Toyota Sequoia (2005). Manual — part 551
I28476
R6
Light Control
Rheostat Assy
Radio Receiver Assy
J/C
Steering Pad Switch
Spiral Cable
Sub–assy
From
TAILLIGHT
Relay
ILL–
GND
J/C
ILL+
W–G
G
J39
J40
J39
J40
J39
J40
R4
R19
R4
R3
R2
W–G
G
G
G
A
B
A
A
A
B
ILL–
T
12
5
2
10
6
A–1
A–10
C9–1
BR–W
C9–10
(*1)
*1: Separate Type Amplifier
*2: Built–in Type Amplifier
(*2)
(*1) (*2)
6
4
–
DIAGNOSTICS
AUDIO SYSTEM
DI–1999
2193
Illumination circuit
CIRCUIT DESCRIPTION
Power is supplied to the radio receiver panel illumination when the light control switch is in the TAIL or HEAD
position. The body ECU determines the external brightness based on the brightness level detected by the
automatic light control sensor, and then operates the tail relay. Power can also be supplied by operating the
relay.
The intensity of the radio receiver panel illumination can be adjusted by the rheostat switch.
WIRING DIAGRAM
DID9X–01
DI–2000
–
DIAGNOSTICS
AUDIO SYSTEM
2194
INSPECTION PROCEDURE
NOTICE:
The vehicle is equipped with SRS (Supplemental Restraint System) such as airbags. Before servic-
ing (including removal or installation of parts), be sure to read the precautionary notice for the sup-
plemental restraint system (See page
).
1
Check illumination.
CHECK:
Check if the illumination for the radio receiver assy, steering pad switch assy or others (A/C switch, cigarette
lighter, etc.) comes on when the light control switch is turned to the HEAD or TAIL position.
RESULT:
Components with illumination
Go to step
Illumination comes on for all components except radio receiver assy.
A
Illumination comes on for all components except steering pad switch does not
come on.
B
Illumination comes on for all components except radio receiver assy, steering
pad switch, Rear heater control panel, each switch, etc.
C
All illumination does not come on. (Radio receiver assy, steering pad switch,
Combination meter, Rear heater control panel, each switch, etc.)
D
HINT:
If the illuminations have malfunctions, check the rheostat switch.
B
Go to step 4.
C
Go to step 8.
D
Go to combination meter system
(See page
A
I28739
Separate Type Amplifier
Wire Harness View:
R4
ILL+
I28743
Built–in Type Amplifier
Wire Harness View:
R2
ILL+
–
DIAGNOSTICS
AUDIO SYSTEM
DI–2001
2195
2
Check radio receiver assy (ILL+).
PREPARATION:
Disconnect 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
ILL+ (R2–10) –
Body ground (*2)
Light control switch TAIL
10 to 14 V
ILL+ (R4–2) –
Body ground (*1)
Light control switch TAIL
10 to 14 V
*1: Separate Type Amplifier
*2: Built–in Type Amplifier
NG
Repair or replace harness or connector
(Radio receiver assy – battery).
OK
I28739
Separate Type Amplifier
Wire Harness View:
ILL–
R4
I28744
Built–in Type Amplifier
Wire Harness View:
R3
ILL–
I28577
Light Control Rheostat
Wire Harness View:
R6
ILL–
DI–2002
–
DIAGNOSTICS
AUDIO SYSTEM
2196
3
Check harness and connector (Radio receiver assy – Light control rheostat).
PREPARATION:
Disconnect the radio receiver assy connector and light control
rheostat connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol (Tester connection)
Specified condition
ILL– (R3–5) – ILL– (R6–6) (*2)
Below 1
Ω
ILL– (R4–12) – ILL– (R6–6) (*1)
Below 1
Ω
ILL– (R6–6) – Body ground (*1)
10 k
Ω
or higher
*1: Separate Type Amplifier
*2: Built–in Type Amplifier
NG
Repair or replace harness or connector.
OK
Replace radio receiver assy.
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