Toyota Sequoia (2005). Manual - part 255

DIDK2–01

F19129

T17

–

DIAGNOSTICS

TIRE PRESSURE WARNING SYSTEM

DI–815

1009

TERMINALS OF ECU

HINT:
Inspect the connectors from the back side while the connectors are connected.

Symbols (Terminal No.)

Wiring Color

Terminal Description

Condition

Specified Condition

IG (T17–2) – 

GND (T17–11)

B–R – W–B

IG power source

IG switch ON

10 to 14 V

SPD (T17–3) – 

GND (T17–11)

G–O – W–B

Vehicle speed signal

Vehicle is running

Pulse generation

SIL (T17–4) – 

GND (T17–11)

G–R – W–B

Diagnosis tester commu-
nication line

IG switch ON, when com-
munication is not per-
formed with a tester

8 V or more

IND (T17–6) – 

GND (T17–11)

GR–L – W–B

Tire pressure warning lamp
output signal

IG switch ON, tire pressure

warning lamp ON

8 V or more

IND (T17–6) – 

GND (T17–11)

GR–L – W–B

Tire pressure warning lamp
output signal

IG switch ON, tire pressure

warning lamp OFF

Below 1.5 V

RDA (T17–7) – 

GND (T17–11)

V – W–B

Tire pressure monitor re-
ceiver input signal

IG switch ON, when the
tire pressure monitor re-
ceiver is not connected

10 to 14 V

RF5V (T17–8) – 

GND (T17–11)

L – W–B

Tire pressure monitor re-
ceiver power source

IG switch ON

4.5 to 5.5 V

CAL SW (T17–10) – 

GND (T17–11)

GR – W–B

Tire pressure warning re-

set SW

IG switch ON

Tire pressure warning re-

set SW OFF

10 to 14 V

CAL SW (T17–10) – 

GND (T17–11)

GR – W–B

Tire pressure warning re-

set SW

IG switch ON

Tire pressure warning re-

set SW ON

Below 1.5 V

GND (T17–11) – 

Body ground

W–B – Body ground

Ground

Always

Below 1 

Ω

TC (T17–12) – 

GND (T17–11)

P–B – W–B

Tc terminal

When terminal TC is not

connected.

8 V or more

GND2 (T17–16) – 

GND (T17–11)

BR–R – W–B

Tire pressure monitor re-
ceiver ground

Always

Below 1 

Ω

D13491

DLC3:

BAT

SIL

CG

DIDK3–01

F19148

Combination Meter

Tire Pressure 
Warning Lamp

DI–816

–

DIAGNOSTICS

TIRE PRESSURE WARNING SYSTEM

1010

DIAGNOSIS SYSTEM

1.

CHECK BATTERY VOLTAGE
Battery voltage: 11 to 14 V

If the voltage is below 11 V, recharge the battery before pro-
ceeding.
2.

CHECK DLC3

The vehicle’s tire pressure monitor ECU uses ISO 9141–2 for
communication. The terminal arrangement of DLC3 complies
with SAE J1962 and matches the ISO 9141–2 format.
Verify the conditions listed in the table below:

Terminal No.

Disc.

Connection / Voltage or Resistance

Condition

7

SIL

Bus + Line / Pulse generation

During transmission

4

CG

Chassis Ground to Body Ground / 1 

Ω

 or less

Always

16

BAT

Battery Positive to Body Ground / 10 to 14 V

Always

HINT:
If the hand–held tester display shows UNABLE TO CONNECT
TO VEHICLE when the cable of the hand–held tester is con-
nected to DLC3, the ignition switch is turned to the ON position
and the tester is operated, there is a problem on the vehicle side
or tester side.

If communication is normal when the tester is connected
to another vehicle, inspect DLC3 on the original vehicle.

If communication is still not possible when the tool is con-
nected to another vehicle, the problem is probably in the
tester itself, so consult the Service Department listed in
the tester’s instruction manual.

3.

DIAGNOSIS SYSTEM

(a)

Warning lamp
(1)

The tire pressure warning lamp blinks when there is
any malfunction in the tire pressure warning sys-
tem.

NOTICE:
When the malfunction has been corrected, the tire pres-
sure warning lamp does not come on.
(b)

DTCs (Normal mode)
(1)

DTCs are memorized in the tire pressure monitor
ECU and read by the blinks of the tire pressure
warning lamp or using the hand–held tester (see
page 

DI–820

.

(c)

Test mode
(1)

By switching from normal mode into test mode (in-
put signal check), you can inspect the tire pressure
monitor receiver assy, each tire pressure monitor
valve sub–assy and vehicle speed sensor (see
page 

DI–810

).

F19148

Combination Meter

Tire Pressure 
Warning Lamp

–

DIAGNOSTICS

TIRE PRESSURE WARNING SYSTEM

DI–817

1011

4.

CHECK WARNING LAMP

(a)

Turn the ignition switch to the ON position.

(b)

Check that the tire pressure warning lamp comes on for
3 seconds.

If the warning check result is not normal, proceed to the trouble-
shooting for the tire pressure warning lamp circuit.

Trouble Area

See page

Tire pressure warning lamp circuit

DI–873

Immediately after

turning the IG ON

Always

Comes on
for 3 sec.

Goes off

Comes on

O u t p u t
DTC

Blinks
(*1)

Blinks
(*2)

Blinks
(*3)





























Normal

Low tire pressure

System fail

ECU connector poorly
connected

TC ground
(There is no DTC)

TC

 

ground

(There is DTC)

Test mode

F19135

ON

OFF

0.5 sec.

0.5 sec.

DI–818

–

DIAGNOSTICS

TIRE PRESSURE WARNING SYSTEM

1012

5.

TIRE PRESSURE WARNING LAMP CHART

HINT:
The table below indicates the state of the tire pressure warning lamp after the ignition switch is turned ON.

*1: Comes on and goes off repeatedly at 0.5 second intervals.