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 of 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 in Vehicle DTC Information.

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/Park Brake Unapplied

Battery Voltage Signal

Data

Volts

12.2 V

Cargo Lamp Switch

Inputs

Active/Inactive

Inactive

Courtesy Lamp Output

Outputs

On/Off

Off

Courtesy Lamp Switch

Inputs

Active/Inactive

Inactive

Driver Door Ajar Sw

Inputs

Door Ajar/Door Closed

Door Closed

Hazard Lamp Switch

Inputs

Active/Inactive

Inactive

Headlamp Off Switch

Inputs

Active/Inactive

Inactive

Headlamp On Switch

Inputs

Active/Inactive

Inactive

Headlamp Relay

Outputs

On/Off

Off

High Beam Indicator Command

Outputs

On/Off

Off

High Beam Select Switch

Inputs

Active/Inactive

Inactive

Ignition Accessory

Inputs

Active/Inactive

Active

Ignition 1 Run/Crank

Inputs

Active/Inactive

Active

Ign. Off/Run/Crank

Inputs

Active/Inactive

Active

LF Turn/Hazard Lamp Command

Outputs

On/Off

Off

LR Turn/Hazard Lamp Command

Outputs

On/Off

Off

Park Brake Switch

Inputs

Applied/Released

Released

Park Lamp Signal

Outputs

On/Off

Off

Park Lamp Switch

Inputs

On/Off

Off

Passenger Door Ajar Sw

Inputs

Door Ajar/Door Closed

Door Closed

RF Turn/Hazard Lamp Command

Outputs

On/Off

Off

RR Turn/Hazard Lamp Command

Outputs

On/Off

Off

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

Battery Voltage

Data

Voltage

12.2 V

(Varies)

Engine Coolant Temperature

Data

Celsius (Fahrenheit)

Varies

Engine Speed

Data

RPM

0 RPM

Fuel Level

Data

%

Varies

PRNDL Switch

Inputs

Park, Reverse, Neutral, Drive, 3rd, 2nd, 1st

Park

Trip Odometer

Data

kilometers (miles)

Varies

Trip Reset Switch

Inputs

Active/Inactive

Inactive

Vehicle Speed

Data

kilometers per hour (miles per hour)

0 mph (0 km/h)

Powertrain Control Module (PCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine Idling/Normal Operating Temperature

ECT Sensor

Engine Data

EVAP Data

Fuel Trim Data

HO2S Data

Ignition Data

Misfire Data

TAC Data

IPC Data

Celsius (Fahrenheit)

85-105°C (185-220°F)

Engine Oil Life Remaining

IPC Data

Percent

0-100%

(Varies)

Engine Oil Pressure Switch

Engine Data

Misfire Data

IPC Data

OK/Low

OK

Engine Speed

Engine Data

EVAP Data

Fuel Trim Data

HO2S Data

Ignition Data

Misfire Data

Cruise Control Data

TAC Data

HVAC Data

IPC Data

RPM

±100 RPM from desired idle speed

Fuel Level Sensor

EVAP Data

IPC Data

Voltage

0-5 V (Varies)

Fuel Tank Level Remaining

Engine Data

Misfire Data

IPC Data

Percent

0-100%

(Varies)

Ignition 1 Signal

Engine Data

EVAP Data

Fuel Trim Data

H2OS Data

Ignition Data

Misfire Data

Cruise Control Data

TAC Data

Electrical/Theft Data

HVAC Data

IPC Data

Voltage

12.2 V

(Varies)

MIL (Malfunction Indicator Lamp) Command

Engine Data

EVAP Data

Ignition Data

IPC Data

On/Off

Off

Reduced Engine Power

TAC Data

IPC Data

Active/Inactive

Inactive

Vehicle Speed Sensor

Engine Data

EVAP Data

HO2S Data

Ignition Data

Misfire Data

Cruise Control Data

TAC Data

HVAC Data

IPC Data

km/h (mph)

0 km/h (0 mph)