GM Service Manual Online
For 1990-2009 cars only
Antenna 1 Status: The scan tool displays Normal/Out of Range. The scan tool will display Normal if the antenna coil is OK or Out of Range if the antenna coil is malfunctioning.

Battery Voltage: The scan tool displays Normal/Out of Range. The scan tool displays Normal if the battery voltage is OK or Out of Range if the battery voltage is below or above operating range.

ECM/Immobilizer Status: The scan tool displays Normal/Error. The scan tool displays Normal if ECM/Immobilizer status is OK or Error if the status is not OK.

Ignition: The scan tool displays On/Off. The scan tool displays On if the ignition is turned to the On or Run position or Off if the ignition is in the Off position.

Immobilizer State: The scan tool displays Locked/Unlocked. The scan tool displays Locked if the immobilizer is disabling engine start or Unlocked if engine start is allowed.

Key in Ignition: The scan tool displays Yes/No. The scan tool displays Yes if the key is in the ignition switch or No if the key is not in the ignition switch.

Key in Ignition: The scan tool displays Master Key/Sub Key/Unknown Key. The scan tool displays Master Key if the key in the ignition is a master key, Sub Key if the key in the ignition is a sub key or Unknown Key if the immobilizer does not recognize the key in the ignition.

Master Keys Learned: The scan tool displays Counts. The scan tool displays the number of master keys that have been registered.

Password Status: The scan tool displays Valid/Invalid. The scan tool displays Valid if the password is correct or Invalid if the password is incorrect.

Starter Inhibit: The scan tool displays Active/Inactive. The scan tool displays Active if starting is not permitted or Inactive if starting is permitted.

Total Keys Learned: The scan tool displays Counts. The scan tool displays the total number of keys that have been registered.

Transponder Key: The scan tool displays Normal/Error. The scan tool displays Normal if the transponder key is OK or Error if there is a problem with the transponder key.