05-1643
DIAGNOSTICS - AUDIO SYSTEM 05IRM-01
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 that when the switch is continuously depressed occurs.
Therefore, the radio receiver assy cannot be operated by the steering pad switch, and also the radio receiver
assy itself does not function.
WIRING DIAGRAM
C16 A
Steering Pad SW LH Spiral Cable Sub-assy Radio Receiver Assy
3 7
12 12 12 GR R
AU1 AU1 AU1 IL1 R23 SW1
4 8
11 11 11 B LG
AU2 AU2 AU2 IL1 R23 SW2
5 6
10 10 10 L GR
EAU EAU EAU IL1 R23 GMD
I39166
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
Author: Date: 1833
05-1644
DIAGNOSTICS - AUDIO SYSTEM
INSPECTION PROCEDURE
1 INSPECT RADIO RECEIVER ASSY
(a) Disconnect the connectors from the radio receiver assy.
(b) Measure the resistance according to the values in the
R23
table below.
Standard:
SW1 GMD Tester connection Condition Specified condition
SW1 - GMD Do not switch position Approx. 100 kΩ
SW1 - GMD SEEK+ switch: push Approx. 0 Ω
SW2 SW1 - GMD SEEK- switch: push Approx. 0.3 kΩ
I40203
SW1 - GMD VOL+ switch: push Approx. 1 kΩ
SW1 - GMD VOL- switch: push Approx. 3.2 kΩ
SW2 - GMD Do not switch position Approx. 100 kΩ
SW2 - GMD MODE switch: push Approx. 0 Ω
NG Go to step 2
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE PAGE 05-1632 )
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
Author: Date: 1834
05-1645
DIAGNOSTICS - AUDIO SYSTEM
2 INSPECT STEERING PAD SWITCH LH(AU1,AU2,EAU)
C16
AU1
AU2
EAU
I39169
(a) Disconnect the steering pad switch LH connector.
(b) Measure the resistance according to the values in the table below.
Standard:
Tester connection Condition Specified condition
AU1 - EAU Do not switch position Approx. 100 kΩ
AU1 - EAU SEEK+ switch: push Approx. 0 Ω
AU1 - EAU SEEK- switch: push Approx. 0.3 kΩ
AU1 - EAU VOL+ switch: push Approx. 1 kΩ
AU1 - EAU VOL- switch: push Approx. 3.2 kΩ
AU2 - EAU Do not switch position Approx. 100 kΩ
AU2 - EAU MODE switch: push Approx. 0 Ω
NG REPLACE STEERING PAD SWITCH LH
(SEE PAGE 67-28 )
OK
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
Author: Date: 1835
05-1646
DIAGNOSTICS - AUDIO SYSTEM
3 CHECK HARNESS AND CONNECTOR(SPIRAL CABLE SUB-ASSY - RADIO
RECEIVER ASSY)
Radio Receiver Assy: (a) Disconnect the connectors from the spiral cable sub-
assy and radio receiver assy R23.
R23
(b) Measure the resistance according to the values in the
table below.
SW1 GMD Standard:
Tester connection Specified condition
SW1 - AU1 Below 1 Ω
SW2 SW2 - AU2 Below 1 Ω
I40203 GMD - EAU Below 1 Ω
SW1 - Body ground 10 kΩ or higher
SW2 - Body ground 10 kΩ or higher
Spiral Cable Side:
GMD - Body ground 10 kΩ or higher
A
NG REPAIR OR REPLACE HARNESS OR
EAU AU2 AU1 CONNECTOR
I36955 I38235
OK
REPLACE SPIRAL CABLE SUB-ASSY (SEE PAGE 60-26 )
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
Author: Date: 1836
