Page 1297 of 2572
- DIAGNOSTICSAIR CONDITIONING SYSTEM
05-1 165
1355 Author: Date:
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
Page 1298 of 2572
I30157
Mode Damper Servo Sub-assy
Connector Wire Harness View:
A15
I30335
To ºDEFº
To ºFACEº
05-1 166
- DIAGNOSTICSAIR CONDITIONING SYSTEM
1356 Author: Date:
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
Page 1299 of 2572
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
Page 1300 of 2572
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
1358 Author: Date:
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 circuitOpen in multiplex communication circuitB1499/99Multi lex communication circuitOen in multi lex communication circuit
WIRING DIAGRAM
0522E-05
Page 1301 of 2572
- DIAGNOSTICSAIR CONDITIONING SYSTEM
05-1 169
1359 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK MULTIPLEX COMMUNICATION SYSTEM
NG GO TO MULTIPLEX COMMUNICATION SYSTEM
OK
REPLACE AIRCONDITIONER AMPLIFIER ASSY
Page 1302 of 2572
B51271
9
BG3
4
BG2Y
LGLOCK
UNLOCK
B14
Back Door Key Lock
and Unlock Switch
IA214
4 V
B
J14
J/C17
1
T4L Theft Warning ECU Assy
IL2
8
IL2UL 33T415
IA2
BRSB
BR
Y 2
3
BE W-B
A
I07296
LOCK
UNLOCK
05-2036
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
2226 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
BACK DOOR KEY LOCK AND UNLOCK SWITCH CIRCUIT
CIRCUIT DESCRIPTION
The back door key lock and unlock switch comes on when the back door key cylinder is turned to the unlock
side with the key.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK BACK DOOR KEY LOCK AND UNLOCK SWITCH
(a) Remove the switch.
(b) Measure the resistance.
Standard:
Tester ConnectionConditionSpecified Condition
1-2Turned to lock sideBelow 1 W
1-2, 1-3Not turned10 kW or higher
1-3Turned to unlock sideBelow 1 W
NG REPLACE BACK DOOR KEY LOCK AND
UNLOCK SWITCH
OK
05ITO-02
Page 1303 of 2572

B77251
Wire Harness Side
B14
Back Door Key
Lock and Unlock Switch
T4
Theft Warning ECU Assy
B31046
Wire Harness Side
B14
Back Door Key Lock and Unlock Switch
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
05-2037
2227 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 CHECK WIRE HARNESS
(THEFT WARNING ECU ASSY - BACK DOOR KEY LOCK AND UNLOCK SWITCH)
(a) Disconnect the T4 ECU connector.
(b) Disconnect the B14 switch connector.
(c) Measure the resistance between the wire harness side
connectors.
Standard:
Tester ConnectionSpecified Condition
B14-2 (LOCK) - T4-15 (L)Below 1 W
B14-8 (UNLOCK) - T4-33 (UL)Below 1 W
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
3 CHECK BACK DOOR KEY LOCK AND UNLOCK SWITCH (BODY GROUND)
(a) Disconnect the B14 switch connector.
(b) Measure the resistance between the wire harness side
connector and body ground.
Standard:
Tester ConnectionSpecified Condition
B14-1 - Body groundBelow 1 W
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE THEFT WARNING ECU ASSY
Page 1304 of 2572

05ESL-05
05-10
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
200 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
BASIC INSPECTION
When the malfunction is not confirmed in the DTC check, troubleshooting should be carried out in all the
possible circuits considered as possible causes of the problem. In many cases, by carrying out the basic
engine check shown in the following flowchart, the problem can be found quickly and efficiently. Therefore,
using this check is essential in the engine troubleshooting.
1 CHECK BATTERY VOLTAGE
NOTICE:
Carry out the battery voltage check with the engine stopped and ignition switch OFF.
OKNG
Voltage11 V or moreLess than 11 V
NG CHARGE OR REPLACE BATTERY
OK
2 CHECK IF ENGINE WILL CRANK
NG PROCEED TO PROBLEM SYMPTOMS TABLE
ON PAGE 05-31
OK
3 CHECK IF ENGINE STARTS
NG Go to step 7
OK
4 CHECK AIR FILTER
Visually check if the air filter is contaminated with dirty or oily.
NG CLEAN OR REPLACE
OK
5 CHECK IDLE SPEED (See page 14-1)
NG PROCEED TO PROBLEM SYMPTOMS TABLE
ON PAGE 05-31
OK
6 CHECK FUEL PRESSURE (See page 11-4)
NG PROCEED TO PAGE 11-4 AND CONTINUE TO
TROUBLESHOOT
OK