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)/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 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 Signal

Keyless/Remote Start Data

Volts

Varies

Brake Fluid Level Sensor

Chassis Data

Low/Ok

Ok

DIC Switch

Chassis Data

Clear/Menu/Info/Reset

Clear

Driver Door Ajar Switch

Keyless/Remote Start Data

Door Closed/Door Ajar

Door Closed

Key In Ignition Cylinder Switch

Keyless/Remote Start Data

Yes/No

Yes

Headlamp Off Switch

Lighting Data

Off/On

Off

Headlamp On Switch

Lighting Data

Off/On

Off

Park Lamp Switch

Lighting Data

Off/On

Off

Trunk Ajar Switch

Keyless/Remote Start Data

Trunk Closed/Trunk Ajar

Trunk Closed

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

Chime

IPC Data

Off/On

Off

DIC Information Switch

IPC Data

Inactive/Active

Inactive

DIC Switch Input

IPC Data

Volts

Varies

Ignition 1 Input

IPC Data

Inactive/Active

Active

Menu Switch

IPC Data

Off/On

Off

Reset Switch

IPC Data

Inactive/Active

Inactive

Engine Control Module (ECM)/Powertrain Control Module (PCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine Idling/Normal Operating Temperature

Cruise Control Active

ECM/PCM IPC Data

Yes/No

No

ECT Sensor

ECM/PCM IPC Data

Celsius (Fahrenheit)

Varies

8 -105°C (185-220°F)

Engine Oil Level Switch

ECM IPC Data

Ok/Low

Ok

Engine Oil Pressure Switch

ECM/PCM IPC Data

OK/Low

OK

Engine Oil Temperature Calculated

ECM IPC Data

Celsius (Fahrenheit)

Varies w/oil temperature

Engine Speed

ECM/PCM IPC Data

RPM

±100 RPM from Desired Idle Speed

Fuel Level Sensor

ECM/PCM IPC Data

Volts

0-5 Volts

Varies w/fuel level

Fuel Tank Level Remaining

ECM/PCM IPC Data

Percent (%)

0-100%

Varies w/fuel level

Ignition Accessory Signal

ECM/PCM IPC Data

On/Off

Off

Ignition 1 Signal

ECM/PCM IPC Data

Volts

9-16 Volts

Varies

MIL Command

ECM/PCM IPC Data

On/Off

Off

Non-Driven Wheel Speed

ECM IPC Data

km/h (mph)

0 km/h (0 mph)

Odometer

ECM IPC Data

kilometers (miles)

Varies

Reduced Engine Power

ECM/PCM IPC Data

Inactive/Active

Inactive

Vehicle Speed Sensor

ECM/PCM IPC Data

km/h (mph)

0 km/h (0 mph)