Toyota Venza manuals

Toyota Venza: Room Temperature Sensor Circuit (B1411/11)

Toyota Venza Service Manual / Heating / Air Conditioning / Air Conditioning System / Room Temperature Sensor Circuit (B1411/11)

DESCRIPTION

The room temperature sensor is installed in the instrument panel. It detects the cabin temperature to control the air conditioning AUTO mode. The resistance of the room temperature sensor changes in accordance with the cabin temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The A/C amplifier applies voltage (5 V) to the room temperature sensor and reads voltage changes as the resistance of the room temperature sensor changes. This sensor also sends appropriate signals to the A/C amplifier.

DTC No.

DTC Detection condition

Trouble Area

B1411/11

Open or short in room temperature sensor circuit

  • Room temperature sensor
  • Harness or connector between room temperature sensor and A/C amplifier
  • A/C amplifier

WIRING DIAGRAM


PROCEDURE

1.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body / Air Conditioner / Data List.

(e) Check the value(s) by referring to the table below.

Air Conditioner

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Room Temperature Sensor

Room temperature sensor /

Min.: -6.5°C (20.3°F)

Max.: 57.25°C (135.05°F)

Actual cabin temperature displayed

-

OK:

The display is as specified in the Normal Condition column.

Result

Proceed to

NG

A

OK (When troubleshooting according to Problem Symptoms Table)

B

OK (When troubleshooting according to the DTC)

C


B

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


C

REPLACE A/C AMPLIFIER


A

2.

INSPECT ROOM TEMPERATURE SENSOR

(a) Remove the room temperature sensor.

(b) Disconnect the room temperature sensor connector.



(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

D11-1 - D11-2

10°C (50°F)

3.00 to 3.73 kΩ

D11-1 - D11-2

15°C (59°F)

2.45 to 2.88 kΩ

D11-1 - D11-2

20°C (68°F)

1.95 to 2.30 kΩ

D11-1 - D11-2

25°C (77°F)

1.60 to 1.80 kΩ

D11-1 - D11-2

30°C (86°F)

1.28 to 1.47 kΩ

D11-1 - D11-2

35°C (95°F)

1.00 to 1.22 kΩ

D11-1 - D11-2

40°C (104°F)

0.80 to 1.00 kΩ

D11-1 - D11-2

45°C (113°F)

0.65 to 0.85 kΩ

D11-1 - D11-2

50°C (122°F)

0.50 to 0.70 kΩ

D11-1 - D11-2

55°C (131°F)

0.44 to 0.60 kΩ

D11-1 - D11-2

60°C (140°F)

0.36 to 0.50 kΩ

NOTICE:

  • Hold the sensor only by its connector. Touching the sensor may change the resistance value.
  • When measuring, the sensor temperature must be the same as the ambient temperature.

HINT:

As the temperature increases, the resistance decreases (see the graph).

Text in Illustration

*1

Component without harness connected

(Room Temperature Sensor)

*2

Sensing Portion


NG

REPLACE ROOM TEMPERATURE SENSOR


OK

3.

CHECK HARNESS AND CONNECTOR (ROOM TEMPERATURE SENSOR - A/C AMPLIFIER)

(a) Disconnect the A/C amplifier connector.


(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

D47-29 (TR) - D11-1

Always

Below 1 Ω

D47-34 (SG-1) - D11-2

Always

Below 1 Ω

D47-29 (TR) - Body ground

Always

10 kΩ or higher

D47-34 (SG-1) - Body ground

Always

10 kΩ or higher

Text in Illustration

*1

Front view of wire harness connector

(to A/C Amplifier)

*2

Front view of wire harness connector

(to Room Temperature Sensor)



OK

REPLACE A/C AMPLIFIER


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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