2001 TOYOTA SEQUOIA wiring manual

B17411
ECM Connector
E1AIDI
A16555
AIR INJ CHECK
AIR PUMP............................ON
EASV ............................OPEN
ASV1. .............................OPEN
ASV2...............................OPEN
A/F BANK1.......................19.05
A/F BANK2.......................19.05
PRESSURE....................17 kPa
PULSATION..............25.39 kPa
AI STATUS...........................OK
Remaining Time 05 sec.
Press [EXIT] to quit
± DIAGNOSTICSENGINE
DI±345
539 Author: Date:
2005 SEQUOIA (RM1146U) Case 3:
Diagnostic signal duty ratio from air injection driver0 %
Case 4:
Diagnostic signal duty ratio from air injection driver100 %
COMPONENT OPERATING RANGE
ParameterStandard Value
Diagnostic signal duty ratio from air injection driver
70 to 90% when secondary air injection system operating
and
0% when secondary air injection system not operating
WIRING DIAGRAM
Refer to DTC P0412 on page DI±234.
INSPECTION PROCEDURE
HINT:
The diagnostic information output from the AID can be confirmed by connecting an oscilloscope to the diag-
nostic information terminal of the AID. It narrows a trouble area search to read the waveform on the oscillo-
scope when performing the AI system intrusive operation function provided in the SYSTEM CHECK.
(a) Start the engine and warm it up.
(b) Turn the ignition switch to OFF.
(c) Connect a hand±held tester to the DLC3.
(d) Connect an oscilloscope probe to the AIDI terminal of the
ECM.
(e) Start the engine and turn the tester ON.
(f) On the tester, select the following menu items:
DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK /
AIR INJ SYSTEM.
(g) On the tester, select the following menu items:
DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK /
AIR INJ CHECK / MANUAL OPERATION / OPERATION
1 and 2.
HINT:
OPERATION 1: AP: OFF, EASV:CLOSE, ASV1:CLOSE,
ASV2:OFF
OPERATION 2: AP: ON, EASV:OPEN, ASV1:OPEN,
ASV2:OPEN

