GM Service Manual Online
For 1990-2009 cars only

Amplifier (AMP)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Running

Battery Voltage Signal

Engine Electrical

Volts

13.9 Volts

Body Control Module (BCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Running

Battery Voltage Signal

Engine Electrical

Volts

13.9 Volts

Ignition Mode Switch

Engine Electrical

Volts

13.9 Volts

Column Lock Module (CLM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Running

Battery Voltage Signal

Engine Electrical

Volts

13.9 Volts

Driver Position Module (DPM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Running

Battery Voltage Signal

Engine Electrical

Volts

13.9 Volts

Engine Control Module (ECM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF

Crank Request Signal

Engine Electrical

Yes/No

No

GEN F-Terminal Signal

Engine Electrical

%

0%

GEN L-Terminal Signal Command

Engine Electrical

On/Off

Off

Ignition 1 Signal

Engine Electrical

Volts

12.6 Volts

Starter Relay Command

Engine Electrical

On/Off

Off

Starter Relay Control Circuit

Engine Electrical

OK/Fault

OK

Folding Top Controller (FTC)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Running

Battery Voltage Signal

Engine Electrical

Volts

13.9 Volts

Heating Ventalation Air Conditioning (HVAC)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Running

Battery Voltage Signal

Engine Electrical

Volts

13.9 Volts

On Star (ONS)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Running

Battery Voltage Signal

Engine Electrical

Volts

13.9 Volts

Sensing Diagnostic Module(SDM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Running

Battery Voltage Signal

Engine Electrical

Volts

13.9 Volts

Transmission Control Module (TCM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Transmission in Park

IMS

Engine Electrical

Park, Park/Reverse, Reverse, Reverse/Neutral, Neutral, Neutral/Drive 4, Drive 4, Drive 4/Drive 3, Drive 3, Drive 3/Drive 2, Drive 2, Drive 2/Drive 1, Drive 1, INVALID, OPEN

Park