Code No. B1016: Heater water temperature sensor Low
Code No. B1017: Heater water temperature sensor High

DIAGNOSIS CODE SET CONDITIONS

These codes are set when short to earth (code No. B1016) or open circuit (code No. B1017) is detected in the heater water temperature circuit.

PROBABLE CAUSES

Malfunction of heater water temperature sensor
Damaged harness wires and connectors
Malfunction of the A/C-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-18 heater water temperature sensor connector, B-09, B-10 A/C-ECU connector

Q. Is the check result normal?

	Go to Step 2.

	Repair the damaged connector.

STEP 2. Check the wiring harness between B-18 heater water temperature sensor connector terminal No. 1, 2 and B-09 A/C-ECU connector terminal No. 38 and B-10 A/C-ECU connector terminal No. 11.

Check the input line for open or short circuit.

Q. Is the check result normal?

	Go to Step 3.

	Repair the wiring harness.

STEP 3. Check the heater water temperature sensor.

Refer to

.

Q. Is the check result normal?

	Go to Step 4.

	Replace the heater water temperature sensor.

STEP 4. Check whether the diagnosis code is reset.

Q. Is the diagnosis code set?

	Replace the A/C-ECU.

	Intermittent malfunction. Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, - How to Cope with Intermittent Malfunctions .)