Circuit/System Verification

Using an Infrared Temperature Gun

1. Engine running, all accessories OFF.
2. Verify the steering wheel heater switch is OFF and the steering wheel heater indicator should not be illuminated.
   • If the heater indicator is illuminated 

     Refer to Heated Steering Wheel Indicator Malfunction 

   • If the heater indicator is not illuminated 
Fig 1: Steering Wheel Rim Measurement Point
Courtesy of GENERAL MOTORS COMPANY
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 (1).
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.

   • If the steering wheel temperature is 25°C (77°F) or below 
5. Press and release the steering wheel heater 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 

   • If the heater indicator illuminates 
Fig 2: Steering Wheel Rim Measurement Point
Courtesy of GENERAL MOTORS COMPANY
NOTE:

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

6. Measure the temperature readings at the 3 and 9 o'clock positions on the steering wheel rim (1).
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.

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