GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Vehicle Theft Deterrent (VTD) System check?

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Go to Step 2

Go to Vehicle Theft Deterrent (VTD) System Check

2

  1. Listen to and touch the THFT 1 and the THFT 2 relays in the underhood junction block.
  2. Cycle the ignition switch from RUN to START repeatedly.

Do the relays actuate?

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Go to Starting System Check in Engine Electrical

Go to Step 3

3

Inspect the PASS-Key  III module.

Was the PASS-Key  III module replaced recently?

--

Go to Step 5

Go to Step 4

4

Replace the PASS-Key® III module. Refer to Theft Deterrent Module Replacement .

Did you complete the repair?

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Go to Vehicle Theft Deterrent (VTD) System Check

Go to Step 5

5

Reprogram the original powertrain control module (PCM). Refer to Powertrain Control Module Replacement/Programming in Engine Controls.

Is the symptom still present?

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Go to Step 6

Go to Vehicle Theft Deterrent (VTD) System Check

6

Replace the PCM. Refer to Powertrain Control Module Replacement/Programming in Engine Controls.

Did you complete the repair?

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Go to Vehicle Theft Deterrent (VTD) System Check

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