Lexus ES300 (1997 year). Manual — part 448
I00343
A/C Control Assembly
MGCR
AC1
ACT
A14
10
A14
13
A14
2
L–Y
IM2
7
L–Y
L–W
1
1
1
1
2C
2K
5
9
1W
HEATER
B–Y
LG–R
16
5
A/C
ACT
ECM
MG CLT
4
2
2
From HTR Relay
Magnetic Clutch Relay
L–B
L–B
B–W
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–569
721
1997 LEXUS ES300 (RM511U)
Compressor Circuit
CIRCUIT DESCRIPTION
The A/C control assembly outputs the magnetic clutch ON signal from terminal AC1 to the ECM. When the
ECM receives this signal, it sends a signal from terminal ACT and switches the A/C magnetic clutch relay
ON, thus turning on the A/C magnetic clutch.
WIRING DIAGRAM
DI0DJ–01
I00344
MGCR(+)
(–)
AC3027
1
3
2
5
3
2
5
1
DI–570
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
722
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check voltage between terminal MGC of A/C control assembly connector and
body ground.
PREPARATION:
(a)
Remove A/C control assembly with connectors still con-
nected (See page
(b)
Start the engine and push AUTO switch.
CHECK:
Check voltage between terminal MGC of A/C control assembly
connector and body ground when magnetic clutch is ON and
OFF by A/C switch.
OK:
A/C switch
Voltage
ON
Below 1 V
OFF
10 – 14 V
NG
Go to step 5.
OK
2
Check magnetic clutch relay.
PREPARATION:
Remove magnetic clutch relay from R/B No.5.
CHECK:
Check continuity between each pair of terminals shown below
of magnetic clutch relay.
OK:
Tester connection
Specified condition
1 – 2
62.5 – 90.9
Ω
3 – 5
No continuity
PREPARATION:
Apply battey positive (+) voltage between terminals 1 and 2.
CHECK:
Check continuity between terminals 3 and 5.
OK:
There is continuity.
NG
Replace magnetic clutch relay.
OK
N01150
I00340
AC1(+)
(–)
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–571
723
1997 LEXUS ES300 (RM511U)
3
Check A/C magnetic clutch.
PREPARATION:
Disconnect magnetic clutch connector.
CHECK:
Connect positive (+) lead connected to battery to magnetic
clutch connector terminal 4.
OK:
Magnetic clutch is energized.
NG
Repair A/C magnetic clutch.
OK
4
Check harness and connector between magnetic clutch relay and A/C compers-
sor, A/C compressor and body ground (See page
NG
Repair or replace harness or connector.
OK
Proceed to next circuit inspeciton shown on
matrix chart (See page
).
5
Check voltage between terminal AC1 of A/C control assembly connector side
and body ground.
PREPARATION:
(a)
Disconnect A/C control connector.
(b)
Ignition switch ON.
CHECK:
Check voltage between terminal AC1 of A/C control assembly
harness side connector.
OK:
Voltage: 10 – 14 V
NG
Check and replace ECM.
Ok
I00341
AC1(+)
(–)
I00342
ACT(+)
(–)
DI–572
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
724
1997 LEXUS ES300 (RM511U)
6
Check voltage between terminal AC1 of A/C control assembly connector and
body ground.
PREPARATION:
(a)
Remove A/C control assembly with connector still con-
nected (See page
(b)
Start the engine and push AUTO switch.
CHECK:
Check the voltage between terminal AC1 of A/C control assem-
bly connector and body ground when magnetic clutch is ON
and OFF by A/C switch.
OK:
Magnetic clutch
Voltage
ON
Below 1 V
OFF
10 – 14 V
NG
Check and replace A/C control assembly.
OK
7
Check voltage between terminal ACT of A/C control assembly and body ground.
PREPARATION:
(a)
Remove A/C control assembly with connectors still con-
nected (See page
(b)
Start the engine and push AUTO switch.
CHECK:
Check the voltage between terminal ACT of A/C control assem-
bly and body ground.
OK:
A/C switch
Voltage
ON
10 – 14 V
OFF
Below 1.5 V
NG
Check and replace ECM.
OK
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