Lexus ES300 (1997 year). Manual — part 450
I00373
GND(–)
LOCK
I00348
HEATER
Instrument Panel J/B
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–577
729
1997 LEXUS ES300 (RM511U)
2
Check continuity between terminal GND of A/C control assembly and body
ground.
CHECK:
Measure resistance between terminal GND of A/C control as-
sembly and body ground.
OK:
Resistance: Below 1
Ω
NG
Repair or replace harness or connector.
OK
3
Check HTR fuse.
PREPARATION:
Remove HEATER fuse in instrument panel J/B.
CHECK:
Check continuity of HEATR fuse.
OK:
There is continuity.
OK
Check for shot in all the harness and compo-
nents connected to the HEATER fuse
(See page
).
OK
Check and repair harness and connector between A/C control assembly and battery.
I00351
A/C Control Assembly
+B
13
A13
J3
W–B
W–B
1V
10
3
1W
W–B
2J
7
1
2A
ECU–B
B
F8
F6
1
1
MAIN FL
Battery
B
B
I00352
+B(+)
(–)
DI–578
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
730
1997 LEXUS ES300 (RM511U)
Back Up Power Source Circuit
CIRCUIT DESCRIPTION
This is the back–up power source for the A/C control assembly. Power is supplied even when the ignition
switch is off and is used for DTC memory, etc..
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check voltage between terminal +B fo A/C control assembly connector and body
ground.
PREPARATION:
(a)
Remove front ash receplacle (See page
(b)
Remove A/C control assembly with connectors still con-
nected (See page
CHECK:
Measure voltage between termimal +B of A/C control assembly
connector and body ground.
OK:
Voltage: 10 – 14 V
OK
Proceed to nect circuit inspection shown on
matrix chart (See page
NG
DI0DM–01
I00349
Engine Room J/B
ECU–B
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
DI–579
731
1997 LEXUS ES300 (RM511U)
2
Check ECU–B fuse.
PREPARATION:
Remove ECU–B fuse from engine room J/B.
CHECK:
Check continuity of ECU–B fuse.
OK:
There is continuity.
NG
Check for short in all the harness and compo-
nents connected to the ECU–B fuse
(See page
).
OK
Check and repair harness and connector between A/C control assembly and battery.
I00350
A/C Control Assembly
HR
A13
10
L–W
EB2
2
L–W
From MG CLT Relay
From HEATER Fuse
1
1
1
1
1
HTR Main Relay
W–B
Blower Motor
L–R
EC
DI–580
–
DIAGNOSTICS
AIR CONDITIONING SYSTEM
732
1997 LEXUS ES300 (RM511U)
Heater Main Relay Circuit
CIRCUIT DESCRIPTION
The heater main relay is switched on by signals from the A/C control assembly. It supplies power to the blow-
er motor.
WIRING DIAGRAM
DI0DN–01
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