DIDD3±01
F16803
S25
DI±718
± DIAGNOSTICSAIR SUSPENSION SYSTEM
912 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECU
Symbols (Terminal No.)Wiring ColorTerminal
DescriptionConditionSpecified Condition
SLEX (S25±1) ± LR WB
Exhaust Sole-
id V l Si
IG switch ON "
E i idli b tt f h i ht t l it h i h dBelow 1.0 V "SLEX (S25 1)
GND (S25±22)L±R ± W±Bnoid Valve Sig-
nalEngine idling, button of height control switch is pushed
from ºUPº to ºDOWNºBelow 1.0 V "
9 V or more
SLRR (S25±3) ± LG R W B
Leveling Sole-
id V l Si
IG switch ON "
E i idli b tt f h i ht t l it h i h dBelow 1.0 V "SLRR (S25 3)
GND (S25±22)LG±R ± W±Bnoid Valve Sig-
nalEngine idling, button of height control switch is pushed
from ºDOWNº to ºUPºBelow 1.0 V "
9 V or more
SLRL (S25±4) ± WL WBGate SolenoidIG switch ON "
E i idli b tt f h i ht t l it h i h dBelow 1.0 V "SLRL (S25 4)
GND (S25±22)W±L ± W±BGate Solenoid
Valve SignalEngine idling, button of height control switch is pushed
from ºDOWNº to ºUPºBelow 1.0 V "
9 V or more
RC (S25±5) ± GY WBAIR SUS RelayIG switch ON "
E i idli b tt f h i ht t l it h i h dBelow 1.0 V "RC (S25 5)
GND (S25±22)G±Y ± W±BAIR SUS Relay
SignalEngine idling, button of height control switch is pushed
from ºNº to ºUPºBelow 1.0 V "
9 V or more
HI (S25±8) ± GR R W B
Height Control
I di t ºHIº
Engine idling, vehicle height is ºNORMALº "
P i th ºUPº b tt f th t l it h t10 V or more "HI (S25 8)
GND (S25±22)GR±R ± W±BIndicator ºHIº
SignalPressing the ºUPº button of the control switch turns on
the ºHIº indicator lamp (*1)10 V or more "
Below 5 V
NR (S25±9) ± BL WB
Height Control
I di t ºNº
Engine idling, vehicle height is ºNORMALº "
P i th ºUPº b tt f th t l it h tBelow 5 V "NR (S25 9)
GND (S25±22)B±L ± W±BIndicator ºNº
SignalPressing the ºUPº button of the control switch turns on
the ºHIº indicator lamp (*1)Below 5 V "
10 V or more
IG (S25±10) ±
GND (S25±22)B±R ± W±BIgnition SwitchIG switch ON10 to 14 V
VN (S25±11) ± LG W B
Height Control
MlIdi
IG switch ON, height control manual indicator lamp ON
" Pressin
g and releasing the height control mode selectBelow 5 V "VN (S25 11)
GND (S25±22)LG ± W±BManual Indica-
tor Lamp Signal" Pressing and releasing the height control mode select
switch turns off the height control manual indicator lamp
(*1)
Below 5 V "
10 V or more
TD (S25±12) ± BR B W B
Height Control
Md Sl t
IG switch ON, height control mode select switch pushed
iBelow 1.5 V "TD (S25 12)
GND (S25±22)BR±B ± W±BMode Select
Switchin
" Height control select switch releasedBelow 1.5 V "
10 to 14 V
UPSW (S25±13) ± LB WB
Height Control
S it h ºUPº
IG switch ON, ºUPº button of height control switch
hdiBelow 1.5 V "UPSW (S25 13)
GND (S25±22)L±B ± W±BSwitch ºUPº
Signalpushed in "
ºUPº button of height control switch releasedBelow 1.5 V "
10 to 14 V
SBL (S25±15) ±
SGL (S25±19)G±O ± L±R
Height Control
Sensor Power
Source
IG switch ON4.5 to 5.5 V
SHRL (S25±17) ± GR L L R
Height Control
SIt
IG switch ON "
E i idli hi l h i ht i h d f ºHIGHº t0.5 to 4.5 V "SHRL (S25 17)
SGL (S25±19)GR±L ± L±RSensor Input
SignalEngine idling, vehicle height is changed from ºHIGHº to
ºNORMALº by pressing the height control switch0.5 to 4.5 V "
Approx. 2.5 V
SGL (S25±19) ±
GND (S25±22)L±R ± W±BHeight Control
Sensor GroundAlwaysBelow 1.0 V

F19451
C6
Combination
MeterSuspension Control
ECU
I18
Ignition SW
Engine Room J/B Instrument Panel J/B B±O
W±R11
7 1H
1JIGN1
1C
1C32
B±RMAN. 24
13 LG11
S25 VN
5
IG2 AM2 6
W±R
B
Battery 1
2D AM2
2C1
B5 4F10
FL Block
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±789
983 Author: Date:
2005 SEQUOIA (RM1146U)
Height Control Manual Indicator Lamp Circuit
CIRCUIT DESCRIPTION
When manual mode is selected by pressing the height control mode select switch, the manual indicator lamp
comes on. (For the wiring diagram of the height control mode select switch circuit, see page DI±778.) If the
suspension control ECU detects a problem, the height control manual indicator lamp blinks while suspend-
ing the height control function. At the same time, the suspension control ECU records a DTC in the memory.
Connect terminals TC and CG of the DLC3 to make the height control manual indicator lamp blink and output
DTCs.
WIRING DIAGRAM
DIDEN±01

