GM Service Manual Online
For 1990-2009 cars only
Airbag Warning Lamp: The scan tool displays On or Off. The state of the air bag indicator as commanded by the IPC.

Analog Dim: The scan tool displays 0.1 to 13.6V. The IPC uses the instrument panel lamps dimming control circuit to determine the intensity of the IPC displays. Higher voltage corresponds to higher intensity of the electronic displays in the IPC.

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

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

Change Oil Lamp: The scan tool displays On or Off. The state of the CHANGE OIL SOON indicator as commanded by the IPC.

Cluster Part Number: The scan tool displays the four digit part number of the IPC.

Coolant Hot Lamp: The scan tool displays On or Off. The state of the engine coolant temperature indicator as commanded by the IPC.

Crank: The scan tool displays Active or Inactive. The IPC displays Active if it senses voltage at the crank voltage circuit.

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

Display Trip Reset Sw.: The scan tool displays On or Off. The state of the display trip reset switch. The scan tool displays On when the switch is depressed.

Door Ajar Lamp: The scan tool displays On or Off. The state of the DOOR/TRUNK indicator as commanded by the IPC.

Driver Door Switch: The scan tool displays Open or Closed. The BCM monitors the driver door ajar switch. A closed switch is displayed as Open.

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 Level Switch: The scan tool displays OK or Low. The PCM monitors the signal circuit of the engine oil level switch. An open switch, with low engine oil level, is displayed as Low.

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

Engine Oil Pressure Switch: The scan tool displays OK or Low. The PCM monitors the signal circuit of the engine oil pressure switch. An open switch, with low engine oil pressure, is displayed as Low.

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.

English/Metric State: The scan tool displays English or Metric. The IPC monitors the signal circuit of the E/M button on the DIC switch.

FEIC Mode: The scan tool displays On or Off. The state of the fuel efficiency information center (FEIC) mode switch. The scan tool displays On when the switch is depressed.

FEIC Reset:  The scan tool displays On or Off. The state of the fuel efficiency information center (FEIC) reset switch. The scan tool displays On when the switch is depressed.

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. The IPC receives a class 2 message from the PCM indicating the fuel level percent.

Fuel Level Sensor (3.1L): The scan tool displays 0-5 volts. The PCM monitors the signal circuit of the fuel level sensor.

Ignition 0: The scan tool displays Active or Inactive. The IPC displays Active if it senses voltage at the ignition 0 voltage circuit.

Ignition 0: The scan tool displays 0-16 volts. The voltage measured from the ignition 0 voltage circuit of the IPC.

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

Julian Date of Build: The scan tool displays the build date of the IPC.

Key in Ignition: The scan tool displays Yes or No. The BCM monitors the ignition key alarm switch, where a closed switch, with the key in the ignition, is displayed as Yes.

LCM Lights On Chime: The scan tool displays On or Off. The BCM monitors the headlamp switch, where an open switch, with the headlamp switch in the off position, is displayed as On.

Left Turn Signal: The scan tool displays Active or Inactive. The IPC monitors the left turn signal switch. A closed switch is displayed as Active.

Location of Manufacture: The scan tool displays Metramoros/Flint/Delnosa. The scan tool displays the manufacture location of the IPC.

Low Coolant Input: The scan tool displays Active or Inactive. The IPC monitors the engine coolant indicator module. A closed switch, with low coolant level, is displayed as Active.

Low Coolant Lamp: The scan tool displays On or Off. The state of the low engine coolant level 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 Oil Lamp: The scan tool displays On or Off. The state of the low engine oil level indicator as commanded by the IPC.

Low Tire Lamp: The scan tool displays On or Off. The state of the LOW TIRE indicator as commanded by the IPC.

Low Trac Lamp: The scan tool displays On or Off. The state of the LOW TRAC indicator as commanded by the IPC.

Low Wash Input: The scan tool displays Active or Inactive. The IPC monitors the windshield washer solvent level switch. A closed switch, with low washer fluid, is displayed as Active.

Low Washer Lamp: The scan tool displays On or Off. The state of the LOW WASH indicator as commanded by the IPC.

Oil Pressure Lamp: The scan tool displays On or Off. The state of the engine oil pressure indicator as commanded by the IPC.

Park Brake Switch: The scan tool displays On or Off. The BCM monitors the park brake switch, where a closed switch is displayed as On.

Park Lamp: The scan tool displays Active or Inactive. The IPC monitors the headlamp switch. A closed switch, with the headlamp switch in the park or head position, is displayed as Active.

PROM ID: The scan tool displays a number that the identifies the PROM.

Right Turn Signal: The scan tool displays Active or Inactive. The IPC monitors the right turn signal switch. A closed switch is displayed as Active.

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

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

Service Vehicle Soon Lamp: The scan tool displays On or Off. The state of the SERVICE VEHICLE SOON indicator as commanded by the IPC.

Software Release, Day: The scan tool displays the day of the IPC software release.

Software Release, Month: The scan tool displays the month of the IPC software release.

Software Release, Year: The scan tool displays the IPC software release.

Software Version: The scan tool displays the software version of the IPC.

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

Vehicle Speed: The scan tool displays 0-161 km/h (0-100 mph). The IPC receives a class 2 message from the PCM indicating the vehicle speed.

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.

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