GM Service Manual Online
For 1990-2009 cars only

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

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

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 Circuit Status

ECM, Data Display, Electrical/Theft Data

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

OK

GEN L-Terminal Signal Command

ECM, Data Display, Electrical/Theft Data

On/Off

Off

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

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

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

Park