Toyota Sequoia (2005). Manual - part 270

F19790

Combination Meter

Tire Pressure
Monitor ECU

Engine Room J/B

I18
Ignition SW

IGN1

B–O

IG2

AM2

1C

11

Battery

2

1H

T17

C5

GR–L

Tire Pressure

B–R

B

5

6

5

4

AM2

24

6

IND

Instrument Panel J/B

C6

20

2D

1

2C

1

1C

3

1J

7

F10
Fusible Link Block

Instrument Panel J/B

W–R

W–R

B

T17

T18 Tire Pressure 
Warning Reset SW

G–R

CALSW

GND

T17

1H

1H

1F

7

1

10

W–B

11

10

Instrument Panel J/B

W–B

A

J8
J/C

IE

1

2

–

DIAGNOSTICS

TIRE PRESSURE WARNING SYSTEM

DI–875

1069

Tire Pressure Warning Reset Switch Circuit

CIRCUIT DESCRIPTION

Receiving the signal from the tire pressure warning reset switch, the tire pressure monitor ECU indicates the
initialization of the pressure warning system.

WIRING DIAGRAM

DIDKG–01

F19144

Tire Pressure Warning Reset Switch

ON

OFF

2

1

DI–876

–

DIAGNOSTICS

TIRE PRESSURE WARNING SYSTEM

1070

INSPECTION PROCEDURE

NOTICE:
It is necessary to register an ID code after replacing the tire pressure monitor valve sub–assy and/or
tire pressure monitor ECU (see page 

DI–805

).

1

Check tire pressure warning reset switch function.

CHECK:
Perform the tire pressure warning reset switch test in TEST MODE PROCEDURE (see page 

DI–810

).

OK:

Reset switch ON: Tire pressure warning lamp comes on.
Reset switch OFF: Tire pressure warning lamp blinks.

NG

Go to step 2.

OK

End.

2

Inspect tire pressure warning reset switch.

PREPARATION:
Disconnect the tire pressure warning reset switch connector.
CHECK:
Measure the resistance between terminals 1 and 2 of the tire
pressure warning reset switch when the tire pressure warning
switch is ON and OFF.
OK:

Switch Condition

Specified Condition

ON

Below 1 

Ω

OFF

10 k

Ω

 or higher

NG

Replace tire pressure warning reset switch.

OK

F19884

Tire Pressure Warning Reset Switch
(harness side connector)

Tire Pressure Monitor ECU:

T18

CALSW

T17

–

DIAGNOSTICS

TIRE PRESSURE WARNING SYSTEM

DI–877

1071

3

Check harness and connector (Tire pressure warning reset switch – Tire pres-
sure monitor ECU)

PREPARATION:
Disconnect the tire pressure warning reset switch T18 connec-
tor and tire pressure monitor ECU T17 connector .
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester Connection

Specified Condition

T17–10 (CALSW) – T18–1

Below 1 

Ω

T17–10 (CALSW) – Body ground

10 k

Ω

 or higher

NG

Repair or replace harness or connector.

OK

Replace tire pressure monitor ECU
(See page 

SA–20

).

F19175

Tire Pressure
Monitor ECU

IG

GND

T17

11

B–R

I18
Ignition SW

2

AM1

8

W

Battery

T17

2

8

3C

A

A

J37
J/C

B–R

IG1

1

ECU–IG

B–R

B–Y

1

5

2

AM1

ALT

B

W–B

A

J8
J/C

W–B

W–L

F10
Fusible Link Block

Instrument Panel J/B

8

3A

4

1F

4

1C

1

1L

6

1C

Instrument Panel J/B

IE

10

1F

1

1H

Instrument Panel J/B

Sub J/B No. 3

DI–878

–

DIAGNOSTICS

TIRE PRESSURE WARNING SYSTEM

1072

ECU Power Source Circuit

CIRCUIT DESCRIPTION

This is the power source for the tire pressure monitor ECU. It also supplies power to the tire pressure monitor
receiver via the ECU.

WIRING DIAGRAM

DIDKH–01