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DI-776
DIAGNOSTICS - AIR CONDITIONING SYSTEM
DI6RT-02
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 ACON and switches the A/C magnetic clutch relay
ON, thus turning on the A/C magnetic clutch.
WIRING DIAGRAM
A3 Magnetic Clutch
5 Engine Room J/B
3
2B A/C Control Assembly
L-B
J/B No.3 Magnetic
Clutch Relay
1 10 14 4 6 12 22
5 L-B Y
3A 3H IF3 2C 2C IF3 A15 ACIN
R-W R-W 3
2
R-W 2 Y
Driver Side J/B 2C
1
IG1 Relay D4 Diode
11 HTR 1
W
1I 1G 2 3
2 1
4 3
W-R
1C 1B 1 From
3 4 Fan No. 3
LG-B
I15 Ignition Switch Relay
Driver Side J/B
7 W-B
4 2 1 2
IF1
IG1 AM1 W-L 1H 1I
Engine Room R/B No.5 W-L
AM1 LG-R
1 2 IG ECM
5 5
6
ACMG E7
B Engine Room J/B
F10 1
1 1 1 7 10
B-L Y-R
2H 2G F8 ACI E7 A16 A/C
ALT
Battery FL MAIN 1
F6 FL Block
B
I14100
2001 SIENNA (RM787U)
Author : Date : 930
DI-777
DIAGNOSTICS - AIR CONDITIONING SYSTEM
INSPECTION PROCEDURE
1 Check voltage between terminal ACMG of ECM and body ground.
START ACMG CHECK:
(a) Start engine.
ECM Terminals
(b) Push AUTO SW.
(c) Measure voltage between terminal ACMG of ECM con-
nector and body ground when A/C switch is On and OFF.
OK:
(-) (+) A/C switch Voltage
ON 10 - 14 V
BE6653
A05306 I15000
OFF 0V
NG Go to step 5.
OK
2 Check magnetic clutch relay.
PREPARATION:
2 3 Remove magnetic clutch relay from engine room J/B.
CHECK:
5 3
Check continuity between each pair of terminals shown below
1 2 of magnetic clutch relay.
OK:
Tester connection Specified condition
1 5
1-2 62.5 - 90.9
Z18060
3-5 No continuity
PREPARATION:
Apply battery positive (+) voltage between terminals 1 and 2.
CHECK:
Check continuity between terminals 3 and 5.
OK:
Continuity exists.
NG Replace magnetic clutch relay.
OK
2001 SIENNA (RM787U)
Author : Date : 931
DI-778
DIAGNOSTICS - AIR CONDITIONING SYSTEM
3 Check A/C magnetic clutch.
PREPARATION:
4 Disconnect magnetic clutch connector.
CHECK:
Connect positive (+) lead connected to battery to magnetic
clutch connector terminal 3.
OK:
Magnetic clutch is energized.
I02429 NG Repair A/C magnetic clutch.
OK
4 Check harness and connector between magnetic clutch relay and ECM, A/C
compressor and body ground (See page IN-31 ).
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown on
problem symptons table (See page DI-697 ).
5 Check voltage between terminal AC1 of A/C control assembly connector side
and body ground.
PREPARATION:
ON (a) Disconnect A/C control assembly connector.
(b) Turn ignition switch ON.
CHECK:
Check voltage between terminal AC1 of A/C control assembly
harness side connector.
OK:
(+) (-) Voltage : 10 - 14 V
AC1
I21146
NG Check and replace ECM.
OK
2001 SIENNA (RM787U)
Author : Date : 932
DI-779
DIAGNOSTICS - AIR CONDITIONING SYSTEM
6 Check voltage between terminal AC1 of A/C control assembly connector and
body ground.
PREPARATION:
AC1
START (a) Remove A/C control assembly with connector still con-
nected.
(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.
I21147 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 ACIN of A/C control assembly and body ground.
ACIN PREPARATION:
START (a) Remove A/C control assembly with connectors still con-
nected.
(b) Start the engine and push AUTO switch.
CHECK:
Check the voltage between terminal ACIN of A/C control as-
(-) sembly and body ground.
(+) OK:
I21148 Magnetic clutch Voltage
ON 10 - 14 V
OFF Below 1.5 V
NG Check and replace A/C control assembly.
OK
2001 SIENNA (RM787U)
Author : Date : 933
DI-780
DIAGNOSTICS - AIR CONDITIONING SYSTEM
8 Check harness and connector between magnetic clutch relay and A/C control
assembly, compressor and body ground (See page IN-21 ).
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown on
problem symptoms table (See page
DI-697 ).
2001 SIENNA (RM787U)
Author : Date : 934
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