2001 TOYOTA SEQUOIA running lights

± DIAGNOSTICSENGINE
DI±285
479 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air±fuel ratio was lean or rich, as well as other
data from the time when a malfunction occurred.
1 Check operation of stop light.
CHECK:
Check if the stop lights come on and go off normally when the brake pedal is operated and released.
NG Check and repair stop light circuit.
OK
2 Check stop light switch (See page BE±47).
NG Replace stop light switch.
OK

± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1615
1809 Author: Date:
2005 SEQUOIA (RM1146U) Seat belt warning lamp for driver's seat does not operate.
Refer to troubleshooting proceduresDI±1650
SLIP warning light does not come on.
1. SLIP warning light circuit
2. Wire harness and connector
3. Combination meter assy
4. Skid control ECUDI±1041
±
IN±35
IN±35
INDICATOR LIGHTS:
SymptomSuspected AreaSee page
Turn indicator light does not come on.
1. Turn signal flasher relay
2. Wire harness or connector
3. Combination meter assyBE±36
±
IN±35
High beam indicator light does not come on.
1. Headlight dimmer switch (*1)
Headlight dimmer switch circuit (*2)
2. Wire harness or connector
3. Combination meter assyBE±27
DI±1755
±
IN±35
Washer level indicator light does not come on.
1. Washer level warning switch
2. Wire harness or connector
3. Combination meter assyBE±49
±
IN±35
Tire pressure indicator light does not come on.
1. Tire pressure monitor ECU
2. Wire harness or connector
3. Combination meter assyDI±873
±
IN±35
CRUISE main indicator light does not come on.
1. CRUISE main indicator light circuit
2. Cruise main control switch circuit
3. Wire harness or connector
4. Combination meter assyDI±1557
DI±1561
±
IN±35
VSC OFF indicator light does not come on.1. VSC OFF indicator light circuit
2. Combination meter assyDI±1048
IN±35
VSC TRAC indicator light does not come on.1. VSC TRAC indicator light circuit
2. Combination meter assyDI±1027
IN±35
Security indicator light does not come on.1. Security indicator light circuit
2. Combination meter assyDI±1731
IN±35
4HI indicator light does not come on.
1. Wire harness and connector
2. Combination meter assy
3. 4WD control ECU±
IN±35
IN±35
4LO indicator light does not come on.
1. Wire harness and connector
2. Combination meter assy
3. 4WD control ECU±
IN±35
IN±35
CTR DIF LOCK indicator light does not come on.
1. Wire harness and connector
2. Combination meter assy
3. 4WD control ECU±
IN±35
IN±35
Height control indicator lamp does not come on.1. Height control indicator lamp circuit
2. Combination meter assyDI±785
IN±35
Height control manual indicator lamp does not come on.1. Height control manual indicator lamp circuit
2. Combination meter assyDI±789
IN±35
A/T indicator light does not come on.
1. Park/neutral position switch circuit
2. Wire harness and connector
3. Combination meter assyDI±576
±
IN±35
*1: w/o Day time running light
*2: w/ Day time running light
OTHERS:
SymptomSuspected AreaSee page
All buzzers (key reminder, seat belt) do not operate.Combination meter assyIN±35

