2001 TOYOTA SEQUOIA lights

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1689
1883 Author: Date:
2005 SEQUOIA (RM1146U) PCTY ± GND1
(B5±22 ± B6±6)
LG±B ± W±BCourtesy light switch
(Front RH)Passenger door courtesy light
switch OFF (Closed)10 to 14 V
LSWL ± GND1
(B7±24 ± B6±6)P±L ± W±BDoor unlock detection
switch (Rear LH)Rear LH door unlock detection
switch ON (Unlocked)Below 1 V
LSWL ± GND1
(B7±24 ± B6±6)P±L ± W±BDoor unlock detection
switch (Rear LH)Rear LH door unlock detection
switch OFF (Locked)10 to 14 V
DCTY ± GND1
(B7±12 ± B6±6)GR±R ± W±BCourtesy light switch
(Front LH)Driver door courtesy light switch
ON (Open)Below 1 V
DCTY ± GND1
(B7±12 ± B6±6)GR±R ± W±BCourtesy light switch
(Front LH)Driver door courtesy light switch
OFF (Closed)10 to 14 V
LSWR ± GND1
(B5±21 ± B6±6)P±B ± W±BDoor unlock detection
switch (Rear RH)Rear RH door unlock detection
switch ON (Unlocked)Below 1 V
LSWR ± GND1
(B5±21 ± B6±6)P±B ± W±BDoor unlock detection
switch (Rear RH)Rear RH door unlock detection
switch OFF (Locked)10 to 14 V
HORN ± GND1
(B5±26 ± B6±6)B±Y ± W±BHorn switch signalHorn switch OFF10 to 14 V
HORN ± GND1
(B5±26 ± B6±6)B±Y ± W±BHorn switch signalHorn switch ONBelow 1 V
BDR ± GND1
(B6±2 ± B6±6)L±W ± W±BBatteryAlways10 to 14 V
GND1 ± Body ground
(B6±6 ± Body ground)W±B ± Body groundGroundAlwaysBelow 1 V
RWLS ± GND1
(B5±6 ± B6±6)Y±B ± W±BRear wiper switch sig-
nal (ON)Rear wiper switch ONBelow 1 V
RWLS ± GND1
(B5±6 ± B6±6)Y±B ± W±BRear wiper switch sig-
nal (ON)Rear wiper switch OFF or INT10 to 14 V
RWC1 ± GND1
(B5±7 ± B6±6)G±B ± W±BRear wiper switch sig-
nal (INT)Rear wiper switch INTBelow 1 V
RWC1 ± GND1
(B5±7 ± B6±6)G±B ± W±BRear wiper switch sig-
nal (INT)Rear wiper switch OFF10 to 14 V
ACTD ± GND1
(B7±2 ± B6±6)R±B ± W±BDoor lock motor (Front
LH)Power door lock not operating or
operating to UNLOCKBelow 1 V
ACTD ± GND1
(B7±2 ± B6±6)R±B ± W±BDoor lock motor (Front
LH)Power door lock not operating to
LOCK10 to 14 V
IND ± GND1
(B5±16 ± B6±6)GR ± W±BSecurity indicator lightSecurity indicator is offBelow 1 V
IND ± GND1
(B5±16 ± B6±6)GR ± W±BSecurity indicator lightSecurity indicator light is on10 to 14 V
SH ± GND1
(B7±1 ± B6±6)R±G ± W±BTheft deterrent horn
signalSecurity horn does not soundBelow 1 V
SH ± GND1
(B7±1 ± B6±6)R±G ± W±BTheft deterrent horn
signalSecurity horn sounds10 to 14 V
HRLY ± GND1
(B7±8 ± B6±6)LG±R ± W±BHEAD relay signalHEAD relay ONBelow 1 V
HRLY ± GND1
(B7±8 ± B6±6)LG±R ± W±BHEAD relay signalHEAD relay OFF10 to 14 V
TRLY ± GND1
(B7±11 ± B6±6)LG ± W±BTaillight relay signalTaillight relay ONBelow 1 V
TRLY ± GND1
(B7±11 ± B6±6)LG ± W±BTaillight relay signalTaillight relay OFF10 to 14 V

