Heated Steering Wheel

Description and Operation

Description

The heated steering wheel system improves driver comfort by heating the steering wheel when selected manually.

1. Heated Pad

   

   

   Item	Specification
   Voltage	75 W ± 10 % (13.5 V)
   Heated Pad Resistance	1.95 ± 0.2 Ω [21–23 °C]
   NTC Resistance	10.0 kΩ ± 3 % [25 °C]
   	8.875–11.27 kΩ [at 23–27 °C]

Circuit Diagrams

System Diagram

Heated Steering Wheel Circuit

Harness Connector

Terminal Function

Repair Procedures

Inspection

1. 1

   Measure the resistance of the NTC and the heating pad.

   • NTC resistance (Black/Gray):

     10.0 kΩ ± 3 % [25 °C]

     8.875–11.27 kΩ [at 23–27 °C]

   • Heating element resistance (Black/Yellow): 1.95 ± 0.2 Ω [21–23 °C]

2. 2

   Measure the temperature.

   • The steering wheel surface temperature should rise from -20 °C (-4 °F) to 20 °C within 6 minutes.

   • The steering wheel surface temperature should be maintained within 38 ± 4 °C (100.4 ± 39.2 °F) after 25 minutes.

   • At this time, turn on all measuring points (1 - 8)

     

3. 3

   Check the circuit continuity between the terminals of each steering wheel heater switch.