Toyota Sequoia (2005). Manual — part 553
I28576
270
°
Bright
0
°
Dark
R6
ILL–
I28577
Light Control Rheostat
Wire Harness View:
R6
E
–
DIAGNOSTICS
AUDIO SYSTEM
DI–2007
2201
8
Check light control rheostat.
PREPARATION:
(a)
Reconnect the light control rheostat switch connector.
(b)
Ignition switch is ON.
(c)
Light control switch is TAIL or HEAD.
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Symbol
(Tester connection)
Condition
Specified condition
ILL– (R6–6) –
Body ground
Rheostat knob to fully
counterclockwise
→
fully clockwise
Below 1 V
→
10 to 14 V
NG
Replace light control rheostat.
OK
9
Check harness and connector (Light control rheostat – Body ground).
PREPARATION:
Disconnect the light control rheostat connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol (Tester connection)
Specified condition
E (R6–5) – Body ground
Below 1
Ω
NG
Repair or replace harness or connector.
OK
Repair or replace wire harness or connector (Battery – spiral cable sub–assy).
I28378
Radio Receiver Assy
R–W
1
7
R4
MUTE
S10
Stereo Component Amplifier
MUTE
DI–2008
–
DIAGNOSTICS
AUDIO SYSTEM
2202
Mute signal circuit
CIRCUIT DESCRIPTION
This circuit sends a signal to the stereo component amplifier to mute noise. Because of that, the noise pro-
duced by changing the sound source ceases.
If there is an open in the circuit, noise can be heard from the speakers when changing the sound source.
If there is a short in the circuit, even though the stereo component amplifier assy is normal, no sound or only
an extremely small sound can be produced.
WIRING DIAGRAM
DID9Y–01
I28755
Stereo Component Amplifier Assy:
MUTE
S10
I28606
Radio Receiver Assy
Wire Harness View:
MUTE
R4
I28752
Stereo Component Amplifier Assy:
MUTE
S10
–
DIAGNOSTICS
AUDIO SYSTEM
DI–2009
2203
INSPECTION PROCEDURE
1
Inspect stereo component amplifier assy.
PREPARATION:
Make sure that the stereo component amplifier assy connector
is connected.
CHECK:
Measure the voltage according to the value in the table below.
OK:
Symbol
(Tester connection)
Condition
Specification
MUTE (S10–1) –
Body ground
Turn ignition switch to
ACC, Audio system is
playing
→
Changing mode
Above 3.5 V
→
Below 1 V
OK
Proceed to next circuit inspection shown in
problem symptoms table (See page
NG
2
Check harness and connector (Radio receiver assy – Stereo component amplifi-
er assy).
PREPARATION:
Disconnect the radio receiver assy and stereo component am-
plifier assy connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol
(Tester connection)
Condition
Specified condition
MUTE (R4–7) –
MUTE (S10–1)
Always
Below 1
Ω
MUTE (R4–7) –
Body ground
Always
10 k
Ω
or higher
NG
Repair or replace harness or connector.
I28738
R4
Wire Harness View:
MUTE
DI–2010
–
DIAGNOSTICS
AUDIO SYSTEM
2204
OK
3
Inspect radio receiver assy.
PREPARATION:
Reconnect the radio receiver assy connector.
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Symbol
(Tester connection)
Condition
Specified condition
MUTE (R4–7) –
Body ground
Ignition switch ON
Above 3.5 V
OK
Replace stereo component amplifier assy.
NG
Replace radio receiver assy.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст