Honda Pilot: Heated Steering Wheel System Description - Components

Steering Heater

Heating is done by the current from the heated steering wheel control unit.

Heated Steering Wheel Switch

The heated steering wheel switch is a momentary switch and performs input to the heated steering wheel control unit. The heated steering wheel indicator is driven by the heated steering wheel control unit.

Heater Temperature Sensor

The temperature of the steering heater is feedback to the heated steering wheel control unit.

Heated Steering Wheel System Description - Control/Function

Basic Control/Function

The heated steering wheel switch turns on or off the heated steering wheel system. When the heated steering wheel switch is pressed, the switch sends on signals to the heated steering wheel control unit, and after that the heated steering wheel control unit turns on the heated steering wheel indicator. Then, the heated steering wheel control unit provides power to the steering heater. The heated steering wheel control unit controls outputs to the steering heater based on the heater temperature sensor values. While the heater is working, the heated steering wheel control unit receives the illumination signal via LIN, and adjusts the brightness of the indicator.

Automatic Control

When the remote engine start control system is activated, the climate control system turns on the seat heater system based on the vehicle temperature. When the seat heater is turned on by the remote engine start control system, the gauge control module sends ON commands to the heated steering wheel control unit. Then, the heated steering wheel control unit provides power to the heater pad. When the seat heater is turned on in this procedure, the heated steering wheel indicator does not turn on.

Transition to Off State

The heater output shall transition to the off state under any of the following conditions

• HTR +B power is off.
• The current operation state is off.
• Thermistor open/short failure is detected (DTC store).
• Heater current abnormal failure is detected (DTC store).
• Steering wheel not heating failure is detected (DTC store).
• Main heater switch failure is detected (DTC store).
• Heated steering wheel switch failure is detected.

Heated Steering Wheel System Description - Overview

The heated steering wheel has a steering heater inside the steering wheel. Based on the heater temperature sensor signals, the heated steering wheel control unit monitors the steering wheel temperature, and adjusts it to the suitable temperature.

Heated Steering Wheel System Description - System Diagram

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