GM Service Manual Online
For 1990-2009 cars only
4WD: The scan tool displays On or Off. This is the state of the 4WD indicator as commanded by the instrument panel cluster (IPC).

ABS Lamp: The scan tool displays On or Off. The state of the ABS indicator as commanded by the IPC.

Battery: The scan tool displays On or Off. The state of the battery indicator as commanded by the IPC.

Battery Voltage: The scan tool displays 0-19 volts. The voltage measured at the battery positive voltage circuit of the BCM.

Battery Voltage: The scan tool displays 0-19 volts. The voltage measured at the battery positive voltage circuit of the IPC.

Brake Lamp: The scan tool displays On or Off. The state of the BRAKE indicator as commanded by the IPC.

Cargo Lamp On: The scan tool displays On or Off. This is the state of the cargo lamp as commanded by the IPC.

Change Engine Oil: The scan tool displays On or Off. This is the state of the change engine oil indicator as commanded by the IPC.

Check Coolant Temp: The scan tool displays On or Off. This is the state of the check coolant temperature indicator as commanded by the IPC.

Check Engine Oil Level: The scan tool displays On or Off. This is the state of the check engine oil level indicator as commanded by the IPC.

Check Engine Temp: The scan tool displays On or Off. This is the state of the check engine temperature indicator as commanded by the IPC.

Cruise Control: The scan tool displays On or Off. The state of the cruise control indicator as commanded by the IPC.

Cruise Control Active: The scan tool displays Yes or No. This is the state of the cruise control as commanded by the PCM.

Dimming: The scan tool displays Active or Inactive. Active is displayed when the park lamps are ON. Inactive is displayed when the park lamps are OFF.

Displayed Coolant Temp: The scan tool displays the coolant temperature displayed by the IPC in °C (°F). This value may slightly differ from the monitored coolant temperature.

Displayed Fuel Level: The scan tool displays the fuel level percentage displayed by the IPC. This value may slightly differ from the monitored fuel level.

Displayed Odometer: The scan tool displays the odometer data displayed by the IPC in kilometers (miles).

Displayed Trip Odometer: The scan tool displays the trip odometer data displayed by the IPC in kilometers (miles).

Driver Door Jamb Sw: The scan tool displays Active or Inactive. The output of the driver door jamb switch. An open switch with the door open is displayed as Active.

ECT Sensor: The scan tool displays -40 to +151°C (-40 to +304°F). The PCM monitors the voltage at the signal circuit of the engine coolant temperature sensor. The voltage is inversely proportional to the engine coolant temperature.

Engine Oil Life Remaining: The scan tool displays 0-100 percent. The PCM calculates the remaining engine oil life.

Engine Oil Pressure Sensor: The scan tool displays 0 to 5 volts. The PCM monitors the engine oil pressure sensor signal circuit where a low voltage indicates low pressure.

Engine Speed: The scan tool displays 0-9999 RPM. The IPC monitors the engine speed signal circuit from the PCM.

Engine Speed: The scan tool displays 0-9999 RPM. Engine speed is computed by the PCM from the 3X reference input. It should remain close to desired idle under various engine loads with the engine idling.

Fasten Seat Belts: The scan tool displays On or Off. The state of the fasten safety belt indicator as commanded by the IPC.

Fuel Level Sensor: The scan tool displays 0-5 volts. The PCM monitors the fuel level sensor signal circuit where 0 V is an empty tank.

Fuel Tank Level Remaining: The scan tool displays 0-100%. The PCM calculates the amount of fuel remaining in the tank based on the input from the fuel level sensor.

Fuel Tank Level Remaining: The scan tool displays liters. The PCM calculates the amount of fuel remaining in the tank based on the input from the fuel level sensor.

High Beam Lamp: The scan tool displays On or Off. The state of the high beam indicator as commanded by the IPC.

Ignition 1: The scan tool displays Active or Inactive. The BCM displays Active if it senses voltage at the ignition 1 input.

