Circuit/System Verification

Using an Infrared Temperature Gun

1. Engine running, all accessories OFF.
2. Verify the Heated Steering Wheel Switch - S70L Cruise Control Switch is OFF and the steering wheel heater indicator is not be illuminated.
   • If the heater indicator is illuminated 

     Refer to Heated Steering Wheel Indicator Malfunction 

   • Go to next step: If the heater indicator is not illuminated 
NOTE:

The Infrared Temperature Gun should be within 50.8mm (2 in) and parallel to  the steering wheel rim when taking temperature readings.

3. Measure the temperature readings at the 3 and 9 o'clock positions on the steering wheel rim.
4. Verify that the steering wheel temperature is 25°C (77°F) or below.
   • If the steering wheel temperature is greater than 25°C (77°F) 

     Allow the steering wheel to cool before proceeding to next step.

   • Go to next step: If the steering wheel temperature is 25°C (77°F) or below 
5. Press and release the Heated Steering Wheel Switch - S70L Cruise Control Switch. The steering wheel heater indicator should illuminate. Allow the steering wheel to heat for a minimum of 10 min so that the temperature stabilizes.
   • If the heater indicator does not illuminate 

     Refer to Heated Steering Wheel Indicator Malfunction 

   • Go to next step: If the heater indicator illuminates 
6. Measure the temperature readings at the 3 and 9 o'clock positions on the steering wheel rim.
7. Verify that the steering wheel temperature is greater than 28°C (82.4°F) within 20 min.
   • If after 20 minutes the measured temperature is less than 28°C (82.4°F) 

     Refer to Circuit System Testing.

   • Go to next step: If after 20 minutes the measured temperature is 28°C (82.4°F) or greater 
8. All OK.