GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Cavalier 🢒 Body and Accessories 🢒 Theft Deterrent 🢒 Content Theft Deterrent (CTD) System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

Turn the ignition switch to OFF for 5 seconds.

The engine is off.

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2

Observe the THEFT SYSTEM indicator.

The THEFT SYSTEM indicator is illuminated.

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3

Turn the ignition switch to RUN.

The SDL Monitor Mode displays the following settings:

Instrument Cluster to PCM

    • The VTD Moding function is NOT SET.
    • The Reverse Rotate function is INACTIVE.
    • The VTD Password function indicates NOT RECEIVE.

PCM to Instrument Cluster

    • The VTD Acknowledge function indicates NO.
    • The VTD Tamper function is INACTIVE.
    • The Reference Sync function indicates NOT SYNC.

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4

For automatic transaxle, place the gear selector in PARK.

For manual transaxle, depress the clutch pedal in order to close the clutch start switch.

The THEFT SYSTEM indicator is illuminated.

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5

Turn the ignition switch to START.
    • The engine cranks.
    • The SDL Monitor Mode displays the following settings:

Instrument Cluster to PCM

      • The VTD Moding function is NOT SET.
      • The Reverse Rotate function is ACTIVE.
      • The VTD Password function indicates NOT RECEIVE.

PCM to Instrument Cluster

      • The VTD Acknowledge function indicates NO.
      • The VTD Tamper function is INACTIVE.
      • The Reference Sync function indicates NOT SYNC.

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6

After the engine starts, turn the ignition switch to RUN.
    • The engine runs.
    • The THEFT SYSTEM indicator turns off.
    • The SDL Monitor Mode displays the following settings:

Instrument Cluster to PCM

      • The VTD Moding function is SET.
      • The Reverse Rotate function is INACTIVE.
      • The VTD Password function indicates RECEIVE.

PCM to Instrument Cluster

      • The VTD Acknowledge function indicates YES.
      • The VTD Tamper function is INACTIVE.
      • The Reference Sync function indicates SYNC.

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7

Turn the ignition switch to OFF.
    • The engine stops.
    • There is no UART communication.

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* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.