TOYOTA HIGHLANDER 2001 Service Repair Manual

I41014
A15
S5-4 A/C Amplifier Connector
Wire Harness View:
A11
Mode Damper Servo Sub- assy
Wire Harness View:
SG-4
TPO
- DIAGNOSTICSAIR CONDITIONING SYSTEM
05-1 159
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
4 CHECK HARNESS AND CONNECTOR(MODE DAMPER SERVO SUB-ASSY - A/C
AMPIFIER ASSY)
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
A11-1 (SG-4) - A15-1AlwaysBelow 1 W
A11-9 (S5-4) - A15-2AlwaysBelow 1 W
A11-6 (TPO) - A15-3AlwaysBelow 1 W
A11-1 (SG-4) -
Body groundAlways10 kW or higher
A11-9 (S5-4) -
Body groundAlways10 kW or higher
A11-6 (TPO) -
Body groundAlways10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE AIRCONDITIONER AMPLIFIER ASSY

I30342
1
S5-1 SG-1
TP 12
3 2
A11
AMH
AMC 4 5A/C Amplifier Assy
A11
A11
A11 A1111
10
14
13 P
O
SB
B 3
4
5
1
2
IJ1IJ1IJ1 IJ1
IJ1 LG-R
P-L
GR Y Y-GO A14 Air Mix Damper Servo Sub-assy 05-1 160
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1441/41 AIR MIX DAMPER CONTROL SERVOMOTOR
CIRCUIT (PASSENGER SIDE)
CIRCUIT DESCRIPTION
This air mix damper servo sub-assy is controlled by the A/C amplifier assy and moves the air mix damper
servo sub-assy to the desired position.
DTC No.Detection ItemTrouble Area

Air mix damper servo sub-assy
B1441/41Air mix damper position sensor value does not change even if

Air mix damper servo sub-assy

Harness or connector between air mix damper servo sub-B1441/41Air mix dam er osition sensor value does not change even if
A/C amplifier assy operates air mix damper servo sub-assy.

Harness or connector between air mix dam er servo sub-
assy and A/C amplifier assyA/C am lifier assy o erates air mix dam er servo sub assy.assy and A/C am lifier assy

A/C amplifier assy
WIRING DIAGRAM
05IU0-01

- DIAGNOSTICSAIR CONDITIONING SYSTEM
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 PERFORM ACTUATOR CHECK
(a) Set to actuator check mode (see page 05-1 117).
(b) Press the DEF switch and change to step operation.
(c) Check the air flow temperature by hand.
Display CodeAir Mix Damper Operation
0COOL side (-5 % open)
1COOL side (-5 % open)
2COOL side (-5 % open)
3COOL side (-5 % open)
4COOL/WARM (50 % open)
5COOL/WARM (50 % open)
6WARM side (105 % open)
7WARM side (105 % open)
8WARM side (105 % open)
9WARM side (105 % open)
OK:
Air flow temperature changes in accordance 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

I30157
Air Mix Damper Servo Sub-assy
Connector Wire Harness View:
A14
I30334
To ºWARMº
To ºCOOLº
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 INSPECT AIRMIX DAMPER SERVO SUB-ASSY
(a) Remove the air mix damper servo sub-assy.
(b) Connect the positive (+) lead from the battery to terminal
4 and negative (-) lead to terminal 5, then check that the
lever turns to ºCOOLº side smoothly.
(c) Connect the positive (+) lead from the battery to terminal
5 and negative (-) lead to terminal 4, then check that the
lever turns to ºWARMº side smoothly.
NG REPLACE AIRMIX DAMPER SERVO SUB-ASSY
OK

I41014
A14
A11
AMC
AMH A/C Amplifier Connector
Wire Harness View:
Air Mix Damper Servo Sub- assy
Connector Wire Harness View:
- DIAGNOSTICSAIR CONDITIONING SYSTEM
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK HARNESS AND CONNECTOR(AIR MIX DAMPER SERVO SUB-ASSY - A/C
AMPLIFIER ASSY)
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
A11-13 (AMC) - A14-4AlwaysBelow 1 W
A11-14 (AMH) - A14-5AlwaysBelow 1 W
A11-13 (AMC) -
Body groundAlways10 kW or higher
A11-14 (AMH) -
Body groundAlways10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE AIRCONDITIONER AMPLIFIER ASSY

