GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Theft Deterrent System Schematics

Connector End View Reference: Theft Deterrent System Connector End Views

DEFINITION: The CTD alarm does not disarm when using a key in any door or rear compartment lock cylinder.

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Disconnect the remote control door lock receiver (RCDLR).
  2. Probe the inoperative lock tamper switch circuit at the RCDLR with a test light to B+.

Does the test light illuminate?

Go to Step 6

Go to Step 3

3

With the test light still connected, unlock the inoperative lock tamper switch with a key.

Does the test light illuminate?

Go to Step 8

Go to Step 4

4

  1. Disconnect the inoperative tamper switch connector.
  2. Test for an open in the tamper switch ground circuit. Refer to Testing for Continuity and Wiring Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 5

5

Test for an open in the door lock tamper switch signal circuit. Refer to Testing for Continuity and Wiring Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 7

6

Test for a short to ground in the inoperative lock tamper switch circuit. Refer to Testing for Short to Ground and Wiring Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 7

7

Test for a poor connection at the inoperative door lock tamper switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 9

8

Test for a poor connection at the RCDLR. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 10

9

Replace the inoperative lock tamper switch.

Did you complete the replacement?

Go to Step 11

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10

Important:  Perform the program procedure for the ISU.

Replace the RCDLR. Refer to Remote Control Door Lock Receiver Replacement .

Did you complete the replacement?

Go to Step 11

--

11

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2