2004 Chevy Trailblazer change oil light stays on

GM Oil Life System - Resetting

This vehicle has an engine oil life monitor. The GM Oil Life Systemà † will show when to change the engine oil and oil filter. This will usually occur between 5 000 km (3,000 mi) and 12 500 km (7,500 mi) since the last oil change. Under severe conditions, the indicator may come on before 5 000 km (3,000 mi).
Vehicle should not be driven more than 12 500 km (7,500 mi) or 12 months without an oil and oil filter change. The system will not detect dust in the oil. So if the vehicle is driven in a dusty area, be sure to change the oil and oil filter every 5 000 km (3,000 mi) or sooner if the CHANGE OIL SOON indicator comes on. Reset the system when the oil has been changed.
With the Driver Information Center (DIC)
Press the fuel information button until ENGINE OIL LIFE appears in the display.
To reset the monitor, press and hold the select button while ENGINE OIL LIFE is displayed.
Resetting Procedure Without Driver Information Center (DIC)
Turn the ignition key to RUN, with the engine off.
Full press and release the accelerator pedal slowly 3 times within 5 seconds.
If the CHANGE ENGINE OIL light flashes for five seconds, the system is reset. If the light does not flash. Repeat the procedure.
Turn the key to LOCK.
If the CHANGE ENGINE OIL light comes back on when you start the vehicle, the engine oil life system has not reset. Repeat the procedure.