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Ignition ON, press the OnStar® Call buttons one at the time. Verify that all of the OnStar® If some OnStar® buttons are inoperative but not all, replace the inside rearview mirror. If none of the OnStar® buttons operate, refer to circuit/system testing. Circuit/System Testing 1. Ignition OFF, disconnect the harness connector at the inside rearview mirror. 2. Ignition ON, test for 9.8-10.2 volts between the keypad supply voltage circuit terminal 12 and ground. If less than the specified range, test the supply voltage circuit for a short to ground or If greater than the specified range, test the supply voltage circuit for a short to voltage. 3. Test for 0 volt between the keypad signal circuit terminal 11 and ground. If greater than the specified range, test the keypad signal circuit for a short to voltage. 4. Test for 9.8-10.2 volts between the keypad supply voltage circuit terminal 12 and the keypad signal circuit terminal 11. If less than the specified range, test the keypad signal circuit for an open/high 5. Test for less than 5 ohms between the mirror ground circuit terminal 8 and ground. If greater than the specified range, test the ground circuit for an open/high resistance. 6. Ignition OFF, disconnect the CIM X1 connector. Test for infinite resistance between the keypad signal circuit terminal 11 and ground. If less than the specified range, test the keypad signal circuit for a short to ground. 7. If all circuits test normal, test or replace the button assembly. Component Testing 1. Ignition OFF, disconnect the harness connector at the inside rearview mirror. 2. Test for infinite resistance between the keypad supply voltage terminal 12 and the keypad signal terminal 11. IMPORTANT: Contact the OnStar® Call Center first before pressing the emergency button in order to notify them of the test.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Cellular, Entertainment, and Navigation - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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