Ignition 1 Signal: The scan tool displays 0-16 volts. The ignition 1 signal represents the system voltage detected by the PCM at the ignition voltage circuit.

Ignition 3: The scan tool displays Active or Inactive. The BCM displays Active if it senses voltage at the ignition 3 input.

Key in Ignition: The scan tool displays Yes or No. The BCM monitors the key in ignition signal circuit. A closed switch with the key in the ignition is displayed as Yes.

Left Turn Signal: The scan tool displays On or Off. The BCM monitors the signal circuit of the left turn signal switch. A closed switch is displayed as On.

Low Coolant: The scan tool displays On or Off. This is the state of the low coolant indicator as commanded by the IPC.

Low Fuel Lamp: The scan tool displays On or Off. The state of the low fuel indicator as commanded by the IPC.

Low Washer Fluid: The scan tool displays On or Off. The IPC monitors the windshield washer solvent level switch, where a closed switch with low washer fluid is displayed as On.

MIL (Malfunction Indicator Lamp) Command: The scan tool displays On or Off. This is the commanded state of the MIL (Malfunction Indicator Lamp) by the PCM.

Module Part Number: The scan tool displays the GM part number of the IPC.

Monitored Coolant Temp: The scan tool displays the coolant temperature data in °C (°F) as provided to the IPC from the PCM via the class 2 serial data link.

Monitored Fuel Level: The scan tool displays the fuel level percentage as provided to the IPC from the PCM via the class 2 serial data link.

Oil Pressure Lamp: The scan tool displays On or Off. The state of the oil pressure indicator as commanded by the IPC. The IPC monitors the engine oil pressure sensor signal where a low sensor resistance is proportional to low oil pressure.

Overspeed Lamp: The scan tool displays On or Off. The state of the overspeed indicator as commanded by the IPC.

Park Brake Switch: The scan tool displays Set or Released. The BCM monitors the park brake switch signal circuit .

Park Lamps: The scan tool displays On or Off. The BCM monitors the signal circuit of the park lamp switch. A closed switch is displayed as On.

Park Switch: The scan tool displays Open or Closed. The state of the park position switch. A closed switch with the shifter in Park is displayed as Closed.

PRNDL State: The scan tool displays the PRNDL range of the vehicle as communicated to the IPC by the PCM via the class 2 serial data link.

Reduced Engine Power: The scan tool displays Inactive or Active. This is the state of the Reduced Engine Power indicator as commanded by the IPC.

Right Turn Signal: The scan tool displays On or Off. The BCM monitors the signal circuit of the right turn signal switch. A closed switch is displayed as On.

Security Lamp: The scan tool displays On or Off. The state of the security indicator as commanded by the IPC.

Security Lamp State: The scan tool displays On, Off or Flashing. The state of the security indicator as commanded by the BCM.

Service 4WD: The scan tool displays On or Off. The state of the Service 4WD indicator as commanded by the IPC.

Tow/Haul: The scan tool displays On or Off. The IPC monitors the signal circuit of the tow/haul switch. A closed switch is displayed as On.

Trans. Fluid Hot: The scan tool displays On or Off. This is the state of trans fluid hot indicator as commanded by the IPC.

Trans. Hot...Idle Engine: The scan tool displays On or Off. This is the state of trans hot indicator as commanded by the IPC.

Trip Reset Switch: The scan tool displays Active or Inactive. The IPC monitors the trip reset switch. A closed switch is displayed as Active.

Upshift Lamp: The scan tool displays On or Off. The state of the Upshift indicator as commanded by the IPC.

Vehicle Speed: The scan tool displays 0-255 km/h (0-155 mph). The BCM monitors the vehicle speed signal circuit from the PCM.

Vehicle Speed: The scan tool displays 0-255 km/h (0-155 mph). The IPC monitors the vehicle speed signal circuit from the PCM.

Vehicle Speed Sensor: The scan tool displays 0-255 km/h (0-155 mph). The PCM monitors the voltage at the signal circuit of the vehicle speed sensor. The voltage is proportional to the vehicle speed.