Lexus SC300 / Lexus SC400. Service manual — part 18
![](/vehicle/tus/kendre/chaul/ndi.png)
HINT:
•
The buzzer sounds when the display code changes.
•
Codes are displayed in order from the smaller to the
larger numbers.
•
To cancel the check mode, press the OFF switch.
AC–30
–
AIR CONDITIONING SYSTEM
Troubleshooting
![](/vehicle/tus/kendre/chaul/wen.png)
A14–1
A14–2
A14–3
A14–4
A14–5
A14–6
A14–7
A14–8
A14–9
A14–10
A14–11
A14–12
A14–13
A14–14
A12–1
A14–15
A12–2
A12–3
A12–4
A12–5
A12–6
A12–7
A12–8
A12–9
A12–10
A13–25
A13–24
A13–23
A13–22
A13–21
A13–20
A13–19
A13–18
A13–17
A13–16
A13–15
A13–14
A13–13
A13–12
A13–11
A13–10
A13–9
A13–8
A13–7
A13–6
A13–5
A13–
A13–4
A13–3
A13–2
A13–1
TERMINALS OF ECU
–
AIR CONDITIONING SYSTEM
Troubleshooting
AC–31
![](/vehicle/tus/kendre/chaul/tyere.png)
STANDARD VALUE OF ECU TERMINAL
Terminals
Symbols
WiringColor
Condition
StandardValue
A14–1
A14–7
B
E
R
W–B
IG OFF
10 ~ 14 V
A14–2
A14–3
MH
MC
V
R–Y
IG OFF
13 ~ 19
A14–4
A14–5
MFRS
MREC
G
G–R
IG OFF
13 ~ 19
A14–6
A14–7
IG+
E
R–L
W–B
IG ON
10 ~ 14 V
Body
A14–7
Ground
Body
E
Ground
Body
W–B
Ground
Always
Below 1
A14–8
A14–9
FACE
DEF
W
Y–L
IG OFF
13 ~ 19
A14–15
A14–7
ACC
E
L–R
W–B
Turn ignition switch ACC
10 ~ 14 V
A12–2
A14–7
REOST
E
W–G
W–B
IG ON and turn headlight control SW
to TAIL position.
Turn Rheostat volume from most
right to left position.
Most
: 0 ~ 14 V
Right
Most
: 10 ~ 14 V
Left
A12 3
A14 7
WV
E
B Y
W B
Start
the
MAX
Temp. Control Switch:
COLD
Below 1 V
A12–3
A14–7
WV
E
B–Y
W–B
the
en-
gine
MAX
Temp. Control Switch:
HOT
10 ~ 14 V
A12 4
A14 7
MGC
E
L R
W B
Start the
engine and
A/C switch ON
Below 1 V
A12–4
A14–7
MGC
E
L–R
W–B
engine and
push AUTO
SW
A/C switch OFF
10 ~ 14 V
A12 5
A14 7
TC
E
L
W B
IG ON
H L C SW
Rheostat Most
:
Volume Right
Below 1 V
A12–5
A14–7
TC
E
L
W–B
H.L.C. SW
: TAIL position
Rheostat Turn
:
Volume Left
10 ~ 14 V
A12–6
A14–7
TAIL
E
G
W–B
Turn the light control switch to TAILposition
10 ~ 14 V
A12–7A14–7
LVE
YW–B
IG ON
Push blower SW to change
the blower speed from 1 to
10.
Speed 1: 10 ~ 14 V
Speed 10: Below 2 V
A12–8
A14–7
BLR
E
B–R
W–B
IG ON Turn the blower motor
Below 1.5 V
A12–9
A14–7
HR
E
L–W
W–B
IG ON
Turn the blower motor
Below 1 V
IG ON
Don’t turn the blower motor
10 ~ 14 V
A12 10
A14 7
RDFGR
E
R Y
W B
IG ON
Rear defogger switch ON
Below 1 V
A12–10
A14–7
RDFGR
E
R–Y
W–B
IG ON
Rear defogger switch OFF
10 ~ 14 V
A13–1
A14–7
IGN
E
BW–B
Start the engine
10 ~ 14 V
AC–32
–
AIR CONDITIONING SYSTEM
Troubleshooting
![](/vehicle/tus/kendre/chaul/astedonse.png)
–
AIR CONDITIONING SYSTEM
Troubleshooting
AC–33
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