GM Service Manual Online
For 1990-2009 cars only

Parameter

Operating Conditions

Expected Value

Definition

Ignition is ON, engine OFF, and vehicle is stationary

Battery Reconnect

--

Yes

The scan tool displays Yes or No to indicate a battery reconnect. This is used for substitution detection to determine if a check needs to be made for substituted parts.

--

No

Engine Start Disable

Engine start disable activated

Yes

The scan tool displays Yes or No to indicate if the engine start disable has been activated or not.

Engine start disable deactivated

No

Ignition Voltage Status

Ignition voltage present

Active

The scan tool displays Active or Inactive to indicate if the ignition voltage is present or not.

Ignition voltage not present

Inactive

Immobilisation

Immobilisation activated

Active

The scan tool displays Active or Inactive to indicate the status of the immobilisation.

Immobilisation deactivated

Inactive

Invalid Transponder Key

Invalid transponder key detected

Yes

The scan tool displays Yes or No to indicate if a invalid transponder key is detected or not.

Valid transponder key detected

No

Substitution Detection

No substitution detected

Passed

The scan tool displays Passed or Failed for the substitution detection system.

Substitution detected

Failed

System Power Mode

Ignition is in OFF position

Off

This parameter displays Off/Accessory/Run/Crank. This is the status of the system power mode dependent on the ignition position.

Ignition is in ACC position

Accessory

Ignition is in RUN position

Run

Ignition is in CRANK position

Crank

Tamper Status

Tamper state activated

Active

The scan tool displays whether the theft module is in the tamper state.

Tamper state deactivated

Inactive

Theft Deterrent DTC

--

Present

The scan tool displays Present or Not Present to indicate whether a DTC has been logged or not.

--

Not Present

Theft Deterrent Status

--

Lrn Keys Stdby

This is dependent on the position of the ignition key.

--

Wake up

--

Monitor Key

Theft Deterrent Telltail

Theft deterrent telltail activated

On

The scan tool displays On if the theft deterrent system has been activated.

Theft deterrent telltail deactivated

Off

Transponder Key ID Error

Key ID does not match the theft module

Yes

The scan tool will display Yes if the key ID does not match the theft module.

Key ID does match the theft module

No

Transponder Key Number

--

1

The scan tool displays 1/2/3/4. depending on what key is in the ignition.

--

2

--

3

--

4

Transponder Key Programmed

--

1/2/3/4

The scan tool displays the number of transponder keys programmed.

Valid Transponder Key

Valid transponder key present

Yes

The scan tool displays Yes if a valid transponder key is present.

Invalid transponder key present

No

VIN Message Received

VIN message received

Yes

The scan tool displays Yes or No to indicate whether a VIN message has been received or not.

VIN message not received

No

VIN Received

--

Yes

The scan tool displays Yes or No to indicate when the VIN has been received or not.

--

No

VIN Valid

Valid VIN

Yes

The scan tool displays Yes or No to indicate when a VIN is valid or not.

Invalid VIN

No

Wrong Transponder Key

Wrong transponder key used

Yes

The scan tool displays Yes or No to indicate if the wrong transponder key is used or not.

Correct transponder key used

No