2006 GMC Sierra 1500 Pickup Owner's Manual - Page 145

4. Shift the transfer case to Two-Wheel High. 5. Simultaneously press and hold the Two-Wheel High and Four-Wheel Low buttons for 10 seconds. The red NEUTRAL light will come on when the transfer case shift to NEUTRAL is complete. 6. Start the engine if it is not already running. 7. Press and hold the foot brake pedal and Shift the transmission to REVERSE (R) for one second, then shift the transmission for one second to DRIVE (D) for an automatic transmission, or FIRST (1) for vehicles equipped with a manual transmission and then let out the clutch. This is to ensure the transfer case is in NEUTRAL. If not, repeat this procedure starting at Step 3. 8. Turn the engine off, by turning the key to ACCESSORY. 9. Place the transmission shift lever in PARK (P) for an automatic transmission, or FIRST (1) for vehicles equipped with a manual transmission. 10. Turn the ignition to LOCK. Shifting Out of NEUTRAL To shift out of NEUTRAL: 1. Set the parking brake and press and hold the regular brake pedal. 2. Shift the transmission to NEUTRAL (N) for an automatic transmission, or press the clutch pedal for vehicles equipped with a manual transmission. Then turn the ignition to RUN with the engine off. 3. Press the button for the desired transfer case shift position (Two-Wheel High, Four-Wheel High, or Four-Wheel Low). 4. After the transfer case has shifted out of NEUTRAL the red light will go out. 5. Release the parking brake. 6. You may start the engine and shift the transmission to the desired position. Excessively shifting the transfer case into or out of the different modes may cause the transfer case to enter the shift protection mode. This will protect the transfer case from possible damage and will only allow the transfer case to respond to one shift per 10 seconds. The transfer case may stay in this mode for up to three minutes. 7. After the transfer case has shifted out of NEUTRAL the red light will go out. 2-51