Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VK0Z
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 08/2016]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1417/17; Rear Evaporator Temperature Sensor Circuit; 2016 MY Sienna [12/2015 - 08/2016]

DTC

B1417/17

Rear Evaporator Temperature Sensor Circuit

DESCRIPTION

The rear evaporator temperature sensor is installed on the rear evaporator. It detects the rear evaporator temperature. The sensor sends a signal to the air conditioning amplifier. The resistance of the rear evaporator temperature sensor changes in accordance with the rear evaporator temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier applies voltage (5 V) to the rear evaporator temperature sensor and reads voltage changes as the resistance of the rear evaporator temperature sensor changes.

DTC Code

DTC Detection Condition

Trouble Area

B1417/17

Open or short in rear evaporator temperature sensor circuit
  • Rear evaporator temperature sensor
  • Harness or connector between rear evaporator temperature sensor and air conditioning amplifier
  • Air conditioning amplifier

WIRING DIAGRAM

PROCEDURE

1.

READ VALUE USING TECHSTREAM

(a) Connect Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / 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

Ambient Temp Sens (Rear)

Rear evaporator temperature sensor /

Min.: -29.7°C (-21.46°F)

Max.: 59.55°C (139.19°F)

Actual rear evaporator temperature is displayed

Open in the circuit: -29.7°C (- 21.46°F)

Short in the circuit: 59.55°C (139.19°F)

OK:

The display is as specified in the normal condition column.

Result

Result

Proceed to

NG

A

OK (When troubleshooting according to the 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 AIR CONDITIONING AMPLIFIER

A

2.

INSPECT REAR EVAPORATOR TEMPERATURE SENSOR

(a) Remove the rear evaporator temperature sensor.

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

Text in Illustration

*a

Front view of wire harness connector

(to Rear Evaporator Temperature Sensor)

Standard Resistance:

Tester Connection

Condition

Specified Condition

L23-7 (-) - L23-8 (+)

-10°C (14°F)

7.40 to 9.20 kΩ

L23-7 (-) - L23-8 (+)

-5°C (23°F)

5.65 to 7.00 kΩ

L23-7 (-) - L23-8 (+)

0°C (32°F)

4.35 to 5.40 kΩ

L23-7 (-) - L23-8 (+)

5°C (41°F)

3.40 to 4.20 kΩ

L23-7 (-) - L23-8 (+)

10°C (50°F)

2.68 to 3.30 kΩ

L23-7 (-) - L23-8 (+)

15°C (59°F)

2.10 to 2.60 kΩ

L23-7 (-) - L23-8 (+)

20°C (68°F)

1.66 to 2.10 kΩ

L23-7 (-) - L23-8 (+)

25°C (77°F)

1.32 to 1.66 kΩ

L23-7 (-) - L23-8 (+)

30°C (86°F)

1.05 to 1.35 kΩ

NOTICE:

  • Even slightly touching the sensor may change the resistance value. Be sure to hold the connector of the sensor.
  • When measuring, the sensor temperature must be the same as the rear evaporator temperature.

HINT:

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

NG

REPLACE REAR EVAPORATOR TEMPERATURE SENSOR

OK

3.

CHECK HARNESS AND CONNECTOR (REAR EVAPORATOR TEMPERATURE SENSOR - AIR CONDITIONING AMPLIFIER)

(a) Disconnect the rear evaporator temperature sensor connector.

(b) Disconnect the air conditioning amplifier connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

L23-8 (+) - D74-4 (TEC)

Always

Below 1 Ω

L23-7 (-) - D74-19 (SGND)

Always

Below 1 Ω

D74-4 (TEC) - Body ground

Always

10 kΩ or higher

D74-19 (SGND) - Body ground

Always

10 kΩ or higher
OK

REPLACE AIR CONDITIONING AMPLIFIER

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR