GM Service Manual Online
For 1990-2009 cars only
Table 1: Body Control Module (BCM)
Table 2: Instrument Panel Cluster (IPC)
Table 3: Powertrain Control Module (PCM)

The scan tool data lists contain all the instrument panel, gages, and console related parameters that are available on the scan tool. The parameters in the list are arranged in alphabetical order. The data list column indicates the location of the parameter within the scan tool menu selections.

Use the scan tool data lists as directed by a diagnostic table or in order to supplement the diagnostic procedures. Begin all of the diagnostic procedures with Diagnostic System Check - Vehicle .

Use the scan tool data lists only after the following is determined:

    • There is no published DTC procedure nor published symptom procedure for the customer concern.
    • The DTC or symptom procedure indicated by the diagnostic system check does not resolve the customer concern.

The typical data values are obtained from a properly operating vehicle under the conditions specified in the first row of the scan tool data list table. Comparison of the parameter values from the suspect vehicle with the typical data values may reveal the source of the customer concern.

Body Control Module (BCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF/Headlamps Off/Doors Closed/Trunk Closed/Park Brake Unapplied

Battery Voltage

Charging Info

Volts

9-16 V (Varies)

Dimming Control Signal

Interior Lighting

Volts

Varies

Driver Door Ajar Switch

Doors

Door Closed/Door Ajar

Door Closed

Ext. Trunk/Liftglass Rel. Sw.

Body Rear End

Active/Inactive

Inactive

Headlamp Switch

Exterior Lighting

Active/Inactive

Inactive

Key in Ignition Status

Power Mode

Key In/Key Out

Key In

Left Rear Door Ajar Sw.

Doors

Door Closed/Door Ajar

Door Closed

Park Brake Switch

Inputs

Applied/Released

Released

Parklamp Switch

Exterior Lighting

Active/Inactive

Inactive

Passenger Door Ajar Switch

Doors

Door Closed/Door Ajar

Door Closed

Right Rear Door Ajar Sw.

Doors

Door Closed/Door Ajar

Door Closed

TR Sw. A/B/C/P

Inputs

HI/LOW HI/LOW HI/LOW HI/LOW

LOW HI HI LOW

Instrument Panel Cluster (IPC)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF/Seat Belt Buckled/High Beams Off/Park Brake Unapplied

ABS Telltale

Lamp Status

On/Off

Off

Air Bag Telltale

Lamp Status

Activated/Not Activated

Not Activated

Battery Lamp

Lamp Status

On/Off

Off

Change Oil Telltale

Lamp Status

On/Off

Off

Coolant Temperature

Data

Celsius (Fahrenheit)

85-105°C (185-220°F)

Coolant Warning Lamp

Lamp Status

On/Off

Off

Door Ajar Lamp

Lamp Status

On/Off

Off

Engine Speed

Data

%

Varies

Fuel Gage Position

Data

%

Varies

High Beam Telltale

Lamp Status

On/Off

Off

Incandescent Dimming PWM Cmd.

Data

%

Varies

LCD Dimming

Data

%

Varies

Oil Pressure Lamp

Lamp Status

On/Off

Off

Pointer Dimming

Data

%

Varies

Seatbelt Telltale

Lamp Status

On/Off

Off

Service Engine Soon Lamp

Lamp Status

On/Off

Off

Service Vehicle Soon Lamp

Lamp Status

On/Off

Off

Transmission Range

Data

First Gear/Second Gear/Third Gear/Fourth Gear/Fifth Gear/Park/Reverse/Neutral/Drive/Invalid

Park

Vehicle Speed

Data

km/h (mph)

0 km/h (0 mph)

Powertrain Control Module (PCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine Idling/Normal Operating Temperature

Cruise Control Active

IPC Data

Yes/No

No

Engine Speed

Engine Data

EGR Data

EVAP Data

Fuel Trim Data

HO2S Data

Ignition Data

Misfire Data

TAC Data

Cooling/HVAC Data

Cruise/Traction Data

Electrical/Theft Data

IPC Data

RPM

100 RPM from Desired Idle Speed

ECT Sensor

Engine Data

EGR Data

EVAP Data

Fuel Trim Data

HO2S Data

Ignition Data

Misfire Data

TAC Data

Cooling/HVAC Data

IPC Data

Celsius (Fahrenheit)

85-105°C (185-220°F)

Engine Oil Life Remaining

IPC Data

%

Varies

Engine Oil Pressure Switch

Engine Data

IPC Data

OK/Low

OK

Fuel Tank Level Remaining

EVAP Data

IPC Data

%

Varies

Fuel Level Sensor

EVAP Data

IPC Data

Volts

Varies

Generator Lamp Command

IPC Data

On/Off

Off

Ignition 1 Signal

Engine Data

EGR Data

EVAP Data

Fuel Trim Data

HO2S Data

Ignition Data

Misfire Data

TAC Data

Output Driver Data

Cooling/HVAC Data

Cruise/Traction Data

Electrical/Theft Data

IPC Data

Volts

9-16 V (Varies)

MIL Circuit History

IPC Data

OK/Open/Short/Invalid State

OK

MIL Command

Engine Data

EGR Data

EVAP Data

Ignition Data

IPC Data

On/Off

Off

Vehicle Speed Sensor

Engine Data

EGR Data

EVAP Data

Fuel Trim Data

HO2S Data

Ignition Data

Misfire Data

TAC Data

Cooling/HVAC Data

IPC Data

km/h (mph)

0 km/h (0 mph)