Toyota Sequoia (2005). Manual — part 628

DIDKP–01

I15876

I21

I20

I19

I22

DIAGNOSTICS

AIR CONDITIONING SYSTEM

DI–2307

2501

TERMINALS OF ECU

Integration Control and Panel

Symbols (Terminals No.)

Wiring Color

Terminal Description

Condition

Specified Condition

+B

GND

(I19–1

I19–10)

R

O

Power source (Back–up)

Always

10 to 14 V

IG+

GND

(I19–2

I19–10)

R–L

O

Power source (IG)

IG switch OFF

ON

10 to 14 V

PSW

GND

L B

O

P

it h i

l

A/C refrigerant pressure: less than

0.19 MPa (2.0 kgf/cm

2

)

10 t 14

B l

1 0 V

PSW

GND

(I19–6

I19–10)

L–B

O

Pressure switch signal

0.19 MPa (2.0 kgf/cm )

or more than 3.14 MPa (32

Kgf/cm

2

)

10 to 14

Below 1.0 V

HR

GND

(I22–6

I19–10)

L–Y

O

Blower motor operation

signal

Blower fan OFF

ON

10 to 14

Below 1.0 V

GND

Body ground

(I19–10

Body ground)

*1

O

Body ground

Ground for main power

supply

Constant

Continuity

ACC

GND

(I19–11

I19–10)

P

O

Power source (ACC)

Turn ignition switch ACC

10 to 14 V

TAM

SG TAM

A bi

t t

t

IG ON, Ambient temp.: 25

°

C (77

°

F)

1.3 to 1.8 V

TAM

SG–TAM

(I19–8

I19–20)

LG–B

Y–B

Ambient temperature sen-

sor signal

IG ON, Ambient temp.: 40

°

C

(104

°

F)

0.8 to 1.3 V

BLW

GND

G B

O

Blower motor operation

Bl

f

OFF

ON

10 t 14

B l

1 0 V

BLW

GND

(I19–4

I19–10)

G–B

O

Blower motor o eration

signal

Blower fan OFF

ON

10 to 14

Below 1.0 V

RrCLK (I21–15)

*1

B

Communication signal

Communication circuit

(Built in Fr A/C control panel

Rr

A/C control panel)

RrDPD (I21–5)

*1

R

Communication signal

Communication circuit

(Built in Fr A/C control panel

Rr

A/C control panel)

RrSWD (I21–6)

*1

W

Communication signal

Communication circuit

(Built in Fr A/C control panel

Rr

A/C control panel)

RrAMH

GND

(I21–8

I19–10)

*1

R–G

O

Rear air mix control ser-

vomotor operation signal

Rr temp. control switch: Max.

COOL

Max. HOT

Below 1.0

10 to 14 V for 16 sec.

RrAMC

GND

(I21–9

I19–10)

*1

L–B

O

Rear air mix control ser-

vomotor operation signal

Rr temp. control switch: Max. HOT

Max. COOL

Below 1.0

10 to 14 V for 16 sec.

RrSG

GND

(I21–10

I19–10)

*1

L–R

O

Ground for rear evapora-

tor temperature sensor

Constant

Continuity

RrS5

RrSG

(I22–4

I21–10)

*1

L–Y

L–R

Power supply for rear air

mix control servomotor

IG ON

4.5 to 5.5 V

DI–2308

DIAGNOSTICS

AIR CONDITIONING SYSTEM

2502

Symbols (Terminals No.)

Wiring Color

Terminal Description

Condition

Specified Condition

RrTP

RrSG

(I21–18

I21–10)

*1

W

L–R

Rear air mix damper posi-

tion

sensor signal

Rr temp. control switch: Max.

COOL

Max. HOT

4.0 to 1.0 V

AC1

GND

(I22–4

I19–10)

G – B

O

Compressor operation

signal

IG ON, A/C switch: OFF

ON

3.7 to 4.5

1.3 to 2.6 V

RrFACE2

GND

(I21–11

I19–10)

*1

P–B

O

Rear air outlet control ser-

vomotor operation signal

Rr A/C control panel switch: except

FACE

FACE

10 to 14

Below 1.0 V

RrBLK (I21–4)

*1

LG–B

Communication signal

Communication circuit

(Built in Fr. A/C control panel

Rr.

A/C control panel)

RrSTX (I21–14)

*1

G–Y

Communication signal

Communication circuit

(Built in Fr. A/C control panel

Rr.