I28449
Position Control
ECU & Switch
SLD± SLD+ FRV± FRV+
LFT± LFT+RCL± RCL+ 2 1
21
21
2 13 M7
M7
M7
M7
M7
M7
M7
M724 6
9 7 108
BR P14
Power Seat Motor
(Driver's Seat Front Vertical Control)
P16
Power Seat Motor
(Driver's Seat Reclining Control)P
V W B G
Y L P15
Power Seat Motor
(Driver 's Seat Rear Vertical Control)
P17
Power Seat Motor
(Driver's Seat Slide Control)
± DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI±1525
1719 Author: Date:
2005 SEQUOIA (RM1146U)
Power seat motor circuit
CIRCUIT DESCRIPTION
When the power seat control switch is operated, a command signal is sent to the position control ECU. The
position control ECU then controls the appropriate seat motor as needed. This memory system does not use
a seat position sensor. The seat position is detected by counting pulses that are output when the motor turns.
If there is no pulse output from the motor, the motor will stop operating. The ECU is designed so that a mal-
function of the seat memory system will not interfere with manual seat control.
When the position control ECU switch assy detects the low motor speed or abnormal activity, the system
stops the motor. When the motor continuously operates for 120 seconds or more, the system will stop the
motor until the switch is turned off.
WIRING DIAGRAM
DIDEB±01

EM1X3±01
D13872
Hand±Held Tester
DLC3
CAN VIM
A23395
DLC3
TA C
SST
± ENGINE MECHANICALIDLE SPEED
EM±11
2590 Author: Date:
2005 SEQUOIA (RM1146U)
IDLE SPEED
INSPECTION
1. INITIAL CONDITIONS
(a) Engine at normal operating temperature
(b) Air cleaner installed
(c) All pipes and hoses of air induction system connected
(d) All accessories switched OFF
(e) All vacuum lines properly connected
(f) SFI system wiring connectors fully plugged
(g) iCorrect gnition timing
(h) Transmission in neutral
(i) Air conditioning switched OFF
2. INSPECT ENGINE IDLE SPEED
(a) When using a hand±held tester.
(1) Connect a hand±held tester to the Controller Area
Network Vehicle Interface Module (CAN VIM). Then
connect the CAN VIM to the Date Link Connector 3
(DLC3).
(2) Please refer to the hand±held tester operator's
manual for further details.
(3) Race the engine speed at 2,500 rpm for approx. 90
seconds.
(4) Check the idle speed.
Idle speed: 700 ± 50 rpm
(Transmission in neutral)
If the idle speed is not as specified, check the air intake system.
(5) Disconnect the hand±held tester and CAN VIM
from the DLC3.
(b) When not using a hand±held tester.
(1) Using SST, connect the tachometer probe to termi-
nal TAC of the DLC3.
SST 09843±18030
(2) Race the engine at 2,500 rpm for approx. 90 se-
conds.
(3) Check the idle speed.
Idle speed: 700 ± 50 rpm
(Transmission in neutral )
If the idle speed is not as specified, check the air intake system.

D13872
Hand±Held Tester
DLC3
CAN VIM
SF12Y±05
B16497
Up
Pulsation
DamperScrew
B16528
SST
(Gauge)
Front
Fuel
Pipe
Gasket SST
(Union)SST
(Adaptor)
± SFIFUEL PUMP
SF±7
2741 Author: Date:
2005 SEQUOIA (RM1146U)
FUEL PUMP
ON±VEHICLE INSPECTION
1. CHECK FUEL PUMP OPERATION
(a) Connect a hand±held tester to the Controller Area Net-
work Vehicle Interface Module (CAN VIM). Then connect
the CAN VIM to the Date Link Connector 3 (DLC3).
(b) Turn the ignition switch ON, and push the hand±held tes-
ter main switch ON.
NOTICE:
Do not start the engine.
(c) Enter the following menus: DIAGNOSIS / ENHANCED
OBDII / ACTIVE TEST / FUEL PUMP / SPD
(d) Please refer to the hand±held tester operator's manual
for further details.
(e) Check that the pulsation damper screw rises when the
fuel pump operates.
If operation is not as specified, check the fusible link, fuses, EFI
main relay, fuel pump, ECM and wiring connections.
(f) Turn the ignition switch off.
(g) Disconnect the hand±held tester and CAN VIM from the
DLC3.
2. CHECK FUEL PRESSURE
(a) Check the battery positive voltage is 12 V or more.
(b) Disconnect the negative (±) terminal cable from the bat-
tery.
(c) Remove the front fuel pipe from the LH delivery pipe. (See
page SF±27)
(d) Install the front fuel pipe and SST (pressure gauge) to the
delivery pipe with the 3 lower gaskets and SST (adaptor).
SST 09268±45014 (09268±41190, 90405±06167)
Torque: 39 N´m (400 kgf´cm, 29 ft´lbf)
(e) Wipe off any splattered gasoline.
(f) Reconnect the negative (±) terminal cable to the battery.
(g) Connect a hand±held tester to the DLC3. (See step 1 in
check fuel pump operation (a) to (e))

