GM Service Manual Online
For 1990-2009 cars only

Amplifier (AMP)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine Running

Battery Voltage

Data Display

Volts

13.9 Volts

Body Control Module (BCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine Running

Battery Low at Start

Data Display/ Charging Info

Yes/No

No

Batt. Open Ckt. Tested

Data Display/ Charging Info

Yes/No

No

Batt. Open Ckt. Voltage

Data Display/ Charging Info

Volts

13.03 Volts

Battery Voltage

Data Display/ Charging Info

Volts

13.9 Volts

Batt. Voltage High Res.

Data Display/ Charging Info

Volts

12.417 Volts

Parasitic Current

Data Display/ Charging Info

Amps

0.0 Amps

Prev. State of Charge

Data Display/ Charging Info

%

90%

Start Up State of Charge

Data Display/ Charging Info

%

80%

State of Charge

Data Display/ Charging Info

%

85%

State of Charge Low

Data Display/ Charging Info

Yes/No

No

Digital Radio Receiver (DRR)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine Running

Battery Voltage

Data Display

Volts

13.9 Volts

Drivers Door Switch

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine Running

Battery Voltage Signal

Data Display/Data

Volts

13.9 Volts

Electronic Brake Control Module (EBCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine Running

Battery Voltage Signal

Data Display/ABS Data

Volts

13.9 Volts

Electronic Suspension Control (ESC) Module

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine Running

Battery Voltage Signal

Data Display

Volts

13.9 Volts

Engine Control Module (ECM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine OFF

Crank Request Signal

ECM, Data Display, Electrical/Theft Data

Yes/No

No

EPM Inhibit Reason

ECM, Data Display, Electrical/Theft Data

None, DLC Override, Fuel Demand, OBD Demand, MAF Demand, Deact Demand, TCM Demand

None

GEN F-Terminal Signal

ECM, Data Display, Electrical/Theft Data

%

0%

GEN L-Terminal Command

ECM, Data Display, Electrical/Theft Data

%

0%

Ignition 1 Signal

ECM, Data Display, Electrical/Theft Data

Volts

Varies

Ignition Accessory Signal

ECM, Data Display, Electrical/Theft Data

On/Off

On

PNP Switch (If Equipped)

ECM, Data Display, Electrical/Theft Data

Park/Neutral/In Gear

Park

Starter Relay Command

ECM, Data Display, Electrical/Theft Data

On/Off

Off

Instrument Panel Cluster (IPC)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON/Engine Running

Battery Voltage

Data Display

Volts

13.9 Volts

Liftgate Module

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions : Ignition ON/Engine Running

Battery Voltage Signal

Data Display/Data

Volts

13.9 Volts

Park Assist Module

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions : Ignition Cranking

Battery Voltage

Data Display/Battery Data

Volts

13.9 Volts

Passenger Door Switch

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions : Ignition ON/Engine Running

Battery Voltage Signal

Data Display/Data

Volts

13.9 Volts

Supplemental Inflatable Restraint

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions : Ignition ON/Engine Running

Battery Voltage Signal

Data Display/Data

Volts

13.9 Volts

Transmission Control Module (TCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions : Ignition ON/Transmission in Park

TR Sw.

Engine Electrical

Park, Reverse, Neutral, Drive 5, Drive 4, Drive 3, Drive 2, Drive 1

Park

Theft Deterrent Module (TDM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition Cranking

Ignition Voltage Signal

Data Display/TDM Data

Present/Not Present

Present

Start Disabled

Data Display/TDM Data

Yes/No

Yes