TOYOTA HIGHLANDER 2001 Service Repair Manual

E11948
Headlamp Dimmer Switch Connector
Front View:
C13
E74263
B10
B10-17
B10-18 Multiplex Network Body ECU
Connector Front View:
05-1550
- DIAGNOSTICSLIGHTING SYSTEM
1740 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK HARNESS AND CONNECTOR(HEADLAMP DIMMER SWITCH ASSY -
MULTIPLEX NETWORK BODY ECU)
(a) Disconnect the headlamp dimmer switch assy connector
and B10 connector from the multiplex network body ECU.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
C13-13 - B10-17AlwaysBelow 1 W
C13-14 - B10-18AlwaysBelow 1 W
B10-17 - Body groundAlways10 kW or higher
B10-18 - Body groundAlways10 kW or higher
C13-16 - Body groundAlwaysBelow 1 W
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE MULTIPLEX NETWORK BODY ECU

E68822E70389
4
3
1 A23
Automatic Light Control Sensor
21
20
12 B9
B9
B9CLTS
CLTE
CLTB R
W
GBody ECU
CLTS
CLTE
CLTB
- DIAGNOSTICSLIGHTING SYSTEM
05-1551
1741 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1244 LIGHT SENSOR CIRCUIT MALFUNCTION
CIRCUIT DESCRIPTION
This DTC is output when a failure in the automatic light control sensor circuit is detected.
DTC No.DTC Detecting ConditionTrouble Area
B1244
Malfunction of automatic light control sensor
Automatic light control sensor
Wi h tB1244
Malfunction of automatic light control sensor

Open or short in automatic light control sensor circuit
Wire harness or connector

Multiplex network body ECU
WIRING DIAGRAM
05IQ8-01

I39976
Wire Harness View:
Automatic Light Control Sensor
A23
1 3
I39976
Wire Harness View:
Automatic Light Control Sensor
A23
4
E74263
B9
B9-21 Multiplex Network Body ECU
Connector Front View:
05-1552
- DIAGNOSTICSLIGHTING SYSTEM
1742 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK HARNESS AND CONNECTOR(AUTOMATIC LIGHT CONTROL SENSOR
POWER SOURCE CIRCUIT)
(a) Disconnect the automatic light control sensor connector.
(b) Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connectionConditionSpecified condition
A23-1 - A23-3Ignition switch ON10 to 14 V
NG Go to step 4
OK
2 CHECK HARNESS AND CONNECTOR(MULTIPLEX NETWORK BODY ECU -
AUTOMATIC LIGHT CONTROL SENSOR)
(a) Disconnect the B9 connector from the multiplex network
body ECU.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
A23-4 - B9-21AlwaysBelow 1 W
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK

I39976
Wire Harness View:
Automatic Light Control Sensor
A23
1
- DIAGNOSTICSLIGHTING SYSTEM
05-1553
1743 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 REPLACE AUTOMATIC LIGHT CONTROL SENSOR
OK: Return to normal condition.
NG REPLACE MULTIPLEX NETWORK BODY ECU
OK
END
4 CHECK HARNESS AND CONNECTOR(MULTIPLEX NETWORK BODY ECU -
AUTOMATIC LIGHT CONTROL SENSOR)
(a) Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connectionConditionSpecified condition
A23-1 - Body groundIgnition switch ON10 to 14 V
NG Go to step 6
OK

I39976
Wire Harness View:
Automatic Light Control Sensor
A23
3
E74263
B9
B9-20 Multiplex Network Body ECU
Connector Front View:
05-1554
- DIAGNOSTICSLIGHTING SYSTEM
1744 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
5 CHECK HARNESS AND CONNECTOR(MULTIPLEX NETWORK BODY ECU -
AUTOMATIC LIGHT CONTROL SENSOR)
(a) Disconnect the B9 connector from the multiplex network
body ECU.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
A23-3 - B9-20AlwaysBelow 1 W
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE MULTIPLEX NETWORK BODY ECU

