GM Service Manual Online
For 1990-2009 cars only
Battery Voltage: The scan tool displays 0-20  Volts. The scan tool displays the voltage as received on the battery positive voltage circuit of the Module or the 72-08 battery voltage message from the DIM over class 2 lines.

Crank Request Signal: The scan tool displays Yes/No. The scan tool displays No until the ignition is placed into the START position then Yes is displayed.

GEN F-Terminal Signal: The scan tool displays 0-100%. The scan tool displays 0-10% until the engine is started and the PCM receives a signal from the generator then OK is displayed.

GEN L-Terminal Signal Command: The scan tool displays On/Off. The scan tool displays Off until the engine is running, then the PCM supplies then the percentage value varies depending on electrical loads

Ignition 1 Signal: The scan tool displays 0-20 Volts. The scan tool displays the voltage as received on the Ignition 1 circuit to the PCM.

Inadvertent Power Relay: The scan tool displays On/Off. The scan tool displays On when the key is in the ACCY. or ON position.

Load Shed Lvl.1 R. Defog.: The scan tool displays Enable/Disable. The scan tool displays Disable unless the RIM has entered level 1 of load management and commanded the rear defrost OFF.

Load Shed Lvl.1 Heated Seats.: The scan tool displays Enable/Disable. The scan tool displays Disable unless the RIM has entered level 1 of load management and commanded the Heated Seats OFF

Load Shed Lvl.2 R. Defog.: The scan tool displays Enable/Disable. The scan tool displays Disable unless the RIM has entered level 2 of load management and commanded the rear defrost OFF.

Load Shed Lvl.2 Heated Seats.: The scan tool displays Enable/Disable. The scan tool displays Disable unless the RIM has entered level 2 of load management and commanded the Heated Seats OFF.

Starter Enable Relay Circuit Status: The scan tool displays Fault/OK/Invalid State. The scan tool displays Fault until the ignition is placed into the START position then OK is displayed.