Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 21pl9 ciaud
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05-1366
DIAGNOSTICS - NAVIGATION SYSTEM 05NRF-01
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 navigation 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
C13 Spiral Cable Radio and
Steering Pad Switch LH Sub-assy Navigation Assy
7 7
AU1 AU1 LG LG
IF3 R13 SW1
12 12
Volume- Volume+ Seek- Seek+
6 6
EAU EAU Y Y
IF3 R13 SWG
10 10
MODE
8 8
AU2 AU2 L L
IF3 R13 SW2
11 11
I45230
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1549
05-1367
DIAGNOSTICS - NAVIGATION SYSTEM
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 60-1 ).
1 INSPECT RADIO AND NAVIGATION ASSY
Wire Harness View: (a) Disconnect the radio and navigation assy connector R13.
(b) Measure the resistance according to the value(s) in the
table below.
R13 Standard:
Tester connection Condition Specified condition
SW1 - SWG No switch is pushed Approx. 100 k
SW1 - SWG SEEK+ switch: push Approx. 0
SW1 - SWG SEEK- switch: push Approx. 0.3 k
SW2 SW1 SWG I38660 SW1 - SWG VOL+ switch: push Approx. 1 k
SW1 - SWG VOL- switch: push Approx. 3.2 k
SW2 - SWG No switch is pushed Approx. 100 k
SW2 - SWG MODE switch: push Approx. 0
NG Go to step 2
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE PAGE 05-1286 )
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1550
05-1368
DIAGNOSTICS - NAVIGATION SYSTEM
2 INSPECT STEERING PAD SWITCH ASSY
Connector Front View:
C13
AU1
AU2
EAU
I39169
(a) Disconnect the steering pad switch assy connector C13.
(b) Measure the resistance according to the value(s) in the table below.
Standard:
Tester connection Condition Specified condition
AU1 - EAU No switch is pushed Approx. 100 k
AU1 - EAU SEEK+ switch: push Approx. 0
AU1 - EAU SEEK- switch: push Approx. 0.3 k
AU1 - EAU VOL+ switch: push Approx. 1 k
AU1 - EAU VOL- switch: push Approx. 3.2 k
AU2 - EAU No switch is pushed Approx. 100 k
AU2 - EAU MODE switch: push Approx. 0
NG REPLACE STEERING PAD SWITCH LH
(SEE PAGE 67-28 )
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1551
05-1369
DIAGNOSTICS - NAVIGATION SYSTEM
3 INSPECT SPIRAL CABLE SUB-ASSY
Steering Pad Switch Assy Side: (a) Disconnect the steering pad switch assy and spiral cable
sub-assy connectors.
EAU AU2 AU1
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connection Specified condition
EAU - EAU Below 1
AU1 - AU1 Below 1
AU2 - AU2 Below 1
Vehicle Side:
EAU AU2 AU1
I36956
NG REPLACE SPIRAL CABLE SUB-ASSY
(SEE PAGE 60-28 )
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1552
05-1370
DIAGNOSTICS - NAVIGATION SYSTEM
4 CHECK HARNESS AND CONNECTOR(SPIRAL CABLE SUB-ASSY - RADIO AND
NAVIGATION ASSY)
Radio and Navigation Assy (a) Disconnect the connectors from the spiral cable sub-
Wire Harness View: assy and radio and navigation assy.
(b) Measure the resistance according to the value(s) in the
table below.
R13 Standard:
Tester connection Specified condition
SW1 - AU1 Below 1
SW2 - AU2 Below 1
SW2
SW1 SWG I38660 SWG - EAU Below 1
SW1 - Body ground 10 k or higher
SW2 - Body ground 10 k or higher
Spiral Cable Sub-assy
SWG - Body ground 10 k or higher
Connector Front View:
AU1
EAU AU2 NG REPAIR OR REPLACE HARNESS OR
I36955 I38235 CONNECTOR
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE PAGE 05-1286 )
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1553
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