Toyota Sequoia (2005). Manual — part 550
I28501
Steering
Pad Switch
Spiral Cable
Sub–assy
Radio Receiver Assy
SW2
GND
SW1
R19
EAU
AU2
R19
R19
AU1
EAU
AU2
AU1
C9–11
GR–R
LG–R
BR–W
C9–12
C9–10
A–11
A–12
A–10
8
7
6
–
DIAGNOSTICS
AUDIO SYSTEM
DI–1995
2189
Steering pad switch circuit
CIRCUIT DESCRIPTION
This circuit sends an operation signal from the steering pad switch to the radio receiver assy.
If there is an open in the circuit, the audio system cannot be operated by the steering pad switch.
If there is a short in the circuit, the same condition as when the switch is continuously depressed occurs.
Therefore, not only the steering pad switch cannot operate the radio receiver assy, but also the radio receiver
assy itself cannot function.
WIRING DIAGRAM
DID9W–01
I28741
SW2
SW1
GND
R19
Separate Type Amplifier
Wire Harness View:
I28745
R19
SW2
SW1
GND
Built–in Type Amplifier
Wire Harness View:
DI–1996
–
DIAGNOSTICS
AUDIO SYSTEM
2190
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
Inspect steering pad switch assy.
PREPARATION:
Disconnect the radio receiver assy connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol
(Tester connection)
Condition
Specified condition
SW1 (R19–7) –
GND (R19–6)
No switch is pushed
Approx. 100 k
Ω
SW1 (R19–7) –
GND (R19–6)
SEEK+ switch: push
Approx. 0
Ω
SW1 (R19–7) –
GND (R19–6)
SEEK– switch: push
Approx. 0.3 k
Ω
SW1 (R19–7) –
GND (R19–6)
VOL+ switch: push
Approx. 1 k
Ω
SW1 (R19–7) –
GND (R19–6)
VOL– switch: push
Approx. 3.2 k
Ω
SW2 (R19–8) –
GND (R19–6)
No switch is pushed
Approx. 100 k
Ω
SW2 (R19–8) –
GND (R19–6)
MODE switch: push
Approx. 0
Ω
NG
Go to step 2.
OK
Proceed to next circuit inspection shown in problem symptoms table (See page
I28724
EAU
AU2
AU1
Connector Front View:
–
DIAGNOSTICS
AUDIO SYSTEM
DI–1997
2191
2
Inspect steering pad switch assy.
PREPARATION:
Disconnect the steering pad switch assy connector.
CHECK:
Measure the resistance according to the value(s) in the table below.
OK:
Symbol (Tester connection)
Condition
Specified condition
AU1 (A–12) – EAU (A–10)
No switch is pushed
Approx. 100 k
Ω
AU1 (A–12) – EAU (A–10)
SEEK+ switch: push
Approx. 0
Ω
AU1 (A–12) – EAU (A–10)
SEEK– switch: push
Approx. 0.3 k
Ω
AU1 (A–12) – EAU (A–10)
VOL+ switch: push
Approx. 1 k
Ω
AU1 (A–12) – EAU (A–10)
VOL– switch: push
Approx. 3.2 k
Ω
AU2 (A–11) – EAU (A–10)
No switch is pushed
Approx. 100 k
Ω
AU2 (A–11) – EAU (A–10)
MODE switch: push
Approx. 0
Ω
NG
Replace steering pad switch assy.
OK
I28340
Steering Pad Switch Assy Side:
EAU
AU2
AU1
Vehicle Side:
EAU
AU2
AU1
C9
A
DI–1998
–
DIAGNOSTICS
AUDIO SYSTEM
2192
3
Inspect spiral cable sub–assy.
PREPARATION:
Disconnect the spiral cable sub–assy connector.
CHECK:
Measure the resistance according to the values in the table be-
low.
OK:
Symbol (Tester connection)
Specified condition
EAU (A–10) – EAU (A–10)
Below 1
Ω
AU1 (A–12) – AU1 (A–12)
Below 1
Ω
AU2 (A–11) – AU2 (A–11)
Below 1
Ω
NG
Replace spiral cable sub–assy.
OK
Repair or replace harness or connector (Radio receiver assy – spiral cable).
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст