GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Content Theft Deterrent (CTD) System Check performed?

--

Go to Step 2

Go to Content Theft Deterrent (CTD) System Check

2

Using a scan tool, try to establish communications with the driver door module (DDM) and the vehicle theft deterrent (VTD) systems.

Can the scan tool communicate with the DDM and VTD systems?

--

Go to Step 3

Go to Step 9

3

Using the power door lock switches, operate the driver and passenger door locks.

Do the power door locks operate correctly?

--

Go to Step 4

Go to Power Door Locks System Check in Doors

4

  1. Close both the driver and passenger doors.
  2. Turn ON the ignition.

Is the door ajar message displayed?

--

Go to Diagnostic System Check - Instrument Cluster in Instrument Panel, Guages and Console

Go to Step  5

5

Open the driver door.

Is the door ajar message displayed?

--

Go to Step 6

Go to Diagnostic System Check - Instrument Cluster in Instrument Panel, Guages and Console

6

  1. Close the driver door.
  2. Open the passenger door.

Is the door ajar message displayed?

--

Go to Step 7

Go to Diagnostic System Check - Instrument Cluster in Instrument Panel, Guages and Console

7

Turn ON the ignition.

Is the SECURITY indicator on or flashing?

--

Go to Content Theft Deterrent (CTD) System Check

Go to Step 8

8

Inspect the following circuits for an intermittent malfunction:

    • The driver door jamb switch
    • The passenger door jamb switch.
    • Intermittent communications between the DDM or RFA systems.
    • The power door lock switches.
    • The door lock cylinder switches.

Did you find and correct the condition?

--

Go to Step 10

Go to Content Theft Deterrent (CTD) System Check

9

Repair the no communication malfunction to the system that could not communicate with the scan tool. Refer to Diagnostic System Check - Data Link Communications in Data Link Communications.

Did you complete the repair?

--

Go to Step 10

--

10

  1. Turn OFF the ignition.
  2. Reconnect or install any connectors or components that were disconnected or removed.

Did you complete the repair?

--

Go to Content Theft Deterrent (CTD) System Check

--