Toyota Sequoia (2005). Manual — part 623
I28479
Steering
Pad Switch
Spiral Cable
Sub–assy
Radio and Navigation Assy
SW2
SWG
SW1
R27
EAU
AU2
AU1
EAU
AU2
AU1
C9–11
GR–R
LG–R
BR–W
C9–12
C9–10
11
12
10
8
7
6
R27
R27
–
DIAGNOSTICS
NAVIGATION SYSTEM
DI–2287
2481
Steering pad switch circuit
CIRCUIT DESCRIPTION
This circuit sends an operation signal from the steering pad switch assy to the radio and navigation assy.
If there is an open in the circuit, the audio system cannot be operated by the steering pad switch assy.
If there is a short in the circuit, the resulting condition is the same as if the switch were continuously de-
pressed. Therefore, the radio and navigation assy cannot be operated by the steering pad switch assy, and
the radio and navigation assy itself cannot function.
WIRING DIAGRAM
DIDDO–01
I28299
SW1
SW2
SWG
R27
DI–2288
–
DIAGNOSTICS
NAVIGATION SYSTEM
2482
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 radio and navigation assy.
PREPARATION:
Disconnect the radio and navigation assy connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol
(Tester connection)
Condition
Specified condition
SW1 (R27–7) –
SWG (R27–6)
No switch is pushed
Approx. 100 k
Ω
SW1 (R27–7) –
SWG (R27–6)
SEEK+ switch: push
Approx. 0
Ω
SW1 (R27–7) –
SWG (R27–6)
SEEK– switch: push
Approx. 0.3 k
Ω
SW1 (R27–7) –
SWG (R27–6)
VOL+ switch: push
Approx. 1 k
Ω
SW1 (R27–7) –
SWG (R27–6)
VOL– switch: push
Approx. 3.2 k
Ω
SW2 (R27–8) –
SWG (R27–6)
No switch is pushed
Approx. 100 k
Ω
SW2 (R27–8) –
SWG (R27–6)
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
C9
–
DIAGNOSTICS
NAVIGATION SYSTEM
DI–2289
2483
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 (C9–12) – EAU (C9–10)
No switch is pushed
Approx. 100 k
Ω
AU1 (C9–12) – EAU (C9–10)
SEEK+ switch: push
Approx. 0
Ω
AU1 (C9–12) – EAU (C9–10)
SEEK– switch: push
Approx. 0.3 k
Ω
AU1 (C9–12) – EAU (C9–10)
VOL+ switch: push
Approx. 1 k
Ω
AU1 (C9–12) – EAU (C9–10)
VOL– switch: push
Approx. 3.2 k
Ω
AU2 (C9–11) – EAU (C9–10)
No switch is pushed
Approx. 100 k
Ω
AU2 (C9–11) – EAU (C9–10)
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
DI–2290
–
DIAGNOSTICS
NAVIGATION SYSTEM
2484
3
Inspect spiral cable sub–assy.
PREPARATION:
Disconnect the steering pad switch assy and spiral cable sub–
assy connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connection
Specified condition
EAU – EAU
Below 1
Ω
AU1 – AU1
Below 1
Ω
AU2 – AU2
Below 1
Ω
NG
Replace spiral cable sub–assy.
OK
Repair or replace harness or connector (Radio and navigation assy – spiral cable).
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст