Lexus ES300 (1997 year). Manual — part 451
I00347
HR(+)
(–)
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–581
733
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check voltage between terminal HR of A/C control assembly connector and body
ground.
PREPARATION:
(a)
Remove front ash receptacle (See page
(b)
Remove A/C control assembly with connectors still con-
nected (See page
CHECK:
Measure voltage between terminal HR of A/C control assembly
and body ground when ignition switch is ON and OFF.
OK:
Ignition Switch
Voltage
OFF
0V
ON
Blower ON
0 V
ON
Blower OFF
10 – 14 V
OK
Proceed to next circuit inspection shown on
matrix chart (See page
NG
BE1850 BE1844
I00312
3
4
5
1
2
3
4
5
1
2
I00348
Instrument Panel J/B
HEATER
DI–582
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
734
1997 LEXUS ES300 (RM511U)
2
Check heater main relay.
PREPARATION:
Remove heater main relay from .
CHECK:
Check continuity between each pair of terminals of heater main
relay shown below.
OK:
Tester connection
Specified condition
1 – 4
No continuity
2 – 4
Continuity
3 – 5
62.5 – 90.9
Ω
PREPARATION:
Apply battery positive voltage between terminals 3 and 5.
CHECK:
Check continuity between each pair of terminal shown below.
OK:
Tester connection
Specified condition
1 – 2
Continuity
2 – 4
No continuity
NG
Replace heater main relay.
OK
3
Check HEATER
PREPARATION:
Remove HEATER fuse from instrument panel J/B.
CHECK:
Check continuity of HEATER fuse.
OK:
There is continuity.
NG
Check for short in all the harness and compo-
nents connected to the HEATER fuse
(See page
).
OK
Check and repair harness and connector be-
tween A/C control assembly and battery.
I00345
A/C Control Assembly
BLW
Blower Motor
1
2
B–W
L–R
IH1
IH1
1
5
Blower Motor
Controller
4
3
2
1
IH1
2
J15
A
A
B–W
IH1
6
A14
16
II
I00346
1
2
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–583
735
1997 LEXUS ES300 (RM511U)
Blower Motor Circuit
CIRCUIT DESCRIPTION
This is the power source for the blower motor.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check blower motor.
PREPARATION:
Remove blower motor (See page
).
CHECK:
Connect positive (+) lead connected to terminal 2 of blower mo-
tor connector, negative (–) lead to terminal 1.
OK:
Blower motor operates smoothly.
NG
Replace blower motor.
OK
DI0DO–01
DI–584
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
736
1997 LEXUS ES300 (RM511U)
2
Check harness and connector between battery and blower motor, blower motor
and body ground. (See page
NG
Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown on
matrix chart (See page
).
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