RS11D±01
H24331ClawClip
H24332
± SUPPLEMENTAL RESTRAINT SYSTEMSIDE AIRBAG ASSEMBLY (Manual Adjuster Type)
RS±61
3344 Author: Date:
2005 SEQUOIA (RM1146U)
REMOVAL
HINT:

Use the same procedures for the RH side and LH side.

The procedures listed below are for the LH side.
NOTICE:

If the wiring connector of the SRS is disconnected
and the ignition switch is in the ON or ACC position,
DTCs will be recorded.

Never use airbag parts from another vehicle. When
replacing parts, replace them with new ones.
1. PRECAUTION (SEE PAGE RS±1 and RS±3)
2. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
Wait for 90 seconds after disconnecting the cable to prevent the
airbag working.
3. REMOVE SEAT TRACK COVERS
Using a screwdriver, remove the 2 seat track covers.
HINT:
Tape the screwdriver tip before use.
4. REMOVE FRONT SEAT
(a) Remove the 4 bolts.
(b) Disconnect the connectors.
(c) w/ Side airbag:
Disconnect the airbag connector.
(d) Remove the front seat.
NOTICE:
Be careful not to damage the body.
5. REMOVE HEADREST
6. REMOVE SEAT CUSHION OUTER SHIELD
(a) Remove the screw from the seat cushion outer shield.
(b) Using a screwdriver, remove the seat cushion outer
shield.
HINT:
Tape the screwdriver tip before use.
7. REMOVE RECLINING ADJUSTER RELEASE HANDLE
8. REMOVE VERTICAL ADJUSTER HANDLE
(a) Using a screwdriver, remove the vertical adjuster handle
cap.
HINT:
Tape the screwdriver tip before use.

RS0UV±05
RS±104
± SUPPLEMENTAL RESTRAINT SYSTEMSEAT POSITION SENSOR ASSEMBLY
3387 Author: Date:
2005 SEQUOIA (RM1146U)
REMOVAL
NOTICE:

If the wiring connector of the SRS is disconnected
with the ignition switch in the ON position, DTCs will
be recorded.

Never use SRS parts from another vehicle. When re-
placing the parts, replace them with new ones.

Never reuse the seat position sensor assembly if the
airbag has previously deployed in a collision.
1. PRECAUTION (SEE PAGE RS±1 and RS±3)
2. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
Wait for 90 seconds after disconnecting the cable to prevent the
airbag working.
3. Separate type (Manual adjuster):
REMOVE FRONT SEAT ASSEMBLY LH
(SEE PAGE BO±111)
4. Separate type (Manual adjuster):
REMOVE VERTICAL ADJUSTER HANDLE
(SEE PAGE BO±125)
5. Separate type (Manual adjuster):
REMOVE SEAT CUSHION OUTER SHIELD
(SEE PAGE BO±125)
6. Separate type (Power adjuster):
REMOVE FRONT SEAT ASSEMBLY LH
(SEE PAGE BO±111)
7. Separate type (Power adjuster):
REMOVE SLIDE KNOB AND RECLINING KNOB (SEE
PAGE BO±112)
8. Separate type (Power adjuster):
REMOVE SEAT CUSHION LOWER SHIELD, SEAT
CUSHION OUTER SHIELD AND SEAT CUSHION IN-
NER SHIELD (SEE PAGE BO±112)