System malfunction location

• B1B71:11: Evaporator temperature sensor circuit short to ground

• B1B71:13: Evaporator temperature sensor circuit open

Detection condition

• Malfunction in wiring harness between evaporator temperature sensor and climate control unit

Fail-safe function

• A/C output OFF is controlled when the evaporator temperature sensor input value is at 0 °C {32 °F}.

Possible cause

• Connector or terminal malfunction

• Evaporator temperature sensor malfunction

• Open circuit in wiring harness between climate control unit and evaporator temperature sensor

• Short to ground in wiring harness between climate control unit and evaporator temperature sensor

• Climate control unit malfunction

STEP

INSPECTION

ACTION

1

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Disconnect the evaporator temperature sensor connector.

  (See EVAPORATOR TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].)

• Inspect the connector and terminals (corrosion, damage, pin disconnection).

• Are the connector and terminals normal?

Yes

Go to the next step.

No

Repair/replace the connector or terminal.

After repair procedure, go to the next step.

2

• Inspect the evaporator temperature sensor.

  (See EVAPORATOR TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].)

• Is it normal?

Yes

Go to the next step.

No

Replace the evaporator temperature sensor.

(See A/C UNIT DISASSEMBLY/ASSEMBLY.)

Go to the next step.

3

• Disconnect the climate control unit connector.

  (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

• Disconnect the evaporator temperature sensor connector.

  (See EVAPORATOR TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].)

• Inspect for continuity between the following terminals (wiring harness-side):

• Climate control unit terminal E???evaporator temperature sensor terminal A

• Climate control unit terminal J???evaporator temperature sensor terminal B

• Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and evaporator temperature sensor terminal.

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has an open circuit.

Go to the next step.

4

• Inspect for continuity between the following terminal (wiring harness-side) and body ground:

• Climate control unit terminal J

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and evaporator temperature sensor terminal.

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to ground.

Go to the next step.

No

Connect the climate control unit connector, then go to the next step.

5

• Inspect the connector and terminals (corrosion, damage, pin disconnection).

• Are the connector and terminals normal?

Yes

Go to the next step.

No

Repair/replace the malfunctioning vehicle wiring harness, connector, or terminal.

After repair procedure, go to the next step.

6

• Connect the climate control unit connector.

• Connect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Switch the ignition ON (engine off or on).

• Inspect the voltage at the following climate control unit terminal (wiring harness-side).

• Terminal J (evaporator temperature sensor input signal)

• Is the voltage normal? (Approx. 5 V)

Yes

The system is normal at present.

Go to the next step.

No

Go to the next step.

7

• Switch the ignition off.

• Disconnect the negative battery cable.

• Reconnect the disconnected connectors.

• Connect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

• Clear the past malfunction from memory.

  (See CLEARING DTC [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

• Verify DTCs.

  (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

• Is DTC B1B71:11 or B1B71:13 output?

Yes

Repeat the inspection from Step 1.

• If the malfunction does not recur, go to the next step.

• If the malfunction recurs, replace the climate control unit.

  (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

Go to the next step.

No

Go to the next step.

8

• Verify other DTCs displayed.

  (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

• Are any other DTCs output?

Yes

Perform the corresponding DTC inspection.

(See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)

No

DTC troubleshooting completed.