Page 1489 of 2572
I38764
A10
BLW
A/C Amplifier
Connector
Wire Harness View:
I31456
GND 2V/
Division
500m sec./ Division
05-1 186
- DIAGNOSTICSAIR CONDITIONING SYSTEM
1376 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
7 INSPECT AIR CONDITIONING AMPLIFIER(BLW - BODY GROUND)
(a) Remove the A/C amplifier with the connectors still con-
nected.
(b) Turn the ignition switch to the ON position.
(c) Turn the blower switch on (Lo).
(d) Measure the waveform between terminal BLW (A10-17)
of the A/C amplifier and body ground.
OK:
Waveform operates as shown in the illustration.
HINT:
Waveform varies with the blower level.
NG REPLACE AIR CONDITIONING AMPLIFIER
OK
REPLACE BLOWER MOTOR CONTROL
Page 1490 of 2572
I30344
A/C Amplifier Assy A13
Recirculation Damper Servo Sub-assy
(Air Inlet Control Servo Motor)
Y
W
B4
6
5 5
2
1A10
A10
A10MR/F
AIF
AIR
- DIAGNOSTICSAIR CONDITIONING SYSTEM
05-1 177
1367 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
RECIRCULATION DAMPER SERVOMOTOR CIRCUIT
CIRCUIT DESCRIPTION
The A/C amplifier assy controls the recirculation damper servo sub-assy and moves it to the desired posi-
tion.
WIRING DIAGRAM
05IU5-02
Page 1491 of 2572
05-1 178
- DIAGNOSTICSAIR CONDITIONING SYSTEM
1368 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 PERFORM ACTUATOR CHECK
(a) Remove the glove box to see and check the recirculation damper servo sub-assy operation.
(b) Set to the actuator check mode (see page 05-1 117).
(c) Press the DEF switch and change it to step operation.
(d) Press the DEF switch in order and check the operation of recirculation damper servo sub-assy.
Display codeRecirculation damper position
0FRESH
1FRESH
2FRESH
3FRESH
4RECIRCULATION
5RECIRCULATION
6RECIRCULATION
7RECIRCULATION
8RECIRCULATION
9RECIRCULATION
OK:
Recirculation damper position changes in accor-
dance with each display code.
Result:
NGA
OK
(Checking from the PROBLEM SYMPTOMS TABLE)B
OK (Checking from the DTC)C
B PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE (SEE
PAGE 05-1 129)
C REPLACE AIRCONDITIONER AMPLIFIER ASSY
A
Page 1492 of 2572
I30157
A13 Recirculation Damper Servo Sub-assy
Connector Wire Harness View:
I30336
To ºFRESHº
To ºRECIRCULATIONº
- DIAGNOSTICSAIR CONDITIONING SYSTEM
05-1 179
1369 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 INSPECT RECIRCULATION DAMPER SERVO SUB-ASSY(AIR INLET CONTROL
SERVO MOTOR)
(a) Remove the recirculation damper servo sub-assy.
(b) Connect the positive (+) lead to from the battery to termi-
nal 5 and negative (-) lead to terminal 2, then check that
the lever turns to ºFRESHº side smoothly.
(c) Connect the positive (+) lead to from the battery to termi-
nal 1 and negative (-) lead to terminal 5, then check that
the lever turns to ºRECIRCULATIONº side smoothly.
NG REPLACE RECIRCULATION DAMPER SERVO
SUB-ASSY(AIR INLET CONTROL SERVO
MOTOR)
OK
Page 1493 of 2572
I41014
A13
A/C Amplifier Connector
Wire Harness View:
A10
Recirculation Damper Servo Sub-
assy Wire Harness View:
MR/F
AIR AIF
05-1 180
- DIAGNOSTICSAIR CONDITIONING SYSTEM
1370 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK HARNESS AND CONNECTOR(RECIRCULATON DAMPER SERVO
SUB-ASSY (AIR INLET CONTROL SERVO MOTOR) - A/C AMPLIFIER ASSY)
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
A10-4 (MR/F) - A13-5AlwaysBelow 1 W
A10-6 (AIF) - A13-2AlwaysBelow 1 W
A10-5 (AIR) - A13-1AlwaysBelow 1 W
A10-4 (MR/F) -
Body groundAlways10 kW or higher
A10-6 (AIF) -
Body groundAlways10 kW or higher
A10-5 (AIR) -
Body groundAlways10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE AIRCONDITIONER AMPLIFIER ASSY
Page 1494 of 2572
I40781
A/C Amplifier Assy
ACC A10 RADIO NO. 2
AM14GR13
Battery FL MAINInstrument Panel J/B Center J/B
3A V
2ACC 3 L
W2
63
1
1A 1C 1C1K
AM1
1
2
B
2 1
ALT
WF7
Fusible Link Block3I 13 11 I15
Ignition SW
- DIAGNOSTICSAIR CONDITIONING SYSTEM
05-1 175
1365 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
ACC POWER SOURCE CIRCUIT
CIRCUIT DESCRIPTION
This circuit supplies power to the A/C amplifier assy. It supplies power to the illumination for the clock.
WIRING DIAGRAM
05IU4-01
Page 1495 of 2572

I30331ACC
A/C Amplifier Connector
Wire Harness View:
A10
I38763
A10
GND
ACC
A/C Amplifier Connector Wire Harness View:
05-1 176
- DIAGNOSTICSAIR CONDITIONING SYSTEM
1366 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK FUSE(RADIO NO. 2, AM1 FUSES)
(a) Remove the RADIO No. 2 and AM1 fuses from the instrument panel J/B.
(b) Check that the continuity exits in RADIO No. 2 and AM1 fuses.
NG REPLACE FUSE
OK
2 INSPECT AIRCONDITIONER AMPLIFIER ASSY(ACC)
(a) Remove the A/C amplifier assy with connectors still con-
nected.
(b) Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connectionConditionSpecified condition
A10-13 (ACC) -
Body groundIgnition switch ACC10 to 14 V
OK PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE (SEE
PAGE 05-1 129)
NG
3 CHECK HARNESS AND CONNECTOR(A/C AMPLIFIER ASSY - BATTERY)
(a) Remove the A/C amplifier assy and disconnect the con-
nector.
(b) Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connectionConditionSpecified condition
A10-13 (ACC) -
A10-1 1 (GND)Always10 to 14 V
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE AIRCONDITIONER AMPLIFIER ASSY
Page 1496 of 2572
05-1606
- DIAGNOSTICSLIGHTING SYSTEM
1796 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
ILLUMINATION CIRCUIT
CIRCUIT DESCRIPTION
The multiplex network body ECU controls the following.
(1) Key cylinder lamp
(2) Interior lamp
(3) Personal lamp (overhead J/B)
(4) Door courtesy lamp
05IQG-02