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.