I24351
Body ECU
11 3
21 5
B 5W
1G TAILLIGHT Relay
To Taillight
F10
Fusible Link BlockLG
B7
ALTTRLY 2 1L
81
BatteryInstrument Panel J/B
LG
DDJ/9
J/C DI±1706
± DIAGNOSTICSBODY CONTROL SYSTEM
1900 Author: Date:
2005 SEQUOIA (RM1146U)
Taillight Relay Circuit
CIRCUIT DESCRIPTION
TAILLIGHT relay will be ºONº by operating the light control switch. The transistor which activates the tail light
relay has two sorts: one is activated by the light control switch for fail safe and the other is activated by CPU.
When the theft deterrent system is activated, it causes the transistor in the ECU to switch ON and OFF at
approximately 0.4 sec. intervals. This switches the TAILLIGHT relay ON and OFF, and thus flashing the tail-
lights (See the wiring diagram below).
In this condition, if any of the following operations is done, the transistor in the ECU goes OFF and the TAIL-
LIGHT relay switches OFF, and thus stopping the taillights flashing:
(1) Unlock the front LH or RH door with a key.
(2) Turn the ignition switch to ACC or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
WIRING DIAGRAM
DI6QY±15

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1707
1901 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
When using the hand±held tester, start the inspection from step 1 and when not using the hand±held tester,
start from step 2.
1 Check TAILLIGHT relay using hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON.
CHECK:
According to the display on the tester, perform the ºACTIVE TESTº.
BODY ECU:
ItemTest DetailsDiagnostic Note
TAIL LIGHTTaillight ON/OFF±
OK:
The taillights turn on or off correctly when operating them through the hand±held tester.
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1686).
NG
2 Check TAILLIGHT relay (See page BE±27).
NG Replace TAILLIGHT relay.
OK
3 Check wire harness and connector between TAILLIGHT relay and body ECU, bat-
tery and TAILLIGHT relay (See page IN±35).
NG Repair or replace wire harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table
(See page DI±1686).

I24144
Body ECU
MAINEngine Room J/B
HEAD Relay
Instrument Panel J/B
Battery
LG±R 2D
B12FL
R±W
12 532F
2G
2C
B7 1G 1JL
R±L
R±L
HRLY 8
6
1
6
1
2
(*1): w/ Daytime Running Light
(*2): w/o Daytime Running LightLG±R69 8 To Headlight RH To Headlight LH To DRL No.4 Relay To DIMMER Relay To DIMMER Relay
B 4
5 F10
FL Block(*2) (*2) (*1)
(*1)
(*1)
H±LP RH (*2)
DRL (*1)
H±LP LH (*2)
(*1) DI±1708
± DIAGNOSTICSBODY CONTROL SYSTEM
1902 Author: Date:
2005 SEQUOIA (RM1146U)
Headlight Relay Circuit
CIRCUIT DESCRIPTION
HEAD relay will be ºONº by operating the light control switch. The transistor which activates the HEAD relay
has two sorts: one is activated by the light control switch for fail safe and the other is activated by CPU. The
one that is activated by CPU prevents the headlight from turning off at the time of trouble with the other sys-
tem in the automatic operation circuit.
When the theft deterrent system is activated, it causes the transistor in the ECU to switch ON and OFF at
approximately 0.25 sec. intervals. This switches the HEAD relay ON and OFF, and thus flashing the head-
lights (See the wiring diagram below).
In this condition, if any of the following operations is done, the transistor in the ECU goes OFF and the HEAD
control relay switches OFF, and thus stopping the headlights flashing:
(1) Unlock the front LH or RH door with a key.
(2) Turn the ignition switch to ACC or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
WIRING DIAGRAM
DI5VQ±14

