Code No. B1003: Mode dial SW error <Vehicles without A/C>










COMMENTS ON TROUBLE SYMPTOM
This code will be set when the air outlet changeover dial position on the AC control panel is detected as abnormal.

PROBABLE CAUSES

  • Malfunction of the heater control panel
  • Damaged the wiring harness or connectors
  • Malfunction of the heater control unit

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-147 heater control panel connector and C-60 heater control unit connector

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

STEP 2. Check the wiring harness between C-147 heater control panel connector (terminals 9 and 1) and C-60 heater control unit connector (terminals 9 and 10).

  • Check the heater control panel 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 whether the diagnosis code is reset.
Replace the heater control panel, and erase the diagnosis code. Then check that no diagnosis code is being set.

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