Initial Inspection and Diagnostic Overview

Ventilated Seats Self-Diagnostic Function

The seat ventilation control unit has a thermistor self-diagnostic function. It indicates the result by lighting the LEDs of the seat ventilation switch.

Entering the Self-diagnostic Function

1. Push and hold the HEAT side of the driver's seat ventilation switch.

2. Turn the combination light switch () ON.

3. Turn the ignition switch to ON (II).

4. Within 2 to 5 seconds, turn the combination light switch OFF, then () ON and OFF again.

5. Release the HEAT side of the driver's seat ventilation switch, then press it again 3 times within 5 seconds.

6. When the system enters self-diagnostic mode, all of the indicators turn on for 3 seconds.

- During self-diagnostic mode, the control unit blinks the driver's or front passenger's seat ventilation switch heat indicators in a specific pattern corresponding to the failure.
- An LED pattern will start to blink 2 seconds after all indicators turn off.
- The LED pattern will continue to blink every 2 seconds until self-diagnostic mode is off.
- If more than 1 failure exists, each pattern will be displayed according to its priority every 2 seconds.
After all patterns are displayed, the cycle will be repeated until self-diagnostic mode is off.
- The DTC will be displayed on either the driver's seat ventilation switch or front passenger's seat ventilation switch, dependent upon where the failure has occurred.

Indicator Blink Pattern





*: The indicator(s) will come on 4 times for 1 second each every 1 second.

How To Clear the DTC

Whenever the control unit detects failures (abnormal seat heater voltage, abnormal seat heater current, a seat ventilation switch failure, and/or a driver's side or front passenger's side seat not heating), each failure is stored in the control unit.

The DTCs will be cleared when the corresponding HEAT side of the seat ventilation switch is held for 6 seconds during self-diagnostic mode.

NOTE:

- Completely clear all DTCs for the driver's side (or passenger's side) before clearing the other side.
- After clearing the DTCs, all seat heater indicators will turn on for 2 seconds, and then go off.
- A thermistor open or a thermistor short failure is stored only when the ignition switch is ON (II). After the ignition switch is turned to LOCK (0), it will be cleared.
- For self-diagnostic mode display of a thermistor open or a thermistor short failure, if the failure has already occurred, it will be detected within 6 seconds after the ignition switch is turned to ON (II).
- To exit the self-diagnostic mode, turn the ignition switch to LOCK (0).