GM Service Manual Online
For 1990-2009 cars only

Vehicle Control Systems Data

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON, Engine OFF

Accessory Relay Command

Data

On/Off

On

Battery Voltage Signal

Data

Volts

13.5

Ignition Mode Switch

Data

Volts

4.02

Ignition Switch Accessory

Data

Active/Inactive

Active

Ignition Switch Run/Crank Signal

Data

On/Off

On

Key In Ignition Cylinder

Data

Yes/No

Yes

Power Mode

Data

Run, Accessory, Crank Request

Run

Run Crank Relay Command

Data

On/Off

On

Run Relay Command

Data

On/Off

On