GM Service Manual Online
For 1990-2009 cars only

Immobilizer

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Antenna 1 Status

Inputs

Normal/Out of Range

Normal

Battery Voltage

Inputs

Normal/Out of Range

Normal

ECM/Immobilizer Status

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Normal/Error

Normal

Ignition

Inputs

On/Off

On

Immobilizer State

Powertrain Status

Locked/Unlocked

Locked

Key in Ignition

Inputs

Yes/No

Yes

Key in Ignition

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Master Key/Sub Key/Unknown Key

Master Key

Master Keys Learned

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Counts

Varies

Password Status

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Valid/Invalid

Valid

Starter Inhibit

Powertrain Status

Active/Inactive

Active

Total Keys Learned

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Counts

Varies

Transponder Key

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Normal/Error

Normal