GM Service Manual Online
For 1990-2009 cars only
ALC Exhaust Solenoid: Indicates weather the exhaust solenoid is on or off.

Battery Voltage Signal: Range 10.0 - 16.0 V. Voltage measured by the suspension control module.

Compressor Relay: Indicates when the compressor relay is activated.

Compressor Temperature: Identifies when the compressor thermal trip has set.

Door Switch: Indicates if any doors or the hatch is open.

Engine Running: Indicates if the engine is running.

ERH Lamp Command: Indicates when the ERH lamp is commanded on.

ERH Switch: Indicates when the ERH switch is pressed.

Height Sensor Current: Indicates the current of the 5 volt reference circuit for both height sensors and the pressure sensor.

Height Sensor Supply Status: Indicates if the 5 volt reference circuit for both height sensors and the pressure sensor is active.

Ignition: Indicates when the ignition is on or off.

Ignition 3: Indicates switched voltage at the suspension module.

Inflator Switch: Indicates when the inflator switch is pressed.

Inflator Switch Lamp Command: Indicates when the inflator switch lamp is commanded on.

Left Height Sensor: Range 0.5 - 4.85 V. Indicates the vehicle height measured in volts.

Left Isolation Valve: Indicates when the inlet valve is active.

Neutral Switch: Indicates when the shifter is in neutral.

Number of DTCs: Indicates the number of DTCs set in the suspension module.

Park Switch: Indicates when the shifter is in park.

Ride Height Status: Indicates if the vehicle is in extended or normal ride height.

Right Height Sensor: Range 0.5 - 4.85 V. Indicates the vehicle height measured in volts.

Right Isolation Valve: Indicates when the inlet valve is active.

Total Valve Current: Indicates the total current that the inlet valves, exhaust valve, and compressor relay are using.

Tow / Haul Mode: Indicates when the transmission is in the tow / haul mode.

Trim Height Learned: Indicates if the trim height was learned after the calibration procedure.

Vehicle Speed: Indicates the speed of the vehicle.