Code No. B1001,B1002: Interior temperature sensor system












COMMENTS ON TROUBLE SYMPTOM
This code is set when the interior temperature sensor circuit is short (Code No.B1001) or is open (Code No.B1002).

PROBABLE CAUSES

  • Malfunction of the interior temperature sensor
  • Damaged the wiring harness or connectors
  • Malfunction of the automatic A/C control panel (A/C-ECU)

DIAGNOSIS PROCEDURE

STEP 1. Connector check: D-08 A/C-ECU connector and D-121 interior temperature sensor connector

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

STEP 2. Check the wiring harness between D-08 A/C-ECU connector (terminals 8 and 29) and D-121 interior temperature sensor connector (terminals 1 and 2).
note Prior to the wiring harness inspection, check intermediate connector D-122, and repair if necessary.

  • 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 interior temperature sensor.
Refer to .

Q. Is the check result normal?
Go to Step 4.
Replace the interior temperature sensor.

STEP 4. M.U.T.-III diagnosis code

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