I30342
A15
Mode Damper Servo Sub-assy
A/C Amplifier Assy
IL2 1
S5-4 SG-4
TPO 6 1
3 29
BRA11 B
AOD 8 R
AOF
45A11
A11
A11
A117 V
G 13
3
14
15
4 IL2
IL2
IL2
IL2 W
B
G
LG
L 05-1 164
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1354 Author
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:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1443/43 AIR OUTLET DAMPER CONTROL
SERVOMOTOR CIRCUIT
CIRCUIT DESCRIPTION
This circuit turns the servomotor and changes each mode damper position by the signals from the A/C ampli-
fier assy. When the AUTO switch is on, the A/C amplifier assy changes the mode automatically between
(FACE), (BI-LEVEL) and (FOOT) according to the temperature setting.
DTC No.Detection ItemTrouble Area

Mode damper servo sub-assy.
B1443/43
Air outlet damper position sensor value does not change even
if A/C lifi t i d d b

Mode damper servo sub-assy.

Harness or connector between mode damper servo sub-
B1443/43if A/C amplifier assy operates air mode damper servo sub-
assy

Harness or connector between mode dam er servo sub-
assy and A/C amplifier assy.assy.assy and A/C am lifier assy.

A/C amplifier assy.
WIRING DIAGRAM
05IU1-01

- DIAGNOSTICSAIR CONDITIONING SYSTEM
05-1 165
1355 Author
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 PERFORM ACTUATOR CHECK
(a) Warm up engine.
(b) Set to actuator check mode (see page 05-1 117).
(c) Press the DEF switch and change it to step operation
(d) Press the DEF switch and check that the air flow by hand.
Display codeAir flow condition
0FACE
1FACE
2FACE
3FACE
4FACE
5B/L
6FOOT
7FOOT
8FOOT/DEF
9DEF
OK:
Air flow position changes in accordance 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

I30157
Mode Damper Servo Sub-assy
Connector Wire Harness View:
A15
I30335
To ºDEFº
To ºFACEº
05-1 166
- DIAGNOSTICSAIR CONDITIONING SYSTEM
1356 Author
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 INSPECT MODE DAMPER SERVO SUB-ASSY
(a) Remove the air mode damper servo sub-assy.
(b) Connect the positive (+) lead from the battery to terminal
4 and negative (-) lead to terminal 5 then check that the
lever turns to ºDEFº position.
(c) Connect the positive (+) lead from the battery to terminal
5 and negative (-) lead to terminal 4 then check that the
lever turns to ºFACEº position.
NG REPLACE MODE DAMPER SERVO SUB-ASSY
OK

I41014
AOF AODA15
A11
A/C Amplifier Connector
Wire Harness View:
Mode Damper Servo Sub- assy
Wire Harness View:
- DIAGNOSTICSAIR CONDITIONING SYSTEM
05-1 167
1357 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK HARNESS AND CONNECTOR(MODE DAMPER SERVO SUB-ASSY - A/C
AMPLIFIER ASSY)
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
A11-8 (AOF) - A15-5AlwaysBelow 1 W
A11-7 (AOD) - A15-4AlwaysBelow 1 W
A11-8 (AOF) -
Body groundAlways10 kW or higher
A11-7 (AOD) -
Body groundAlways10 kW or higher
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE AIRCONDITIONER AMPLIFIER ASSY

I38778
ECM
ECM
MPX1
MPX2 E6E6 186
B10 W
29MPX1
MPX2 Body ECU
B910
O
5
IF3 Y 1
IB2 GR
8MPX1 MPX2
P5
Power Window Master
SW With ECU7V
IB28
Combination Meter C129
MPX+
MPX- SB
Passenger Side J/B75
4F4ABR
S31
S311 2
Short Connector
C11Y
3E1
3J 12
G
A109 RG
(*1)
4MPD1
MPD2 IL212
G (*2)
G5
Gateway ECUA112
MPX+
11V
(*1)
MPX- A/C Amplifier
Assy
21
*1: w/ Navigation System
*2: w/o Navigation SystemGRSB 1
IL2
Center J/B 05-1 168
- DIAGNOSTICSAIR CONDITIONING SYSTEM
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1499/99 MULTIPLEX COMMUNICATION CIRCUIT
CIRCUIT DESCRIPTION
The ECM and A/C amplifier communicate via BEAN.
This DTC is output when communication stops.
DTC No.Detection ItemTrouble Area
B1499/99M lti l i ti i itO i lti l i ti i itB1499/99Multiplex communication circuit
Open in multiplex communication circuitB1499/99Multi lex communication circuit
Oen in multi lex communication circuit
WIRING DIAGRAM
0522E-05