A/C control panel)

RrVM

GND

(I21–7

I19–10)

*1

W–G

O

Rear blower motor control

signal

Rr blower control switch: LO

MID

HI

7.2

4.2

0.5 V

RrHR

GND

(I22–7

I19–10)

*1

L–O

O

Rear blower motor opera-

tion signal

Rr blower control switch: OFF

LO

10 to 14

Below 1.0 V

RrBLW

GND

(I21–16

I19–10)

*1

L

O

Rear blower motor opera-

tion signal

Rr blower control switch: OFF

LO

Below 1.0

1.5 to 3.0 V

RrFACE

GND

(I21–2

I19–10)

*1

Y–B

O

Rear air outlet control ser-

vomotor control signal

Rr A/C control panel FACE switch:

OFF

ON

10 to 14

Below 1.0 V while

switch is pushed

RrB/L

GND

(I21–3

I19–10)

*1

BR–W

O

Rear air outlet control ser-

vomotor control signal

Rr A/C control panel B/L switch:

OFF

ON

10 to 14

Below 1.0 V while

switch is pushed

RrFOOT

GND

(I21–13

I19–10)

*1

G–R

O

Rear air outlet control ser-

vomotor control signal

Rr A/C control panel FOOT switch:

OFF

ON

10 to 14

Below 1.0 V while

switch is pushed

RrTE

RrSG

LG R

L R

Rear evaporator tempera-

Rr evaporator temp.: 0

°

C (32

°

F)

2.0 to 2.4 V

RrTE

RrSG

(I21–17

I21–10)

*1

LG–R

L–R

Rear eva orator tem era

ture sensor signal

Rr evaporator temp.: 15

°

C (59

°

F)

2.0 to 2.4 V

RrB/L2

GND

(I21–12

I19–10)

*1

P–G

O

Rear air outlet control ser-

vomotor control signal

Rr A/C control panel switch: except

B/L

B/L

10 to 14

Below 1.0 V

FOOT

GND

(I21–17

I19–10)

Y–B

O

Air outlet control servo-

motor control signal

Mode control switch except: FOOT

FOOT

10 to 14

Below 1.0 V

FDEF

GND

(I20–7

I19–10)

LG–R

O

Air outlet control servo-

motor control signal

Mode control switch except: FOOT/

DEF

FOOT/DEF

10 to 14

Below 1.0 V

DEF

GND

(I20–18

I19–10)

B–W

O

Air outlet control servo-

motor control signal

Mode control switch except: DEF

DEF

10 to 14

Below 1.0 V

AMH

GND

R L

O

Air mix control servomotor

IG ON, Set temp.: Max. Cool

Below 1.0 V

AMH

GND

(I20–10

I19–10)

R–L

O

Air mix control servomotor

operation signal

IG ON, Set temp.: Max. Hot

10 to 14 V

S5–AM

SG–TP

(I20–22

I20–12)

R–Y

L–R

Power supply for air mix

control servomotor

IG ON

4.5 to 5.5 V

TP

SG–TP

G R

L R

Air mix damper position

IG ON, Set temp.: Max. Cool

3.5 to 4.5 V

TP

SG TP

(I20–15

I20–12)

G–R

L–R

Air mix dam er osition

sensor signal

IG ON, Set temp.: Max. Hot

0.5 to 1.5 V

AMC

GND

W L

O

Air mix control servomotor

IG ON, Set temp.: Max. Cool

10 to 14 V

AMC

GND

(I20–9

I19–10)

W–L

O

Air mix control servomotor

control signal

IG ON, Set temp.: Max. Hot

Below 1.0 V

S5–AI

SG–TPI

(I20–11

I20–13)

L–B

Y–R

Air inlet control servomo-

tor control signal

IG ON

4.5 to 5.5 V

TR

SG–TR

L W

R W

Room temperature sensor

IG ON, Cabin temp.: 25

°

C (77

°

F)

1.8 to 2.2 V

TR

SG TR

(I20–3

I20–1)

L–W

R–W

Room tem erature sensor

signal

IG ON, Cabin temp.: 40

°

C (104

°

F)

1.2 to 1.6 V

DIAGNOSTICS

AIR CONDITIONING SYSTEM

DI–2309

2503

Symbols (Terminals No.)

