Things You'll Need
Fuses
Needle-nose pliers
Voltmeter
The GMC Yukon has many practical and luxury features that are offered in a number of option packages. Owners are glad they opted for heated seats when the weather turns frigid. If the heated seats on your 2003 GMC Yukon are not providing the warmth you enjoyed in the past, you no doubt will want to find the cause. You can then take steps to fix the problem to get them working again.
Check the Controls
Step 1
Turn the key in the ignition to the "On" position. The heated seats will not work if the ignition for the vehicle is not on.
Step 2
Determine which part of the seat is not heating to the desired comfort level. The seat consists of a backrest and the lower seat which are controlled separately.
Step 3
Press the button on the control panel for the heating option you prefer. Activate the backrest by pressing the button the "Heated Seatback" button. Press the "Heated Seat and Seatback" button if you want to activate both the lower seat and the backrest.
Step 4
Verify that the indicator lights come on for the button that you pressed. Press the button once to select a different temperature option. Temperature options include high, medium and low.
Step 5
Verify that the correct option is selected by observing the indicator lights above the button. Three lights indicate high, two lights indicate medium and one light indicates low.
Check the Fuses
Step 1
Locate the fuse panel that is under the dash on the driver side, and remove the fuse panel cover.
Step 2
View the diagram on the cover to find the fuse for the heated seats. Pull the fuse out of the panel with the needle-nose pliers or fuse puller.
Step 3
Examine the fuse to see if the metal strip is broken, which indicates a blown fuse. Replace a blown fuse with a new one.
Check the Wiring Connector
Step 1
Disconnect the connector for the heated seat circuit. This can be found under the driver and passenger seat.
Step 2
Test the connector with a voltmeter. Insert one end of the probe into one of the pins on the connector. If there is no reading on the voltmeter then the connector is malfunctioning.
Step 3
Clean the connector thoroughly and check it again with the voltmeter. If there is still no reading the connector needs to be replaced.
Tip
Heat will be turned off to the seats whenever you turn off the vehicle's ignition.