GM Service Manual Online
For 1990-2009 cars only
Table 1: Accessory
Table 2: Switch Inputs
Table 3: Exterior Lamps
Table 4: Interior Lamps
Table 5: Door Locks
Table 6: Wiper/Washer
Table 7: Security Data

Accessory

Scan Tool Parameter

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN, Engine OFF, All Doors Closed, Park Brake Applied (DRLs OFF)

A/C Sensor

Volts

Varies

Afterblow Relay Cmd.

On/Off

Off

Afterblow Relay Fdbk.

High/Low

Low

Battery 1

Volts

Varies

Coolant Gauge Position

% of Gauge

%

Fuel Gauge Position

% of Full

%

Odometer

km/miles

Varies

Rear Defog Relay Cmd.

On/Off

Off

Rear Defog Relay Fdbk.

High/Low

High

Rear Defog Switch

On/Off

Off

Shifter Unlock Cmd.

On/Off

On

Shifter Unlock Fdbk.

High/Low

Low

Switch Inputs

Scan Tool Parameter

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN, Engine OFF, All Doors Closed, Park Brake Applied (DRLs OFF)

A/C Request (Manual A/C)

Yes/No

No

Battery 1

Volts

Varies

Driver Door Switch

High/Low

High

Fog Lamp Switch

On/Off

Off

Front Wiper Delay Switch

On/Off

Off

High Beam Switch

On/Off

On

Key In Ignition

Yes/No

Yes

Liftgate Ajar Switch

High/Low

High

Lock Switch

On/Off

Off

Low Beam Input = DRL

Yes/No

No

Low Beam Input = High

Yes/No

No

Low Beam Input = Off

Yes/No

Yes

Low Brake Fluid

Yes/No

No

Low Coolant

Yes/No

No

Oil Life Reset Switch

High/Low

High

Park Brake Switch

On/Off

On

Park Lamp Switch

On/Off

Off

Psgr. Door Switches

High/Low

High

Rear Defog Switch

On/Off

Off

Rear Wiper Switch

On/Off

Off

Unlock Switch

On/Off

Off

Exterior Lamps

Scan Tool Parameter

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN, Engine OFF, All Doors Closed, Park Brake Applied (DRLs OFF)

Battery 1

Volts

Varies

DRL Relay Cmd.

On/Off

Off

DRL Relay Fdbk.

High/Low

High

Fog Lamp Relay Cmd.

On/Off

Off

Fog Lamp Relay Fdbk.

High/Low

High

Fog Lamp Switch

On/Off

Off

High Beam Switch

On/Off

On

Low Beam Input

Volts

Varies

Low Beam Input = DRL

Yes/No

No

Low Beam Input = High

Yes/No

No

Low Beam Input = Off

Yes/No

Yes

Park Lamp Switch

On/Off

Off

Interior Lamps

Scan Tool Parameter

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN, Engine OFF, All Doors Closed, Park Brake Applied (DRLs OFF)

Battery 1

Volts

Varies

Dome Lamp Cmd.

On/Off

Off

Dome Lamp Fdbk.

High/Low

High

Driver Door Switch

High/Low

High

Inadvertent Power Cmd.

On/Off

On

Inadvertent Power Fdbk.

High/Low

High

I/P Dimmer Input

Volts

Varies

I/P Dimmer Output

% Duty Cycle

%

Key In Ignition

Yes/No

Yes

Psgr. Door Switches

High/Low

High

Door Locks

Scan Tool Parameter

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN, Engine OFF, All Doors Closed, Park Brake Applied (DRLs OFF)

Battery 1

Volts

Varies

Driver Unlock Relay Cmd.

On/Off

Off

Driver Unlock Relay Fdbk.

High/Low

Low

Lock All Relay Cmd.

On/Off

Off

Lock All Relay Fdbk.

High/Low

Low

Lock Switch

On/Off

Off

Psgr. Unlock Relay Cmd.

On/Off

Off

Psgr. Unlock Relay Fdbk.

High/Low

Low

Remote Lock Cmd.

Yes/No

No

Remote Panic Cmd.

Yes/No

No

Remote Unlock Cmd.

Yes/No

No

Unlock Switch

On/Off

Off

Wiper/Washer

Scan Tool Parameter

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN, Engine OFF, All Doors Closed, Park Brake Applied (DRLs OFF)

Battery 1

Volts

Varies

Front Washer Motor Input

On/Off

Off

Front Wiper Delay Relay Cmd.

On/Off

Off

Front Wiper Delay Relay Fdbk.

High/Low

High

Front Wiper Delay Switch

On/Off

Off

Rear Washer Motor Input

On/Off

Off

Rear Wiper Relay Cmd.

On/Off

Off

Rear Wiper Relay Fdbk.

High/Low

High

Rear Wiper Switch

On/Off

Off

Wiper Delay 1

Yes/No

Varies

Wiper Delay 2

Yes/No

Varies

Wiper Delay 3

Yes/No

Varies

Wiper Delay Input

Volts

Varies

Security Data

Scan Tool Parameter

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN, Engine OFF, All Doors Closed, Park Brake Applied (DRLs OFF)

Auto-Learn Timer

Seconds

Varies

Battery 1

Volts

Varies

Horn Relay Cmd.

On/Off

Off

Horn Relay Fdbk.

High/Low

High

Ignition 1 Input

High/Low

High

Ignition 2 Input

High/Low

High

Key Learned

Yes/No

No

Key Learn Enabled

Yes/No

Yes

Passlock Input

Volts

Varies

Passlock Power Fdbk.

High/Low

High

Passlock Timer

Seconds

Varies

Security LED

On/Off/Flash

Off