I39976
Wire Harness View:
Automatic Light Control Sensor
A23
1
E74263
B9
B9-12 Multiplex Network Body ECU
Connector Front View:
- DIAGNOSTICSLIGHTING SYSTEM
05-1555
1745 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
6 CHECK HARNESS AND CONNECTOR(MULTIPLEX NETWORK BODY ECU -
AUTOMATIC LIGHT CONTROL SENSOR)
(a) Disconnect the B9 connector from the multiplex network
body ECU.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
A23-1 - B9-12AlwaysBelow 1 W
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE MULTIPLEX NETWORK BODY ECU

- DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
05-2065
2255 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1261 ECM (ENGINE ECU) COMMUNICATION
STOP
CIRCUIT DESCRIPTION
B1261 will be output when the communication between the ECM and multiplex network body ECU stops
for more than 10 seconds.
DTC No.DTC Detecting ConditionTrouble Area
B1261No communication from ECM for more than 10 seconds
ECM

Wire harness
0523Z-04

B78728
Engine Room J/BB10
Multiplex Network Body ECU
ECM
Combination Meter Assy (Meter ECU)J7
J/C E6
MREL
13E5
MPX2 4
IK3
MPX+9 BatteryBR
J2
J/C FL MAINMPX1
4
7 5 2I 2B
2F2B 2B
F7
FL Block
Assy6
15
EFI
No.1EFI
Relay
B-W W
IK2
E5 BATT
EH3
+B IK2
W-BW3
Y
A BBR
GR*
1
IE1
ED 10
11
E5
W W
W13E6
829
A E9 E7
11
BR 6
IL2 1 GR
GR
SB
C12
*
1: 2AZ-FE
*2: 3MZ-FEA
Sliding Roof
Contorl ECUMPX1 S20W
MPX1
*
2
*1
*2EE
+B2 E51
2 1
2
W
10 P-L18
E1 05-2066
- DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2256 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
WIRING DIAGRAM

H45688
ECM
Multiplex Network Body ECUE5
B10
C12 Combination Meter Assy (Meter ECU)E6
- DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
05-2067
2257 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 CHECK CONTINUITY OF COMMUNICATION LINE
(a) Check the wire harness between the combination meter assy (meter ECU), ECM and multiplex net-
work body ECU

A53766
E7
E8E9 E6E5
05-2068
- DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2258 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
(1) Disconnect the connectors of the meter assy, ECM and body ECU.
(2) Inspect the continuity between terminals E6-18 (MPX1) of the ECM vehicle's side connector and
B10-6 (MPX1) of the body ECU vehicle's side connector.
Standard:
Symbols (Terminal No.)Specified Condition
MPX1 (E6-18) @ MPX1 (B10-6)
(equipped with 1MZ-FE)Continuity
MPX1 (E6-18) @ MPX1 (B10-6)
(equipped with 2AZ-FE)Continuity
(3) Inspect the continuity between terminals E6-29 (MPX2) of the ECM vehicle's side connector and
C12-9 (MPX+) of the meter assy vehicle's side connector.
Standard:
Symbols (Terminal No.)Specified Condition
MPX2 (E6-29) @ MPX+ (C12-9)
(equipped with 1MZ-FE)Continuity
MPX2 (E6-29) @ MPX+ (C12-9)
(equipped with 2AZ-FE)Continuity
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
2 CHECK ECM
(a) Inspect the ECM (power source input).
NOTICE:
Do not disconnect the ECM connector. The inspection should be started from the backside of the
connector.
Standard:
Symbols (Terminal No.)In/OutputConditionSpecified Condition
BATT (E5-3) @ Body groundInputConstant9 - 14 V
+B (E5-1) @ Body groundInputEngine stopped, ignition switch ON9 - 14 V
+B2 (E5-2) @ Body groundInputEngine stopped, ignition switch ON9 - 14 V
NG REPAIR OR REPLACE FUSE OR WIRE
HARNESS AND CONNECTOR
OK