Wiring Color

Terminal Description

Condition

Specified Condition

TS

S5–TS

LG

B

S l

i

l

IG ON

0 8 t 4 3 V

TS

S5 TS

(I20–14

I20–21)

LG

B

Solar sensor signal

IG ON

0.8 to 4.3 V

AIR

GND

G W

O

Air inlet control servomo-

IG ON, Push FRS switch

Below 1.0 V

AIR

GND

(I20–20

I19–10)

G–W

O

Air inlet control servomo

tor operation signal

IG ON, Push REC switch

10 to 14 V

AIF

GND

R

O

Air inlet control servomo-

IG ON, Push FRS switch

10 to 14 V

AIF

GND

(I20–8

I19–10)

R

O

Air inlet control servomo

tor operation signal

IG ON, Push REC switch

Below 1.0 V

TPI

SG–TPI

W

Y R

Air inlet control servomo-

IG ON, Push REC switch

3.5 to 4.5 V

TPI

SG TPI

(I20–16

I20–13)

W

Y–R

Air inlet control servomo

tor control signal

IG ON, Push FRS switch

0.5 to 1.5 V

R TR

SG R TR

R

t

t

IG ON, Rr room temp.: 25

°

C (77

°

F)

1.8 to 2.2 V

RrTR

SG–RrTR

(I22–13

I22–14)

*1

GR–R

R–Y

Rear room temperature

sensor signal

IG ON, Rr room temp.: 40

°

C

(104

°

F)

1.2 to 1.6 V

FACE

GND

(I20–5

I19–10)

GR

O

Air outlet control servo-

motor control signal

Mode control switch: except FACE

FACE

10 to 14

Below 1.0 V

B/L

GND

(I20–6

I19–10)

BR–W

O

Air outlet control servo-

motor control signal

Mode control switch: except BI–

LEVEL

BI–LEVEL

10 to 14

Below 1.0 V

IGN

GND

Y G

O

E

i

l ti

i

l

E

i

idli

P l

ti

IGN

GND

(I22–3

I19–10)

Y–G

O

Engine revolution signal

Engine idling

Pulse generation

TW

GND

W R

O

Engine coolant tempera-

IG ON

P l

ti

TW

GND

(I22–2

I19–10)

W–R

O

Engine coolant tem era

ture sensor signal

IG ON

Pulse generation

ACT

GND

(I22–5

I19–10)

LG–B

O

Compressor operation

signal

IG ON, A/C switch: OFF

ON

Below 1.0

10 to 14 V

TE

SG–TE

G B

W G

Evaporator temperature

IG ON, Evaporator temp.: 0

°

C

(32

°

F)

2.0 to 2.4 V

TE

SG TE

(I20–4

I20–2)

G–B

W–G

Eva orator tem erature

sensor signal

IG ON, Evaporator temp.: 15

°

C

(59

°

F)

1.4 to 1.8 V

MGC

GND

(I19–5

I19–10)

L

O

Magnetic clutch control

signal

Engine start

A/C switch: OFF

ON

10 to 14

Below 1.0 V

LOCK

GND

(I19–9

I19–10)

W–R

O

Compressor lock sensor

signal

Engine start

A/C switch: OFF

ON

Pulse generation

*1: w/ Rear A/C

DIDKQ–01

D05981

DLC3

I15897

Trouble Code Display

I15897

DEF. SW

DI–2310

DIAGNOSTICS

AIR CONDITIONING SYSTEM

2504

DTC CHECK / CLEAR

1.

DTC CHECK USING HAND–HELD TESTER

(a)

Hook up the hand–held tester to the DLC3.

(b)

Turn the ignition switch to the ON position.

(c)

Read the DTCs following the prompts on the tester
screen.
Refer to the hand–held tester operator’s manual for fur-
ther details.

(d)

Clear the DTCs.

HINT:
After repairing the malfunctions, clear the DTCs.

(1)

Connect the hand–held tester to the DLC3.

(2)

Turn the ignition switch to the ON position.

(3)

Erase the DTCs following the prompts on the tester
screen.

HINT:
Refer to the hand–held tester operator’s manual for further de-
tails.

2.

DTC CHECK (SENSOR CHECK)

(a)

Perform an indicator check. After the indicator check is
completed, the system enters the DTC check mode auto-
matically (See page

DI–2312

).

(b)

Read the DTC displayed on the panel. Refer to the list of
DTCs on page

DI–2317

when reading the DTCs (DTCs

are output on the temperature display.).
If the slower display is desired, press the DEF. SW and
change it to step operation. Each time the Temp. Control
switch is pressed, the display changes by 1 step.

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