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)
Table 4: Radio

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

On/Off

Off

Courtesy Lamp Relay

Outputs

On/Off

Off

Courtesy Lamp Switch

Inputs

On/Off

Off

Driver Door Ajar Sw

Inputs

On/Off

Off

Driver Seatbelt

Inputs

Unbuckled/Buckled

Unbuckled

Hazard Lamp Switch

Inputs

Active/Inactive

Inactive

Headlamp Off Switch

Inputs

Active/Inactive

Inactive

Headlamp On Switch

Inputs

On/Off

Off

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

Set/Released

Released

Park Lamp Signal

Outputs

On/Off

Off

Park Lamp Switch

Inputs

Active/Inactive

Inactive

Passenger Door Ajar Sw

Inputs

On/Off

Off

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 1

Engine Data 2

Engine Data 3

EVAP Data

Fuel Trim Data

Misfire Data

Celsius (Fahrenheit)

85-105°C (185-220°F)

Engine Oil Level Switch

Engine Data 3

OK/Low

OK

Engine Oil Pressure Switch

Engine Data 3

OK/Low

OK

Engine Speed

Engine Data 1

Engine Data 2

Engine Data 3

EVAP Data

Fuel Trim Data

Misfire Data

RPM

±100 RPM from desired idle speed

Fuel Level Sensor

Engine Data 1

EVAP Data

Percent

0-100%

(Varies)

Fuel Level Sensor

Engine Data 1

Voltage

0-5 V (Varies)

Ignition 1 Signal

Engine Data 1

Engine Data 2

Engine Data 3

EVAP Data

Fuel Trim Data

Voltage

12.2 V

(Varies)

MIL (Malfunction Indicator Lamp) Command

Engine Data 1

On/Off

Off

Reduced Engine Power

Engine Data 1

Engine Data 3

Active/Inactive

Inactive

Vehicle Speed Sensor

Engine Data 1

Engine Data 2

Engine Data 3

EVAP Data

Fuel Trim Data

Misfire Data

km/h (mph)

0 km/h (0 mph)

Radio

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN, Radio ON

Balance

Data

Value

-50 to +50

Battery Voltage

Data

Volts

0-18 V

Fade

Data

Value

-50 to +50

Volume

Data

Percent

0-100%