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)/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

Cruise Control Switch

Cruise Control Data

Cancel/Off/On/Resume/Set/Error

Off

Driver Door Ajar Switch

Doors Data

Door Closed/Door Ajar

Door Closed

Key In Ignition Cylinder Status

Power Mode Data

Key Out/Key In

Key Out

Park Lamp Switch

Exterior Lighting Data

Active/Inactive

Inactive

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

IPC

Volts

Varies

Brake Fluid

IPC

Ok/Low

Ok

Brake Fluid Switch

IPC

Volts

Off

DIC Fuel Info.

IPC

Active/Inactive

Inactive

DIC Information Switch

IPC

Active/Inactive

Inactive

DIC Personalization

IPC

Active/Inactive

Inactive

Heated Washer Fluid Indicator Signal

IPC

Active/Inactive

Inactive

Ignition 1 Input

IPC

Active/Inactive

Active

Ignition Cycle Counter

IPC

Counts

Varies

Passenger Seatbelt Indicator Command

IPC

Off/On

Off

Passenger Seatbelt Indicator Status

IPC

Off/On

Off

Trip Reset Switch

IPC

Active/Inactive

Inactive

Washer Fluid Level

IPC

Ok/Low

Ok

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

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine Idling/Normal Operating Temperature

Cruise Control Active

ECM IPC Data

No/Yes

No

Change Engine Oil Indicator Command

ECM IPC Data

Off/On

Off

ECT Sensor

PCM/ECM IPC Data

Celsius (Fahrenheit)

85-105°C (185-220°F)

Engine Oil Level Switch

ECM IPC Data

Ok/Off

Off

Engine Oil Life Remaining

PCM IPC Data

%

0-100%

Varies

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

Varies

Fuel Tank Level Remaining

ECM/PCM IPC Data

%

0-100%

Varies

Generator Lamp Command

PCM IPC Data

Off/On

Off

Ignition 1 Signal

ECM/PCM IPC Data

Volts

Varies

Ignition Accessory Signal

ECM IPC Data

Off/On

Off

Low EOP Indicator Command

ECM IPC Data

Off/On

Off

Low Engine Oil Level Indicator Command

ECM IPC Data

Off/On

Off

MIL Circuit Status

PCM IPC Data

Ok/Open/Short/Invalid State

Ok

MIL Circuit Status

ECM IPC Data

Incomplete/Short GND/Open/Short B+/Ok

Ok

MIL Command

ECM/PCM IPC Data

Off/On

Off

Vehicle Speed Sensor

ECM/PCM IPC Data

kph (mph)

0 kph (0 mph)