Lexus SC300 / Lexus SC400. Manual — part 34
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Automatic Control Switch Circuit
CIRCUIT DESCRIPTION
The SW contact is ON while the automatic control SW is pushed, and
turns OFF when automatic control SW is released. When the SW is
turned ON, the voltage at the SAUTO terminal of A/C control assem-
bly is almost 0 V and the ECU begins fully automatic control of the
blower speed, air inlet, air outlet and compressor operation.
DIAGNOSTIC CHART
Check voltage between terminal SAUTO
and SG of A/C control assembly.
Check automatic control SW.
Check for open and short in harness and
connector between automatic control SW
and ECU.
Check and replace A/C control assembly.
Proceed to next circuit inspection on
Replace automatic control SW.
Repair or replace harness or
connector.
AC–96
–
AIR CONDITIONING SYSTEM
Troubleshooting
Check voltage between terminal SAUTO and SG of A/C control
assembly.
(2)
Remove A/C control assembly with connectors
still connected.
Proceed to next circuit inspection shown on
matrix chart. ( See page
(3)
Turn ignition switch on.
(1)
Remove console upper panel. (See page
Measure voltage between terminal SAUTO and Sg
of A/C control assembly when automatic control SW
is operated.
Disconnect automatic control switch connector.
Measure resistance between terminal and of auto-
matic control switch connector when it is is
operated.
Replace automatic control switch.
Check automatic control switch.
Check for open and short in harness and connector between switch and
A/C control assembly (See page
Repair or replace harness or connector.
Check and replace A/C control assembly.
INSPECTION PROCEDURE
–
AIR CONDITIONING SYSTEM
Troubleshooting
AC–97
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Diagnosis Circuit
CIRCUIT DESCRIPTION
This circuit sends signals to the A/C control assembly requesting output of diagnostic codes.
DIAGNOSTIC CHART
WIRING DIAGRAM
Check voltage between terminals Tc and
E1 of TDCL.
Check harness and connector between air
conditioner control assembly and TDCL and
body ground.
Proceed to next circuit inspection
shown on matrix chart (See page
Repair or replace harness or
connector.
Check and replace air conditioner control
assembly.
AC–98
–
AIR CONDITIONING SYSTEM
Troubleshooting
Check voltage between terminal Tc and E1 of TDCL.
(2)
Check voltage between terminals Tc and E1 of
TDCL.
Voltage:
10 – 14 V
(1)
Turn ignition switch on.
Proceed to next circuit inspection shown on
matrix chart. ( See page
).
Check for open and short in harness and connector between air conditioner con-
trol assembly and TDCL, TDCL and body ground.(See page
Repair or replace harness or connector.
Check and replace air conditioner control
assembly.
INSPECTION PROCEDURE
–
AIR CONDITIONING SYSTEM
Troubleshooting
AC–99
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