Toyota Sequoia (2005). Manual - part 631

DIDKT–01

I25617

A14
A/C Room Temp. 
Sensor (Front)

2

1

R–W

SG–TR

TR

Integration Control and Panel

3

L–W

I20

1

I20

–

DIAGNOSTICS

AIR CONDITIONING SYSTEM

DI–2319

2513

CIRCUIT INSPECTION

DTC

11

Front Room Temperature Sensor Circuit

CIRCUIT DESCRIPTION

This sensor detects the temperature inside the cabin and sends the appropriate signals to the integration
control and panel.

DTC No.

Detection Item

Trouble Area

11

Open or short in front room temperature sensor circuit.

Front room temp. sensor

Harness or connector between front room temp. sensor and

integration control and panel

Integration control and panel

WIRING DIAGRAM

I28847

SG–TR

TR

I20

Integration Control and Panel:

DI–2320

–

DIAGNOSTICS

AIR CONDITIONING SYSTEM

2514

INSPECTION PROCEDURE

1

Check voltage between terminals TR and SG–TR of integration control and pan-
el.

PREPARATION:
Remove integration control and panel with connectors still con-
nected.
CHECK:
(a)

Turn the ignition switch to ON.

(b)

Measure the voltage between terminals TR and SG–TR
of the integration control and panel connector at each
temperature.

OK:

Voltage :
at 25

°

C (77

°

F) : 1.8 to 2.2 V

at 40

°

C (104

°

F) : 1.2 to 1.6 V

HINT:
As the temperature increases, the voltage decreases.

NG

Go to step 2.

OK

Proceed to next circuit inspection shown in problem symptoms table (See page 

DI–2304

). How-

ever, if DTC 11 is displayed, replace integration control and panel.

I08310

2

1

I28970

Resistance (k

Ω

)

Temperature

4.0

2.0

3.5

1.5

0.0

10

3.0

1.0

2.5

0.5

20

30

40

50

60

68

86

104

122

140

(



C)

(



F)

50

–

DIAGNOSTICS

AIR CONDITIONING SYSTEM

DI–2321

2515

2

Check front room temperature sensor.

PREPARATION:
Disconnect the room temperature sensor connector.
CHECK:
Measure the resistance between terminals 1 and 2 of the room
temperature sensor connector at each temperature.
OK:

Tester connection

Condition

Specified condition

1–2

10



C (50



F)

3.00 to 3.73 k

Ω

1–2

15



C (59



F)

2.45 to 2.88 k

Ω

1–2

20



C (68



F)

1.95 to 2.30 k

Ω

1–2

25



C (77



F)

1.60 to 1.80 k

Ω

1–2

30



C (86



F)

1.28 to 1.47 k

Ω

1–2

35



C (95



F)

1.00 to 1.22 k

Ω

1–2

40



C (104



F)

0.80 to 1.00 k

Ω

1–2

45



C (113



F)

0.65 to 0.85 k

Ω

1–2

50



C (122



F)

0.50 to 0.70 k

Ω

1–2

55



C (131



F)

0.44 to 0.60 k

Ω

1–2

60



C (140



F)

0.36 to 0.50 k

Ω

NOTICE:

Even slightly touching the sensor may change the re-
sistance value. Be sure to hold the connector of the
sensor.

When measuring, the sensor temperature must be
the same as the ambient temperature.

HINT:
As the temperature increases, the resistance decreases (see
the graph on the left).

NG

Replace front room temperature sensor.

OK

3

Check harness and connector between front room temperature sensor and in-
tegration control and panel (See page 

IN–35

).

NG

Repair or replace harness or connector.

OK

Replace integration control and panel.

I28832

SG–TAM

Integration Control
and Panel

20

12

I19

Y–B

IA5

13

A1
A/C Ambient
Temp. Sensor

Y–B

8

TAM

LG–B

LG–B

1

2

I19

IA5

Y–B

J/C

J14

C

A

J15

DI–2322

–

DIAGNOSTICS

AIR CONDITIONING SYSTEM

2516

DTC

12

Ambient Temperature Sensor Circuit

CIRCUIT DESCRIPTION

This sensor detects the ambient temperature and sends the appropriate signals to the integration control
and panel.

DTC No.

Detection Item

Trouble Area

12

Open or short in ambient temperature sensor circuit.

Ambient temp. sensor

Harness or connector between ambient temp. sensor and

integration control and panel

Integration control and panel

WIRING DIAGRAM

DIDKU–01