Page 1345 of 2572

P
A90343
A80017
A91474
Engine Room J/B
ETCS EFI NO. 1
Engine Room R/B No. 2
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-41
231 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2. CLEAR DTC (Using the OBD II scan tool or hand-held
tester)
(a) Connect the OBD II scan tool or the hand-held tester to
the DLC3.
(b) Turn the ignition switch ON.
(c) Erase DTCs and freeze frame data with the OBD II scan
tool (complying with SAE J1978) or the hand-held tester.
For the hand-held tester: 1) enter the following menus:
DIAGNOSIS / ENHANCED OBD II / DTC INFO / CLEAR
CODES; and 2) press YES. For the OBD II scan tool, see
its instruction manual.
3. CLEAR DTC (Not using the OBD II scan tool or hand-
held tester)
(a) Remove the EFI NO. 1 fuse from the engine room J/B and
ETCS fuse from the engine room R/B No. 2 for more than
60 seconds.
Or, disconnect the battery cable for more than 60 se-
conds. After disconnecting the battery terminal, perform
the ºINITIALIZEº procedure (see page 05-893).
Page 1346 of 2572

E74082
Multiplex Communication System
Power Window Master SW with ECUBody ECU
D12
Door Key Lock and Unlock SW Front LH
Door Lock Motor Front LH
Door Unlock Detection SW
Front LH
D13
Door Key Lock and Unlock
SW Front RH
Door Lock Motor Front RH
Door Unlock Detection
SW Front RHD14
Door Lock Motor Rear LH
Door Unlock Detection SW
Rear LHB15
Back Door Lock Motor
Back Door Unlock
Detection SWD15
Door Lock Motor
Rear RH
Door Unlock Detection
SW Rear RH
Passenger Side J/B
Instrument Panel J/B7
P5
16
P5
3
P58
P5 IB21
GR Y5
IF3O6
B10 MPX1
10
B9
11
B10
17
B12MPX2
LSWP
LSWA LSSR
E1
2BR
LGBR
3
IA1
15
BH1B
BR7
BC1
GR
4
LSSR
E V
4
S
E
3 8
BG3 B A
AA A
BB
B J12
J/C
BB1 6
1GR
LSSR
E LSSR
E
56 BRIN22
W-B2
IN1W-B
IAW-B4L 10
4M6
14
1D4
1EW-BW-B
BB1
11
W-B
BAJ14
J/CA
BE13 BC1W-B
BB MPX1
MPX2
LSW
LSWE
23
W-B
W-B 05-1604
- DIAGNOSTICSLIGHTING SYSTEM
1794 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DOOR LOCK POSITION CIRCUIT
CIRCUIT DESCRIPTION
This circuit detects the state of the door lock detection sensor and sends it to the multiplex network body
ECU.
WIRING DIAGRAM
05IQF-02
Page 1347 of 2572

E74383
P5
Power Window Master SW with ECU
Connector Front View:
E74263
Multiplex Network Body ECU
Connector Front View:
B12B10
B12-17B10-1 1
- DIAGNOSTICSLIGHTING SYSTEM
05-1605
1795 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
HINT:
Inspect if the door lock system is normal before performing this procedure.
1 CHECK HARNESS AND CONNECTOR(FRONT DOOR LOCK POSITION CIRCUIT)
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
P5-3 - P5-16Driver side door is locked.10 to 14 V
P5-3 - P5-16Driver side door is
unlocked.Below 1 V
NG GO TO POWER DOOR LOCK CONTROL
SYSTEM (SEE PAGE 05-1935)
OK
2 CHECK HARNESS AND CONNECTOR(PASSENGER AND REAR DOOR LOCK
POSITION CIRCUIT)
(a) Measure the voltage according to the value(s) in the table below.
Standard:
Tester connectionConditionSpecified condition
B10-1 1 - Body groundPassenger side door is locked.
Passenger side door is unlocked.10 to 14 V
Below 1 V
B12-17 - Body groundRear doors and back door are locked.
One of the rear doors or back door is unlocked.10 to 14 V
Below 1 V
NG GO TO POWER DOOR LOCK CONTROL
SYSTEM (SEE PAGE 05-1935)
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
(SEE PAGE 05-1538)
Page 1348 of 2572
I40822
To Multiplex Network
Body ECU
To HEAD Relay Headlamp LH (Hi) Headlamp RH (Hi) DRL No.2 Relay
DRL No.3 Relay
DRL No.4
Relay When Daytime Running Light
System is Operated: 05-1562
- DIAGNOSTICSLIGHTING SYSTEM
1752 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DRL RELAY CIRCUIT
CIRCUIT DESCRIPTION
The multiplex network body ECU controls DRL No.2, No.3 and No.4 relays.
The headlamp (High) is connected in serial when the daytime running light system operates.
05ETR-02
Page 1349 of 2572
I40823
To Multiplex Network
Body ECU
To HEAD Relay Headlamp LH (Hi) Headlamp RH (Hi) DRL No.2 Relay
DRL No.3 Relay
DRL No.4
Relay When HI Beam or Flash is
Operated:
- DIAGNOSTICSLIGHTING SYSTEM
05-1563
1753 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
The headlamp (High) is connected in parallel when the HI BEAM or FLASH operates.
Page 1350 of 2572
E74077
Engine Room R/B No.3
Body ECU
Engine Room R/B
H4
Headlamp RH (Low Beam)
H3
Headlamp RH (High Beam)H2
Headlamp LH (Low Beam)
H1
Headlamp LH (High Beam)Engine Room R/B No.3
DRL No.4 Relay
Engine Room J/B
H-LP RH UPR H-LP LH UPR
HEAD LAMP RelayDRL No.3 Relay DRL No.2 Relay
HRLY
DRL
MAIN
FL MAIN Battery R-B R-B
R-B
L-W
L-W
L-Y
R-W
R-WW-BL-R
R-Y
R-W
W-B
W-B
W-B
R-W
W-B
J1
J/C J3
J/C
W
13WEB EA EG F7
FL BlockA A16
IK3B2
B11
1
2I1
2BP
1 2 2
3 1
4 5
2F
4
2G2
2F 1
2R32
15 3
3
3 3 1
212
R-L31
2 12 222
12 IK34
R
B113
H-LP RH LWR H-LP LH LWR B
B
B 3
3
3
3
31
3
2
1
53
3
3
3
3 2
5
1
2
3
4 DRL 05-1564
- DIAGNOSTICSLIGHTING SYSTEM
1754 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
WIRING DIAGRAM
Page 1351 of 2572

E74263
B11
B11-3 Multiplex Network Body ECU
Connector Front View:
- DIAGNOSTICSLIGHTING SYSTEM
05-1565
1755 Author: Date:
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 (low) comes on.
BODY NO.1 (MULTIPLEX NETWORK BODY ECU):
ItemTest DetailsDiagnostic Note
DIMMER SIGDRL No.2 relay ON/OFF-
OK: Headlamp (high) 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 (low) comes on.
NG Go to step 5
OK
Page 1352 of 2572
E74263
B11
B11-2 Multiplex Network Body ECU
Connector Front View:
05-1566
- DIAGNOSTICSLIGHTING SYSTEM
1756 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 INSPECT MULTIPLEX NETWORK BODY ECU
(a) Using a service wire, connect B11-2 of the wire harness side and body ground.
OK: Headlamp (high) comes on (decrease mode).
NG Go to step 7
OK