TOYOTA HIGHLANDER 2001 Service Repair Manual

E74076
Engine Room J/B
Body ECU
HEAD LAMP Relay
Engine Room R/B
H-LP RH LWR
H-LP LH LWR
H4
Headlamp RH (Low)H2
Headlamp LH (Low)
F7
FL Block
Battery FL MAINHRLY MAIN
L-R
R-B
W-B R-W
W-B R-Y
J3
J/C
EA3
B11 R 1
2B
1
2G 3
2 4
1 2 1 1
2I4
IK3
2
2
221
21
21
21
31W W
A
A 05-1556
- DIAGNOSTICSLIGHTING SYSTEM
1746 Author
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
HEADLIGHT RELAY CIRCUIT
CIRCUIT DESCRIPTION
The multiplex network body ECU controls the HEAD relay when a signal is received from the headlamp dim-
mer switch assy.
WIRING DIAGRAM
05IQ9-01

E74263
B11
B11-3 Multiplex Network Body ECU
Connector Front View:
- DIAGNOSTICSLIGHTING SYSTEM
05-1557
1747 Author
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
1 PERFORM ACTIVE TEST USING HAND-HELD TESTER
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch to the ON position and turn the hand-held tester main switch on.
(c) Select the item below in the ACTIVE TEST and then check the relay operation.
BODY NO.1 (MULTIPLEX NETWORK BODY ECU):
ItemTest DetailsDiagnostic Note
HEAD LIGHTHeadlamp relay ON/OFF-
OK: Headlamp comes on.
NG Go to step 2
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE PAGE 05-1538)
2 INSPECT MULTIPLEX NETWORK BODY ECU
(a) Disconnect the B11 connector from the multiplex network body ECU.
(b) Using a service wire, connect B11-3 of the wire harness side and body ground.
OK: Headlamp comes on.
NG Go to step 3
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE PAGE 05-1538)

E72974
2B
2B-1 Engine Room J/B
Connector Front View:
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- DIAGNOSTICSLIGHTING SYSTEM
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 INSPECT ENGINE ROOM J/B
(a) Disconnect the 2B connector from the engine room J/B.
(b) Using a service wire, connect 2B-1 of the engine room J/B side and body ground.
OK: Headlamp comes on.
NG Go to step 4
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM J/B - MULTIPLEX NETWORK
BODY ECU)

E72974
2G
2G-1 Engine Room J/B
Connector Front View:
- DIAGNOSTICSLIGHTING SYSTEM
05-1559
1749 Author
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
4 INSPECT ENGINE ROOM J/B
(a) Measure the voltage according to the value(s) in the table below.
Standard:
Tester connectionConditionSpecified condition
2G-1 - Body groundConnect 2B-1 and body ground10 to 14 V
NG Go to step 5
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR (EACH OF HEADLAMP CIRCUIT)

E72974
2B
2B-1 Engine Room J/B
Connector Front View:
05-1560
- DIAGNOSTICSLIGHTING SYSTEM
1750 Author
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
5 INSPECT ENGINE ROOM J/B
(a) Measure the voltage according to the value(s) in the table below.
Standard:
Tester connectionConditionSpecified condition
2B-1 - Body groundAlways10 to 14 V
NG Go to step 6
OK
REPLACE ENGINE ROOM J/B

E72974
2I
2I-1 Engine Room J/B
Connector Front View:
- DIAGNOSTICSLIGHTING SYSTEM
05-1561
1751 Author
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
6 CHECK HARNESS AND CONNECTOR(POWER SOURCE CIRCUIT)
(a) Disconnect the 2I connector from the engine room J/B.
(b) Measure the voltage according to the value(s) in the table below.
Standard:
Tester connectionConditionSpecified condition
2I-1 - Body groundAlways10 to 14 V
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE ENGINE ROOM J/B

E74079
Instrument Panel J/B
Body ECU
TAILLIGHT Relay
FOG LIGHT Relay
F2
Front Fog Lamp RH
F1
Front Fog Lamp LH
F7
FL BlockTRLY
FFGO TAIL
FR FOG
W-B
R-W R-W R-W
FL MAIN
BatteryALT4
12
53 1
1A BSB
V7
B9
6
B9
W
2
1
EG EA 12
122
1J
7
1B
W-B1J
A
A
J1
J/CJ3
J/C 12
35 05-1582
- DIAGNOSTICSLIGHTING SYSTEM
1772 Author
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
FRONT FOG LIGHT CIRCUIT
CIRCUIT DESCRIPTION
The multiplex network body ECU controls the FOG relay when a signal is received from the headlamp dim-
mer switch assy.
WIRING DIAGRAM
05IQB-01

E74263
Multiplex Network Body ECU
Connector Front View:
B9
B9-7
B9-6
- DIAGNOSTICSLIGHTING SYSTEM
05-1583
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
HINT:
Inspect if the taillamp system is normal before performing this procedure.
1 INSPECT MULTIPLEX NETWORK BODY ECU
(a) Disconnect the B9 connector from the multiplex network body ECU.
(b) Using a service wire, connect B9-6 and B9-7 of the wire harness side and body ground.
OK: Front fog lamp comes on.
NG Go to step 2
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE PAGE 05-1538)

E72975
Instrument Panel Junction Block
Front Side View:
1J
1J-4 1J-2
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- DIAGNOSTICSLIGHTING SYSTEM
1774 Author
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSY
(a) Disconnect the 1J connector from the instrument panel
junction block.
(b) Using a service wire, connect 1J-2, 1J-4 of the instru-
ment panel junction block side and body ground.
OK: Front fog lamp comes on.
NG Go to step 3
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK
ASSY - MULTIPLEX NETWORK BODY ECU)

E72977
Instrument Panel Junction Block
Back Side View:
1B
1B-7
- DIAGNOSTICSLIGHTING SYSTEM
05-1585
1775 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSY
(a) Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connectionConditionSpecified condition
1B-7 - Body groundConnect 1J-2, 1J-4
and body ground10 to 14 V
NG REPLACE INSTRUMENT PANEL JUNCTION
BLOCK ASSY
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR (EACH OF FOG LAMP CIRCUIT)