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1709
1903 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
When using the hand±held tester, start the inspection from step 1 and when not using the hand±held tester,
start from step 2.
1 Check HEAD relay using hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON.
CHECK:
According to the display on the tester, perform the ºACTIVE TESTº.
BODY ECU:
ItemTest DetailsDiagnostic Note
HEAD LIGHTHeadlight relay ON/OFF±
OK:
The headlights turn on or off correctly when operating them through the hand±held tester.
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1686).
NG
2 Check HEAD relay (See page BE±27).
NG Replace HEAD relay.
OK
3 Check wire harness and connector between HEAD relay and body ECU, battery
and HEAD relay (See page IN±35).
NG Repair or replace wire harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table
(See page DI±1686).

I28516
J5
J/CBody ECU
FFOG J50
J/C J3
J/C
5 Instrument Panel J/B
From DIMMER Relay (*1) FOG LIGHT Relay
FOG
1K7
1B9
1J10 1L1
3
1 2 D
D
D
1
2F2
Front Fog
Light RH
W±B
B 1
2P
W±B
EDIGALTF10
FL Block 8
5
B
BatteryR±W
C8 Combination Switch

Fog Light Switch
B613
G±B
10
LFG BFG 11 P
F1
Front Fog
Light LH
G±W (*1)
Y±R (*2) WP
A
(*1): w/ Daytime Running Light
(*2): w/o Daytime Running LightB
J2
J/C B
BW±B
J18
J/C W±B W±B
IL1
From Headlight (*2) 16
A DI±1710
± DIAGNOSTICSBODY CONTROL SYSTEM
1904 Author: Date:
2005 SEQUOIA (RM1146U)
Front fog light relay and switch circuit
CIRCUIT DESCRIPTION
The fog light switch is built into the combination switch.
Turning the fog light switch ON supplies power to terminal FFOG of the body ECU.
The fog lights come on when the FOG light relay is turned on.
WIRING DIAGRAM
DI6U4±14

DI±1712
± DIAGNOSTICSBODY CONTROL SYSTEM
1906 Author: Date:
2005 SEQUOIA (RM1146U)
Daytime running light relay circuit
CIRCUIT DESCRIPTION
Power is supplied to the DIMMER and DRL No. 4 relays when the HEAD relay is turned on.
The HEAD relay turns on by turning the light control switch to the TAIL or HEAD position.
The DIMMER relay turns on by turning the headlight dimmer switch to the LOW, HIGH, or FLASH position.
The body ECU determines the light control switch position and turns on the DRL No. 4 and DIMMER relays.
The DRL No. 4 relay and the daytime running light resistor are parallel circuits. If the light control switch is
OFF, electric current flows to body ground via the resistor instead of driving the DRL No. 4 relay. The head-
lights come on and dim according to the amount of resistance.
DI6M3±11

I18747
Body ECU
Instrument Panel J/BHEAD
TAIL
A G±Y
G
L±R (*1)B6
137 9
H
TELA
OFF
TAIL
HEAD
AUTO Light
Control
Switch
16
W±B
1B7 9
1F J8
J/C
W±B
A
IE10
14 12
(*1): w/ Automatic Light ControlB6
B6
C8
Combination Switch DI±1750
± DIAGNOSTICSBODY CONTROL SYSTEM
1944 Author: Date:
2005 SEQUOIA (RM1146U)
Light control switch circuit
CIRCUIT DESCRIPTION
The body ECU detects the light control switch position and drives the DRL No. 4 and HEAD relays.
If the vehicle is equipped with an automatic light control system, the light control switch includes the AUTO
position.
The body ECU turns the headlights ON and OFF based on the ambient light level outside the vehicle, which
is detected by the automatic light control sensor.
WIRING DIAGRAM
DI1OL±27