Toyota Sequoia (2005). Manual - part 634

I28847

RrSG

RrTE

I21

Integration Control and Panel:

–

DIAGNOSTICS

AIR CONDITIONING SYSTEM

DI–2331

2525

INSPECTION PROCEDURE

1

Check voltage between terminals RrTE and RrSG of integration control and pan-
el.

PREPARATION:
Remove the integration control and panel with connectors still
connected.
CHECK:
(a)

Turn the ignition switch to ON.

(b)

Measure the voltage between terminals RrTE and RrSG
of the integration control and panel connector at each
temperature.

OK:

Voltage :
at 0

°

C (32

°

F) : 2.0 to 2.4 V

at 15

°

C (59

°

F) : 1.4 to 1.8 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 17 is displayed, replace integration control and panel.

N16207

Thermometer

Ice

More than
10 cm (3.94in.)

1

2

I28971

Temperature

Resistance (k

Ω

)

9.0

10.0

8.0

5.0

7.0

4.0

2.0

3.0

0.0

14

32

50

68

86

–10

0

10

20

30

(



F)

(



C)

6.0

1.0

DI–2332

–

DIAGNOSTICS

AIR CONDITIONING SYSTEM

2526

2

Check rear evaporator temperature sensor.

PREPARATION:
Remove the rear evaporator temperature sensor (See page 

AC–42

).

CHECK:
Measure the resistance between terminals 1 and 2 of the evap-
orator temperature sensor connector at each temperature.
OK:

Tester connection

Condition

Specified condition

1–2

–10



C (14



F)

7.40 to 9.20 k

Ω

1–2

–5



C (23



F)

5.65 to 7.00 k

Ω

1–2

0



C (32



F)

4.35 to 5.40 k

Ω

1–2

5



C (41



F)

3.40 to 4.20 k

Ω

1–2

10



C (50



F)

2.68 to 3.30 k

Ω

1–2

15



C (59



F)

2.10 to 2.60 k

Ω

1–2

20



C (68



F)

1.66 to 2.10 k

Ω

1–2

25



C (77



F)

1.32 to 1.66 k

Ω

1–2

30



C (86



F)

1.05 to 1.35 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 rear evaporator temperature sensor.

OK

3

Check harness and connector between rear evaporator temperature sensor and
integration control and panel (See page 

IN–35

).

NG

Repair or replace harness or connector.

OK

Replace integration control and panel.

I24455

A31
A/C Room Temp. 
Sensor (Rear)

2

SG–RrTR

RrTR

Integration Control and Panel

14

13

I22

I22

GR–R

B

1

w/ Rear A/C:

GR–R

R–Y

R–Y

J31

E

J32

F

A

J/C

J31

J32

–

DIAGNOSTICS

AIR CONDITIONING SYSTEM

DI–2333

2527

DTC

19

Rear 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

19

Open or short in rear room temperature sensor circuit.

Rear room temp. sensor

Harness or connector between rear room temp. sensor and

integration control and panel

Integration control and panel

WIRING DIAGRAM

DIDKX–01

I28847

RrTR

SG–RrTR

I22

Integration Control and Panel:

DI–2334

–

DIAGNOSTICS

AIR CONDITIONING SYSTEM

2528

INSPECTION PROCEDURE

1

Check voltage between terminals RrTR and SG–RrTR of integration control and
panel.

PREPARATION:
Remove the integration control and panel with connectors still
connected.
CHECK:
(a)

Turn the ignition switch to ON.

(b)

Measure the voltage between terminals RrTR and SG–
RrTR 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 DTC19 is displayed, replace integration control and panel.