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

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 the 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/Seat Belt Buckled/High Beams OFF/Park Brake Unapplied

Ambient Air Temp. Sensor

HVAC Data

Volts

Varies

Battery Voltage

Keyless/Remote Start Data

Normal/Out of Range

Normal

Battery Voltage Signal

Power Mode

Volts

Varies

DIC Switch

Chassis Data

Menu/Reset

Menu

Door Ajar Switch

Keyless/Remote Start Data

Door Closed/Door Ajar

Door Closed

Driver Door Ajar Sw.

Keyless/Remote Start Data

Door Closed/Door Ajar

Door Closed

Key In Ignition Cylinder Switch

Power Mode

Yes/No

Yes

Headlamp Off Switch

Lighting Data

On/Off

Off

Headlamp On Switch

Lighting Data

On/Off

Off

Hazard Lamp Switch

Keyless/Remote Start Data

Lighting Data

On/Off

Off

High Beam Relay Command

Lighting Data

On/Off

Off

High Beam Select Switch

Lighting Data

Active/Inactive

Inactive

Hood Ajar Switch

Keyless/Remote Start Data

Closed/Ajar

Closed

Ignition Mode Switch

Power Mode

Volts

Varies

Ignition Switch Accessory Signal

Power Mode

Active/Inactive

Active

Left Turn Signal Switch

Lighting Data

Active/Inactive

Inactive

Liftgate Ajar Switch

Keyless/Remote Start Data

Closed/Ajar

Closed

Low Beam Relay Command

Lighting Data

On/Off

Off

Park Brake Switch

Lighting Data

Active/Inactive

Inactive

Park Lamp Switch

Lighting Data

On/Off

Off

Park Lamp Relay Cmd.

Lighting Data

On/Off

Off

Passenger Seat Belt Indicator Commanded

Lighting Data

On/Off

Off

Right Turn Signal Switch

Lighting Data

On/Off

Off

Security Indicator Command

Theft Information

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 Signal

IPC Data

Volts

Varies

DIC Information Switch

IPC Data

Active/Inactive

Inactive

DIC Switch Input

IPC Data

Volts

Varies

Ignition 1 Input

IPC Data

Active/Inactive

Active

Menu Switch

IPC Data

On/Off

Off

Reset Switch

IPC Data

Active/Inactive

Inactive

Engine Control Module (ECM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine Idling/Normal Operating Temperature

Cruise Control Active

TAC Data

Cruise Control Data

IPC Data

Yes/No

No

ECT Sensor

Engine Data

EVAP Data

Fuel Trim Data

HO2S

Ignition Data

Induction

Misfire Data

TAC Data

HVAC Data

IPC Data

Celsius (Fahrenheit)

Varies

85 - 105°C (185 - 220°F)

Engine Oil Life Remaining

IPC Data

Percent

0 - 100%

Engine Oil Pressure Switch

Engine Data

Misfire Data

IPC Data

OK/Low

OK

Engine Speed

Engine Data

EVAP Data

Fuel Trim Data

HO2S

Ignition Data

Induction

Misfire Data

TAC Data

Cruise Control Data

Theft Data

HVAC Data

IPC Data

RPM

±100 RPM from Desired Idle Speed

Fuel Level Sensor

EVAP Data

IPC Data

Volts

0 - 5 Volts

Varies w/fuel level

Fuel Pump Relay Command

Engine Data

On/Off

Off

Fuel Tank Level Remaining

Engine Data

EVAP Data

Misfire Data

IPC Data

Percent (%)

0 - 100%

Varies w/fuel level

Ignition Accessory Signal

IPC Data

On/Off

Off

Ignition 1 Signal

Engine Data

EVAP Data

Fuel Trim Data

HO2S

Ignition Data

Induction

Misfire Data

TAC Data

Cruise Control Data

Theft Data

HVAC Data

IPC Data

Volts

9 - 16 Volts

Varies

MIL Command

Engine Data

EVAP Data

Ignition Data

IPC Data

On/Off

Off

MIL Requested by DTC

Engine Data

EVAP Data

Ignition Data

Yes/No

No

Non-Driven Wheel Speed

Cruise Control Data

IPC Data

kph (mph)

0 kph (0 mph)

Reduced Engine Power

TAC Data

IPC Data

Active/Inactive

Inactive

Traction Control Status

Cruise Control Data

TAC Data

Active/Inactive

Inactive

Vehicle Speed Sensor

Engine Data

EVAP Data

HO2S

Ignition Data

Induction

Misfire Data

TAC Data

Cruise Control Data

HVAC Data

IPC Data

kph (mph)

0 kph (0 mph)