GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 LeSabre 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Content Theft Deterrent (CTD) Alarm Mode Inoperative

Step

Action

Value(s)

Yes

No

1

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

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Go to Step 2

Go to Content Theft Deterrent (CTD) System Check

2
  1. Turn the IP dimmer switch off.
  2. Turn on the interior lights override switch enabling the interior lights.
  3. Turn the ignition switch to the RUN position.
  4. Lower the driver's window in order to prevent lockout.
  5. Close all the vehicle doors.
  6. While observing the interior courtesy lights, open then close the driver's door.

Did the interior courtesy lights turn on with the driver's door open and turn off with the driver's door closed?

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Go to Step 3

Go to Interior Lamps System Check in Lighting Systems.

3
  1. Turn the IP dimmer switch off.
  2. Close all the vehicle doors.
  3. Turn on the interior lights override switch in order to enable the interior lights.
  4. Turn the ignition switch from the RUN position to the LOCK position.
  5. While observing the interior courtesy lights, remove the key from the ignition key cylinder.

Did the interior courtesy lights turn on upon removing the key from the ignition lock cylinder?

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Go to Step 4

Go to Interior Lamps System Check in Lighting Systems.

4
  1. Remove the key from the ignition lock cylinder.
  2. Close all the vehicle doors.
  3. While observing the door locks, press lock then unlock on the driver door lock switch.
  4. While observing the door locks, press lock then unlock on the passenger door lock switch.

Do all the doors lock and unlock when using either door lock switch?

--

Go to Step 5

Go to Step 9

5
  1. Remove the key from the ignition lock cylinder.
  2. Close all the vehicle doors.
  3. While observing the door locks, press lock, then unlock on the keyless entry transmitter.

Do the door locks operate when using the keyless entry transmitter?

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Go to Step 6

Go to Step 10

6

Perform the Content Theft Deterrent System Check. Refer to Content Theft Deterrent (CTD) System Check .

Does the content theft deterrent system work as described in the Content Theft Deterrent System Check?

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Go to Step 7

Go to Step 8

7

A malfunction is not present at this time. Refer to Content Theft Deterrent (CTD) Circuit Description .

Is the action complete?

--

Go to Content Theft Deterrent (CTD) System Check

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8
    • Inspect the body control module (MALL) connectors for poor terminal contact. Make repairs as needed. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.
    • If the connections are OK, then replace the MALL. Refer to Body Control Module Replacement in Body Control System.

Is the repair complete?

--

Go to Content Theft Deterrent (CTD) System Check

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9

Repair Poor Terminal Contact at the Theft Deterrent Module

Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Content Theft Deterrent (CTD) System Check

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10

Replace the Theft Deterrent Module

Refer to Theft Deterrent Module Replacement

Is the repair complete?

--

Go to Content Theft Deterrent (CTD) System Check

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