2001 TOYOTA HIGHLANDER relay

A87797
Wire Harness Side
V5
VSV for ACM
E9
ECM
ACM
A85448
A90291A92392
Wire Harness Side
V5
VSV for ACM
EFI Relay
Engine Room J/B
05-672
- DIAGNOSTICSSFI SYSTEM (3MZ-FE)
862 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
5 CHECK WIRE HARNESS (VSV FOR ACM - ECM, VSV FOR ACM - EFI RELAY)
(a) Check the wire harness between the VSV and ECM.
(1) Disconnect the V5 VSV connector for ACM.
(2) Disconnect the E9 ECM connector.
(3) Check the resistance of the wire harness side con-
nectors.
Standard:
Tester ConnectionSpecified Condition
V5-2 - E9-6 (ACM)Below 1 W
V5-2 or E9-6 (ACM) - Body ground10 kW or higher
(b) Check the wire harness between the VSV and EFI relay.
(1) Disconnect the V5 VSV connector.
(2) Remove the EFI relay from the engine room J/B.
(3) Check the resistance of the wire harness side con-
nectors.
Standard:
Tester ConnectionSpecified Condition
V5-1 (VSV for ACM) - J/B EFI relay terminal 3Below 1 W
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE ECM (See page 10-24)

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

I40666
ON (Below 1.0 W) Low pressure side High pressure side
OFF
(10 kW or higher)OFF
(10 kW or higher) (2.0 kgfVcm
2, 28 psi) (32.0 kgfVcm2, 455 psi) 196 KPa 3,140 KPa
I41168
HP E61ECM
IK32
L G
1 A3
Pressure Switch
4
A
EH J2
J/CW-B
Dual
- DIAGNOSTICSAIR CONDITIONING SYSTEM
05-1 149
1339 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1423/23 PRESSURE SWITCH CIRCUIT
CIRCUIT DESCRIPTION
The ECM and A/C amplifier communicate via BEAN.
The pressure switch sends the appropriate signals to the A/C
amplifier when the A/C refrigerant pressure drops too low or
rises too high. When the A/C amplifier receives these signals,
it outputs signals through the A/C amplifier to turn the magnet
clutch relay off and turns the magnetic clutch off.
DTC No.Detection ItemTrouble Area
B1423/23

Open in pressure sensor circuit.

Abnormal refrigerant pressure.
below 196 kPa (2.0 kg/cm
2, 28 psi)
over 3,140 kPa (32.0 kgf/cm2, 455 psi)

Pressure switch

Harness or connector between cooler refrigerant liquid pipe A
(pressure switch) and ECM

Multiplex communication circuit

Refrigerant pipe line

ECM

A/C amplifier assy
WIRING DIAGRAM
05ITX-02

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

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.

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

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

05-1574
- DIAGNOSTICSLIGHTING SYSTEM
1764 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TAIL RELAY CIRCUIT
CIRCUIT DESCRIPTION
The multiplex network body ECU controls the TAIL relay when a signal is received from the headlamp dim-
mer switch assy.
05IQA-01