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1687
1881 Author: Date:
2005 SEQUOIA (RM1146U)
WIRELESS DOOR LOCK CONTROL
SymptomSuspected AreaSee page
All functions of wireless door lock control system do not operate.
1. Transmitter
2. Wireless door lock receiver circuit
3. Key unlock warning switch circuit
4. Body ECUBE±99
DI±1737
DI±1715
IN±35
Lock (or unlock) function does not operate.
1. Door unlock detection switch circuit (Driver's)
(Passenger's)
(Rear Door)
(Back Door)
2. Any door ECU
3. Body ECUDI±1791
DI±1829
DI±1723
DI±1869
IN±35
IN±35
Automatic lock function operates even if any door is opened within
30 seconds after all doors are unlocked by wireless door lock
control system.1. Door courtesy light switch circuit
2. Any door ECU
3. Body ECUDI±1728
IN±35
IN±35
Wireless door lock function operates, but the buzzer does not
sound.1. Wireless door lock buzzer circuit
2. Body ECUDI±1741
IN±35
Buzzer sounds, but wireless door lock function does not operate.Body ECUIN±35
REAR WIPER AND WASHER
SymptomSuspected AreaSee page
Rear wiper does not operate.1. Rear wiper switch and motor circuit
2. Body ECUDI±1704
IN±35
Rear washer does not operate.1. Rear washer switch and motor circuit
2. Body ECUDI±1704
IN±35
LIGHT CONTROL
SymptomSuspected AreaSee page
Automatic light control does not operate.
1. Automatic light control sensor circuit
2. Light control switch circuit
3. Body ECUDI±1753
DI±1750
IN±35
Auto turn±off does not operate.
1. Door courtesy light switch circuit (Driver side)
2. Ignition switch
3. Driver door ECU
4. Body ECUDI±1728
BE±24
IN±35
IN±35
Daytime running light function does not operate.
1. Daytime running light relay circuit
2. Parking brake switch circuit
3. Body ECUDI±1712
DI±1744
IN±35
FOG LIGHT
SymptomSuspected AreaSee page
Fog lights do not come on.
1. Bulb
2. FOG fuse
3. Fog light relay and switch circuit
4. Body ECU±
BE±14
DI±1710
IN±35
OTHERS
SymptomSuspected AreaSee page
Illuminated entry function does not operate.1. Illumination circuit
2. Body ECUDI±1759
IN±35
All functions of the body control system do not operate.1. Power source circuit
2. Body ECUDI±1700
IN±35
Remote control mirror does not operate.
(w/ Driving position memory)1. Remote control mirror switch circuit
2. Driving position memory switch circuit
3. Body ECUDI±1767
DI±1772
IN±35

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

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

I28521
1B
1B1
2
7
1B 1F9Y±R
B6
B6 11
8
R±L Instrument Panel J/B
Y±R
W±BHF HU
J8
J/C A
IE16 LOW
HIGH
FLASH Headlight
Dimmer
Switch
W±BC8 Combination Switch
EL HF HU87Body ECU w/ Daytime Running Light:
± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1755
1949 Author: Date:
2005 SEQUOIA (RM1146U)
Headlight dimmer switch circuit
CIRCUIT DESCRIPTION
This circuit detects the headlight dimmer switch condition.
w/ daytime running light:
The body ECU detects the headlight dimmer switch position and turns on the DIMMER relay.
The body ECU informs the combination meter of the headlight dimmer switch condition via BEAN.
When the headlight dimmer switch position is HI or FLASH, the HI beam indicator light on the combination
meter comes on.
w/o daytime running light:
When the headlight dimmer switch position is HI or FLASH, the HI beam indicator light on the combination
meter comes on.
When the HI beam headlights come on, current is supplied to the HI beam indicator light on the combination
meter to turn the indicator light on.
WIRING DIAGRAM
DI94U±08

CH±4
± CHARGINGCHARGING SYSTEM
2896 Author: Date:
2005 SEQUOIA (RM1146U)
If the voltmeter reading is more than the standard voltage, re-
place the voltage regulator.
If the voltmeter reading is less than the standard voltage, check
the voltage regulator and generator.
10. INSPECT CHARGING CIRCUIT WITH LOAD
(a) With the engine running at 2,000 rpm, turn on the high
beam headlights and set the heater blower switch to HI.
(b) Check the reading on the ammeter.
Standard amperage: 30 A or more
If the ammeter reading is less than the standard amperage, re-
pair the generator.
HINT:
If the battery is fully charged, the indication will sometimes be
less than standard amperage.
11. REINSTALL ENGINE UNDER COVER