wire diagram TOYOTA SEQUOIA 2001 Service Repair Manual

V08423 Knock Sensor 1
GRECM
KNK
E1 12
E6
WIRING DIAGRAM
Wiring Diagram
This shows a wiring diagram of the circuit.
Use this diagram together with ELECTRICAL
WIRING DIAGRAM to thoroughly understand the
circuit.
Wire colors are indicated by an alphabetical code.
B = Black, L = Blue, R = Red, BR = Brown,
LG = Light Green, V = Violet, G = Green,
O = Orange, W = White, GR = Gray, P = Pink,
Y = Yellow, SB = Sky Blue
The first letter indicates the basic wire color and
the second letter indicates the color of the stripe.
DTC P0325Knock Sensor 1 Circuit Malfunction
CIRCUIT DESCRIPTION
Knock sensor is fitted to the cylinder block to detect engine knocking. This sensor contains a piezoelectric element which
generates a voltage when it becomes deformed, which occurs when the cylinder block vibrates due to knocking. If engine
knocking occurs, ignition timing is retarded to suppress it.
DTC No. DTC Detecting Condition Trouble Area
P0325No knock sensor 1 signal to ECM with engine speed,
1,200 rpm or more. Open or short in knock sensor1 circuit
 Knock sensor 1 (looseness)
 ECM
If the ECM detects the above diagnosis conditions, it operates the fall safe function in which the corrective retard angle
value is set to the maximum value.
 Diagnostic Trouble Code No. and Detection Item
 Circuit Description
The major role and operation, etc. of the circuit
and its component parts are explained.
 Indicates the diagnostic trouble code, diagnostic
trouble code set parameter and suspect area of
the problem.

± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMSIN±33
33 Author: Date:
2005 SEQUOIA (RM1146U)
6. CIRCUIT INSPECTION
How to read and use each page is shown below.

A23557
ECM A42
Air Pressure Sensor
VC
AIP
E2
E8 E8 E8
2832 23
VC
AIP
E2EB4
EB4
EB4G±B G±B
B±Y
B±Y
G±W
G±W6 5 15 V
B17412
E8
E2AIP VC
B17439
Wire Harness Side:
Pressure Sensor Connector
A42
E2
AIP VC
DI±424
± DIAGNOSTICSENGINE
618 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check for open and short in harness and connector between pressure sensor
and ECM (See page IN±35).
PREPARATION:
(a) Remove the intake manifold (see page EM±36).
(b) Disconnect the A42 pressure sensor connector.
(c) Disconnect the E8 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Standard:
Tester ConnectionSpecified Condition
VC (A42±1) ± VC (E8±23)
AIP (A42±2) ± AIP (E8±32)
E2 (A42±3) ± AIP (E8±28)
Below 1 W
VC (A42±1) or VC (E8±23) ±
Body ground
AIP (A42±2) or AIP (E8±32) ±
Body ground
10 kW or higher
NG Repair or replace harness and connector.
OK

D14174
ECM
SLT+
SLT± E713
12 B±R
G±Y E1 Electronically Controlled
Transmission Solenoid
E7 G
GR14
6 SLT+
SLT±+B
1
152 3 4 5 6 7 8
9 10 11 12
13 14
D11994
Transmission Wire Side:
(Connector Front View):
E1
SLT±
SLT+
± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±663
857 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check transmission wire.
PREPARATION:
Disconnect the transmission wire connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionSpecified Condition
20C (68F)
14 (SLT+) ± 6 (SLT±)5.0 to 5.6 W
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionSpecified Condition
14 (SLT+) ± Body ground10 kW or higher
6 (SLT±) ± Body ground=
NG Go to step 3.
OK

