Code No.B1031: Fin thermo Sensor system (short circuit)
Code No.B1032: Fin thermo Sensor system (open circuit)


COMMENTS ON TROUBLE SYMPTOM
This code is set when the fin thermo sensor circuit is short (Code No.B1031) or is open (Code No.B1032).

PROBABLE CAUSES

  • Malfunction of the fin thermo sensor
  • Damaged wiring harness or connectors
  • Malfunction of the heater control panel or A/C control panel

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-234 heater control panel or C-209 A/C control panel connector and C-215 fin thermo sensor connector

Q. Is the check result normal?
Go to Step 2.
Repair the connector.

STEP 2. Check the wiring harness between C-234 heater control panel or C-209 A/C control panel (terminals 27 and 26) and C-215 fin thermo sensor connector (terminals 2 and 1).

  • Check the sensor signal line and earth line for open or short circuit.

Q. Is the check result normal?
Go to Step 3.
Repair the wiring harness.

STEP 3. Check the fin thermo sensor.

Q. Is the check result normal?
Go to Step 4.
Replace the fin thermo sensor.

STEP 4. Check whether the diagnosis code is reset.

Q. Is the diagnosis code set?
Replace the heater control panel or A/C control panel.
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction).