Onstar Button Test
OnStar Button Test1. Remove the roof console.
2. Measure the resistance between the No. 1 and No. 2 terminals of roof console 20P connector in each switch position according to the table.
3. If the resistance is not as specified, replace the button.
4. Check the LEDs continuity between the No. 7, No. 15 and No. 14 terminals of roof console connector (28P). There should be continuity.
5. If the continuity check is not as specified, replace the button.