F19171
Tire Pressure
Monitor ECU Tire Pressure Monitor
Valve Sub±assy Front LH
Tire Pressure Monitor
Valve Sub±assy Rear LH Tire Pressure Monitor
Valve Sub±assy Front RH
Tire Pressure Monitor
Valve Sub±assy Rear RHJ29A
H
J30 3
4
5 BD2
5
1
4 +5V
RDA
GNDL
V
BR±R T19
Tire Pressure
Monitor Receiver
BD2
BD2L
VL
RF5V
RDA
GND2
Tire Pressure Monitor
Valve Sub±assy SpareJ29C J29B
I
J30
J
J30 BR±RBR±R J/C
T178
T177
T1716 V
: Radio Signal
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±835
1029 Author: Date:
2005 SEQUOIA (RM1146U)
CIRCUIT DESCRIPTION
The tire pressure monitor valve sub±assy constantly sends radio waves to the tire pressure monitor receiver
assy. If the battery for the tire pressure monitor valve sub±assy is depleted, or if the tire pressure monitor
receiver assy is defective or comes off, the DTC will be output. DTCs C2121/21 to C2125/25 can only be
deleted by the tester. DTCs C2181/81 to C2185/85 can be deleted when the transmitter sends a force trans-
mission signal or the test mode ends. DTCs C2181/81 to C2185/85 are output only in the test mode.
DTC No.DTC Detecting ConditionTrouble Area
C2121/21
C2122/22
C2123/23
C2124/24
C2125/25A DTC is detected when the ECU receives no signals for
51 minutes or more, the vehicle speed is 5 mph (8 km/h) or
higher, and the ECU receives no signals for 12 minutes or
more.
Tire pressure monitor receiver assy

Each tire pressure monitor valve sub±assy

Tire pressure monitor ECU

Wire harness
C2181/81
C2182/82
C2183/83
C2184/84
C2185/85
Malfunction in the transmitting/receiving circuit

Tire pressure monitor receiver assy

Each tire pressure monitor valve sub±assy

Tire pressure monitor ECU

Wire harness
HINT:
It is necessary to perform the procedure to identify the tire pressure monitor valve sub±assy that is malfunc-
tioning because it cannot be identified by the output DTC.
WIRING DIAGRAM

F19792
Combination Meter
Tire Pressure Monitor ECU
To BatterySPD G±O3
T17 C520
IEInstrument Panel J/BG±O
J8
J/C
AIF 10
1
1H11
T17GND
IG W±B W±B
T17 J17
J/C
BB
2 DI±870
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1064 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C2191/91 Vehicle Speed Signal Error
CIRCUIT DESCRIPTION
The tire pressure monitor ECU receives a speed signal from the combination meter. This DTC is stored upon
entering test mode but erased when a vehicle speed signal of 12 mph (20 km/h) is detected for 3 seconds
or more. The DTC is output only in test mode.
DTC No.DTC Detecting ConditionTrouble Area
C2191/91Speed sensor circuit malfunction.

Vehicle speed sensor

Combination meter assy

Tire pressure monitor ECU

Wire harness
WIRING DIAGRAM
DIDKE±01

H02750
Airbag Sensor Assembly
A20+SR 29
IL31
IL32
A2027 A12
Front Airbag Sensor RH
2
1±SR W
W
BB +SR
±SR DI±1162
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1356 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1610/13 Front Airbag Sensor RH Malfunction
CIRCUIT DESCRIPTION
The front airbag sensor RH consists of the diagnosis circuit, the frontal deceleration sensor, etc.
If the airbag sensor assembly receives signals from the frontal deceleration sensor, it determines whether
or not the SRS should be activated.
DTC B1610/13 is recorded when a malfunction is detected in the front airbag sensor RH circuit.
DTC No.DTC Detection ConditionTrouble Area
B1610/13

The airbag sensor assembly receives a line short circuit
signal, an open circuit signal, a short circuit to ground sig-
nal or a short circuit to B+ signal in the front airbag sensor
RH circuit for 2 seconds.

Front airbag sensor RH malfunction

Airbag sensor assembly malfunction

Front airbag sensor RH

Airbag sensor assembly

Cowl wire

Engine room main wire
WIRING DIAGRAM
DIDGS±01

H02750
Airbag Sensor Assembly
A20+SL 30
IA31
IA32
A2028 A11
Front Airbag Sensor LH
2
1±SL W
W
BB +SL
±SL
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1171
1365 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1615/14 Front Airbag Sensor LH Malfunction
CIRCUIT DESCRIPTION
The front airbag sensor LH consists of the diagnosis circuit, the frontal deceleration sensor, etc.
If the airbag sensor assembly receives signals from the frontal deceleration sensor, it determines whether
or not the SRS should be activated.
DTC B1615/14 is recorded when a malfunction is detected in the front airbag sensor LH circuit.
DTC No.DTC Detection ConditionTrouble Area
B1615/14

The airbag sensor assembly receives a line short circuit
signal, an open circuit signal, a short circuit to ground sig-
nal or a short circuit to B+ signal in the front airbag sensor
LH circuit for 2 seconds.

