RECEIVER ASSY
(1) Disconnect the radio receiver assy R4 or R6 con-
nector and rheostat switch R7 connector.
(2) Measure the resistance according to the values in
the table below.
Standard:
Tester connection
Separate Type Amplifier
Wire Harness View:
R6
Condition
Specified condition
ILL– (R6–12) – ILL–
(R7–6) *1
ILL–
Always
Below 1 W
ILL– (R4–5) – ILL– (R7–6)
*2
Always
Below 1 W
Built–in Type Amplifier
Wire Harness View:
*1: Separate Type Amplifier
*2: Built–in Type Amplifier
R4
ILL–
I36933
I36950
I40257
Light Control Rheostat Wire
Harness View:
R7
I40235
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1970
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05–1807
DIAGNOSTICS
–
AUDIO SYSTEM
(b)
MULTI–DISPLAY
(1) Disconnect the rheostat switch R7 connector.
(2) Measure the resistance according to the values in
the table below.
Standard:
Tester connection
Multi–display Wire Harness View:
M13
Condition
Specified condition
ILL– (M13–2) – ILL–
(R7–6)
Always
Below 1 W
ILL–
I39881
Light Control Rheostat Wire
Harness View:
R7
NG
REPAIR
OR
REPLACE
HARNESS
OR
CONNECTOR
I40235
OK
4
CHECK HARNESS AND CONNECTOR (RHEOSTAT SWITCH – BODY GROUND)
(a)
Measure the resistance according to the values in the
table below.
Standard:
Tester connection
Light Control Rheostat Wire
Harness View:
R7
Condition
Specified condition
E (R7–5) – Body ground
Always
Below 1
W
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR (RHEOSTAT SWITCH – BODY
GROUND)
E
I40235
OK
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1971
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05–1808
DIAGNOSTICS
–
AUDIO SYSTEM
5
INSPECT LIGHT CONTROL RHEOSTAT
(a)
Reconnect the connectors.
Light Control Rheostat
Connector Front View:
(b)
Measure the voltage according to the values in the table
below.
Standard:
Tester connection
R7
Condition
Specified condition
Light control rheostat is
turned volume up
ILL– (R7–6) – Body
ground
Pulse generation
(see waveform 1)
vol-
"
ume down
ILL–
HINT:
Waveform 1: Inspection using oscilloscope.
Standard:
Item
I40070
A
Condition
Tool setting
2 V/DIV, 1 ms/DID
Vehicle condition
Light control switch TAIL or HEAD
HINT:
Duty ratio changes as illumination becomes darker (”A” be-
comes longer).
GND
NG
REPLACE LIGHT CONTROL RHEOSTAT
I37750
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE PAGE 05–1778 )
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1972
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