Page 169 of 5121
AV
STEERING SWITCH SIGNAL GND CIRCUIT
AV-25
< COMPONENT DIAGNOSIS >[AUDIO SYSTEM]
C
D
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MB A
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Component InspectionINFOID:0000000003765602
Measure the resistance between the steering switch connector ter-
minals.
Standard
JSNIA1145GB
Steering switch
ConditionResistance
Ω Con-
nectorTe r m i -
nalsCon-
nectorTe r m i -
nal
M30314
M303 17SEEK DOWN switch
ON315 – 327
SEEK UP switch ON 119 – 123
SOURCE switch ON 0
15VOL UP switch ON 119 – 123
VOL DOWN switch ON 0
Page 170 of 5121
AV-26
< ECU DIAGNOSIS >[AUDIO SYSTEM]
AUDIO UNIT
ECU DIAGNOSIS
AUDIO UNIT
Reference ValuesINFOID:0000000003765603
TERMINAL LAYOUT
PHYSICAL VALUES
JSNIA1428ZZ
Terminal
(Wire color)Description
ConditionReference value
(Approx.)
+ – Signal nameInput/
Output
2
(W)3
(B)Sound signal front LH OutputIgnition
switch
ONSound output.
4
(O/B)5
(W/R)Sound signal rear LH OutputIgnition
switch
ONSound output.
6
(W/G)15
(L/B)Steering switch signal A InputIgnition
switch
ONKeep pressing SOURCE
switch. 0 V
Keep pressing switch.1.0 V
Keep pressing switch.2.0 V
Except for above. 5.0 V
7
(V/W)Ground ACC power supply InputIgnition
switch
ACC— Battery voltage
11
(B/W)12
(BR)Sound signal front RH OutputIgnition
switch
ONSound output.
SKIB3609E
SKIB3609E
SKIB3609E
Page 171 of 5121
AV
AUDIO UNIT
AV-27
< ECU DIAGNOSIS >[AUDIO SYSTEM]
C
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MB A
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P13
(L)14
(B/W)Sound signal rear RH OutputIgnition
switch
ONSound output.
15
(L/B)GroundSteering switch signal
ground—Ignition
switch
ON—0 V
16
(GR/L)15
(L/B)Steering switch signal B InputIgnition
switch
ONKeep pressing VOL DOWN
switch.0 V
Keep pressing VOL UP
switch.1.0 V
Except for above. 5.0 V
19
(Y)Ground Battery power supply InputIgnition
switch
OFF— Battery voltage
21
(R)GroundAV communication signal
(L)Input/
Output—— —
22
(L)GroundAV communication signal
(H)Input/
Output—— —
33 — FM sub Input — — —
34 — AM-FM main Input — — —
35 Ground Antenna amp. ON signal OutputIgnition
switch
ACC—12.0 V Te r m i n a l
(Wire color)Description
ConditionReference value
(Approx.)
+ – Signal nameInput/
Output
SKIB3609E
Page 172 of 5121
AV-28
< ECU DIAGNOSIS >[AUDIO SYSTEM]
AUDIO UNIT
Wiring Diagram — BASE AUDIO —
INFOID:0000000003765604
JCNWM0876GB
Page 173 of 5121
AV
AUDIO UNIT
AV-29
< ECU DIAGNOSIS >[AUDIO SYSTEM]
C
D
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F
G
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I
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K
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MB A
O
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JCNWM0877GB
Page 174 of 5121
AV-30
< ECU DIAGNOSIS >[AUDIO SYSTEM]
AUDIO UNIT
JCNWM0878GB
Page 175 of 5121
AV
AUDIO UNIT
AV-31
< ECU DIAGNOSIS >[AUDIO SYSTEM]
C
D
E
F
G
H
I
J
K
L
MB A
O
P
JCNWM0879GB
Page 176 of 5121
AV-32
< ECU DIAGNOSIS >[AUDIO SYSTEM]
AUDIO UNIT
JCNWM0880GB