Front airbag sensor LH malfunction

Airbag sensor assembly malfunction

Front airbag sensor LH

Airbag sensor assembly

Cowl wire

Engine room main wire
WIRING DIAGRAM
DIDGT±01

H02751
Airbag Sensor Assembly S16
Side Airbag Sensor Assembly RH
A2122
VUPR W
2
ESR A2120
B
1 VUPR
ESR DI±1180
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1374 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1620/21 Side Airbag Sensor Assembly (RH)
Malfunction
CIRCUIT DESCRIPTION
The side airbag sensor assembly RH consists of the safing sensor, the diagnostic circuit, the lateral decelera-
tion sensor, etc.
If the airbag sensor assembly receives signals from the lateral deceleration sensor, it determines whether
or not the SRS should be activated.
DTC B1620/21 is recorded when a malfunction is detected in the side airbag sensor assembly RH circuit.
DTC No.DTC Detection ConditionTrouble Area
B1620/21

The airbag sensor assembly receives a line short circuit
signal, an open circuit signal, a short circuit to ground sig-
nal or a short circuit to B+ signal in the side airbag sensor
assembly RH circuit for 2 seconds.

Side airbag sensor assembly RH malfunction

Airbag sensor assembly malfunction

Side airbag sensor assembly RH

Airbag sensor assembly

Floor wire
WIRING DIAGRAM
DIDGU±01

H02751
Airbag Sensor Assembly S15
Side Airbag Sensor Assembly LH
A1919
VUPL W
2
ESL A1921
B
1 VUPL
ESL DI±1186
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1380 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1625/22 Side Airbag Sensor Assembly (LH)
Malfunction
CIRCUIT DESCRIPTION
The side airbag sensor assembly LH consists of the safing sensor, the diagnosis circuit, the lateral decelera-
tion sensor, etc.
If the airbag sensor assembly receives signals from the lateral deceleration sensor, it determine whether or
not the SRS should be activated.
DTC B1625/22 is recorded when a malfunction is detected in the side airbag sensor assembly LH circuit.
DTC No.DTC Detection ConditionTrouble Area
B1625/22

The airbag sensor assembly receives a line short circuit
signal, an open circuit signal, a short circuit to ground sig-
nal or a short circuit to B+ signal in the side airbag sensor
assembly LH circuit for 2 seconds.

Side airbag sensor assembly LH malfunction

Airbag sensor assembly malfunction

Side airbag sensor assembly LH

Airbag sensor assembly

Floor wire No. 2
WIRING DIAGRAM
DIDGV±01

H02751
Airbag Sensor Assembly S27
Curtain Shield Airbag
Sensor Assembly RH
A2121
W
2
A2119
B
1 VUCR
ESCRVUCR
ESCR DI±1192
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1386 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1630/23 Curtain Shield Airbag Sensor (RH)
Malfunction
CIRCUIT DESCRIPTION
The curtain shield airbag sensor assembly RH consists of the safing sensor the diagnostic circuit, the lateral
deceleration sensor, etc.
If the airbag sensor assembly receives signals from the lateral deceleration sensor, it determines whether
or not the SRS should be activated.
DTC B1630/23 is recorded when a malfunction is detected in the curtain shield airbag sensor RH circuit.
DTC No.DTC Detection ConditionTrouble Area
B1630/23

The airbag sensor assembly receives a short circuit sig-
nal, an open circuit signal, a short circuit to ground signal
or a short circuit to B+ signal in the curtain shield airbag
sensor RH circuit for 2 seconds.

Curtain shield airbag sensor assembly RH malfunction

Airbag sensor assembly malfunction

Curtain shield airbag sensor assembly RH

Airbag sensor assembly

Floor wire
WIRING DIAGRAM
DIDGW±01