GM Service Manual Online
For 1990-2009 cars only

Theft Deterrent Module (TDM)

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition ON, Engine OFF

Auto Learn Counter

TDM Data

Counts

Varies

Auto Learn Timer

TDM Data

Minutes

Varies

Autolearn

Learn Key Data

Enabled/Disabled

Varies

Battery Voltage

TDM Data

Volts

Varies

Ignition Voltage

TDM Data

Volts

Varies

Learned Key Required

Learn Key Data

1/2

Varies

Master Keys Learned

Learn Key Data

Counts

Varies

PCM Auto Learn Timer

Powertrain Status

Active/Inactive

Inactive

PCM Fail Enable

Powertrain Status

Active/Inactive

Varies

PCM Fuel Continue

Powertrain Status

Active/Inactive

Varies

PCM Password Learning

Powertrain Status

Active/Inactive

Disabled

PCM Password Status

TDM Data

Undecided/Tamper/Valid/No Info

Varies

Power Mode

TDM Data

Off/Accessory/Run/Crank Request

Run

Previous TDM State

TDM Data

Asleep/Wakeup/Normal/Learn Passkey/Tamper/Monitor Key/Fail Pending/Lrn Keys Stdby/Learn More Keys/Learn Pending/Auto Learn/Auto Lrn Done/No Coded Key

Varies

Telltale Status

TDM Data

Off/On/Flash/Invalid

Off

Tamper Status

TDM Data

Active/Inactive

Inactive

TDM State

TDM Data

Asleep/Wakeup/Normal/Learn Passkey/Tamper/Monitor Key/Fail Pending/Lrn Keys Stdby/Learn More Keys/Learn Pending/Auto Learn/Auto Lrn Done/No Coded Key

Normal

Total Keys Learned

Learn Key Data

Counts

Varies

Transponder Key

Learn Key Data

Present/Not Present

Present

Valid Key

Learn Key Data

Yes/No

Yes