GM Service Manual Online
For 1990-2009 cars

Chassis Data

Scan Tool Parameter

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN Position, Engine OFF, All Doors Closed, DRLs OFF

Battery 1

Volts

Varies

Brake Fluid Level

Volts

Varies

Brake Fluid Level Status

Normal/Open Ckt.

Normal

BTSI

Unlocked/Locked

Locked

Coolant Level

Low/OK

OK

Park Brake Switch

On/Off

OFF

Traction Switch

On/Off

OFF

Traction Switch LED

On/Off

ON

Wiper/Washer

Scan Tool Parameter

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN Position, Engine OFF, All Doors Closed, DRLs OFF

Battery 1

Volts

Varies

Washer Switch

On/Off

OFF

Wiper Ground

On/Off

OFF

Wiper Park Switch

On/Off

ON

Wiper Replay Cmd.

On/Off

OFF

Wiper Switch

Volts

Varies

Wiper Switch State

On/Off

OFF

Door Lock Data

Scan Tool Parameter

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN Position, Engine OFF, All Doors Closed, DRLs OFF

Battery 1

Volts

Varies

Decoded Switch State

Lock/Unlock/Off

OFF

Door Lock Switch

Volts

Varies

Driver Door Switch

Open/Closed

Closed

Driver Door Unlock Fdbk.

On/Off

OFF

Fob ID

None/Fob1/Fob2

Varies

Lock All Doors Fdbk.

On/Off

OFF

Pass Door Switches

Open/Closed

Closed

RKE Lock Button

On/Off

Varies

RKE Low Battery

Yes/No

Varies

RKE Panic Button

On/Off

Varies

RKE Trunk Button

On/Off

Varies

RKE Unlock Button

On/Off

Varies

Trunk Release

On/Off

OFF

Unlock All Doors Fdbk.

On/Off

Off

Security Data

Scan Tool Parameter

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN Position, Engine OFF, All Doors Closed, DRLs OFF

Auto. Learn Timer

Seconds

Varies

Battery 1

Volts

Varies

CTD Security LED Request

On/Off/Flash

OFF

Horn Relay

On/Off

OFF

Last Alarm Cause

Default/Driver Door/Pass Door/Trunk/Power Mode

Default

Lockout Timer Status

Seconds

Varies

Passlock Data Voltage

Volts

Varies

Passlock Telltale

On/Off

OFF

Security LED

On/Off

OFF

Seed and Key Timer

Seconds

Varies

Theft Previously Alarmed

Yes/No

No

Theft System Status

Disabled/Disarmed/Pre-Arm/Armed/Alarm/Passive Arm

Disarmed

2nd to Last Alarm Cause

Default/Driver Door/Pass Door/Trunk/Power Mode

Default

3rd to Last Alarm Cause

Default/Driver Door/Pass Door/Trunk/Power Mode

Default

Exterior Lamps

Scan Tool Parameter

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN Position, Engine OFF, All Doors Closed, DRLs OFF

ALC Headlamp Relay

On/Off

OFF

ALC Parklamp Relay

On/Off

OFF

ALC Light Sensor

Volts

Varies

ALC Switch

On/Off

ON

Battery 1

Volts

Varies

Day/Night Status

Day/Night/Off/Delay Off

Night

DRL Status

 

Not Allowed

Fob Lamp Relay

On/Off

OFF

Fog Lamp Switch

On/Off

OFF

High Beam Switch

On/Off

OFF

LF Turn Signal

On/Off

OFF

LR Turn Signal

On/Off

OFF

Low Beam Switch

On/Off

OFF

Park Lamp Switch

On/Off

OFF

RF Turn Signal

On/Off

OFF

RR Turn Signal

On/Off

OFF

Turn/Hazard Input

Volts

Varies

Interior Lamps

Scan Tool Parameter

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN Position, Engine OFF, All Doors Closed, DRLs OFF

Battery 1

Volts

Varies

Inadvertent Power Cmd.

On/Off

ON

Inadvertent Power Input

On/Off

ON

Interior Lighting Cmd.

%

Varies

Interior Lighting Relay

On/Off

OFF

I/P Dimmer Input

Volts

Varies

I/P Dimmer Output

%

Varies

HVAC Data

Scan Tool Parameter

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN Position, Engine OFF, All Doors Closed, DRLs OFF

A/C Switch

On/Off

Varies

Battery 1

Volts

Varies

Rear Defog Relay Cmd.

On/Off

OFF

Rear Defog Switch

On/Off

OFF

Ignition

Scan Tool Parameter

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN Position, Engine OFF, All Doors Closed, DRLs OFF

Accessory

On/Off

ON

Battery 1

Volts

Varies

Ignition Accessory

Active/Inactive

Active

Ignition Mode Switch

Volts

Varies

Ignition Run/Crank

High/Low

High

Key in Ignition

Yes/No

YES

Power Mode

Crank/Run/Accessory/Off

RUN

Run/Crank Relay Command

On/Off

ON

Chime Data

Scan Tool Parameter

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN Position, Engine OFF, All Doors Closed, DRLs OFF

Battery 1

Volts

Varies

Chime State

No Request/ON/On Queued/Off Queued

No Request

Last Chime Active

Seat Belt/Key In/Oil Reset/Delayed Lock/Head Lamp/Park Brake/Check Gauges/Turn Signal

Seat Belt