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

Data

Volts

13.9 Volts

Digital Radio Receiver (DRR)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

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

Ignition ON/Engine Running

Battery Voltage

Data Display

Volts

13.9 Volts

Drivers Door Module

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Running

Battery Voltage

Data Display

Volts

13.9 Volts

Engine Control Module (ECM) 3.6L (LY7)

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

%

Varies

Ignition 1 Signal

Engine Electrical

On/Off

On

PNP Switch

Engine Electrical

Park / Neutral / In Gear

Park

Starter Relay Command

Engine Electrical

On/Off

Off

Starter Relay Circuit Status

Engine Electrical

Fault / Indeterminate / OK

OK

Engine Control Module (ECM) 4.4L (LC3)

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

%

Varies

GEN L-Terminal Circuit Status

Engine Electrical

Incomplete / Short Gnd / Open / Short to B+ / OK

OK

Ignition 1 Signal

Engine Electrical

Volts

Varies

PNP Switch

Engine Electrical

Park / Neutral / In Gear

Park

Starter Relay Command

Engine Electrical

On/Off

Off

Starter Relay Circuit Status

Engine Electrical

Incomplete / Short Gnd / Open / Short to B+ / OK

OK

Engine Control Module (ECM) 4.6L (LH2)

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

Varies

PNP Switch

Engine Electrical

Park / Neutral / In Gear

Park

Starter Relay Command

Engine Electrical

On/Off

Off

Starter Relay Circuit Status

Engine Electrical

Fault / Indeterminate / OK

OK

Instrument Panel Cluster (IPC)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Running

Battery Voltage Signal

Data Display

Volts

13.9 Volts

Instrument Panel Module (IPM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Running

Battery Voltage Signal

Data Display

Volts

13.9 Volts

Left Rear Door Module

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Running

Battery Voltage Signal

Data Display

Volts

13.9 Volts

Memory Seat Module (MSM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Running

Battery Voltage Signal

Data Display

Volts

13.9 Volts

Right Rear Door Module

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Running

Battery Voltage Signal

Data Display

Volts

13.9 Volts

Rear Integration Module (RIM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Running

Battery Voltage Signal

Data Display

Volts

13.9 Volts

Rear Seat Module

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Running

Battery Voltage Signal

Data Display

Volts

13.9 Volts

Vehicle Theft Deterrent (VTD)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition Cranking

Battery Voltage Signal

Data Display

Volts

12.0 Volts

Start Disabled

Data Display

Yes/No

Yes

Passenger Door Module

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine Running

Battery Voltage Signal

Data Display

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

Data Display

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