GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Vehicle Theft Deterrent (VTD) System check performed?

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Go to Step 2

Go to Vehicle Theft Deterrent (VTD) System Check

2

  1. Disconnect the theft deterrent (VTD) module.
  2. Use the digital multimeter (DMM) to measure the voltage at the harness connector terminal A to ground.

Does the voltage measure within specified range?

10-15 V

Go to Step 3

Go to Step 5

3

  1. Turn the ignition switch ON.
  2. Use the DMM to measure the voltage at the harness connector terminal E and ground.

Does the voltage measure within the specified range?

10-15 V

Go to Step 4

Go to Step 6

4

Use a DMM to measure the voltage across the harness connector terminal E and B.

Does the voltage measure within specified range?

10-15 V

Go to Step 8

Go to Step 7

5

Locate and repair an open or short in CKT 40 (ORN). Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Vehicle Theft Deterrent (VTD) System Check

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6

Locate and repair an open or short to ground in CKT 1020 (PNK). Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Vehicle Theft Deterrent (VTD) System Check

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7

Locate and repair an open or short to ground in CKT 351. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Vehicle Theft Deterrent (VTD) System Check

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8

Did you replace the VTD module?

--

Go to Step 10

Go to Step 9

9

Replace the VTD module. Refer to Theft Deterrent Module Replacement .

Refer to Programming Theft Deterrent System Components .

Did you complete the repair?

--

Go to Vehicle Theft Deterrent (VTD) System Check

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10

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

Does the PCM work correctly?

--

Go to Vehicle Theft Deterrent (VTD) System Check

Go to Step 11

11

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

Did you complete the repair?

--

Go to Vehicle Theft Deterrent (VTD) System Check

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