For 1990-2009 cars

Step | Action | Values | Yes | No
--- | --- | --- | --- | ---
Schematic Reference: Theft Deterrent System Schematics Connector End View Reference: Theft Deterrent System Connector End Views DEFINITION: The theft deterrent alarm does not sound when the content theft deterrent (CTD) system is in alarm mode, or the theft deterrent alarm sounds when the CTD system is not in alarm mode.
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 | Were you sent here from Content Theft Deterrent (CTD) Alarm Mode Inoperative? | -- | Go to Step 3 | Go to Content Theft Deterrent (CTD) Alarm Mode Inoperative
3 | Does the theft deterrent alarm sound when the CTD system is not in alarm mode? | -- | Go to Step 4 | Go to Step 5
4 | Does the theft deterrent alarm sound when the ignition is ON? | -- | Go to Step 6 | Go to Step 7
5 | Disconnect the theft deterrent alarm harness connector. Does the theft deterrent alarm sound? | -- | Go to Step 8 | Go to Step 9
6 |

1. Turn the ignition ON.
2. Probe the Ignition 1 voltage circuit at the theft deterrent alarm harness connector with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

--

Go to Step 9

Go to Step 13

7 | Measure the voltage of the hazard switch signal circuit at the theft deterrent alarm harness connector with a DMM. Is the voltage near the specified value? | 12V | Go to Step 9 | Go to Step 11
8 | Test the theft deterrent alarm power sounder enable signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 12
9 | Test the theft deterrent alarm ground circuit for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 10
10 | Test the theft deterrent alarm battery positive voltage circuit for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 14
11 | Test the theft deterrent alarm power sounder enable signal circuit for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 15
12 | Repair the short to voltage on the theft deterrent alarm ignition 1 voltage circuit. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | -- | Go to Step 18 | --
13 | Repair the short to ground or the open in the theft deterrent alarm ignition 1 voltage circuit. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | -- | Go to Step 18 | --
14 | Inspect for a loose or poor connection at the harness connector of the theft deterrent alarm. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 16
15 | Inspect for a loose or poor connection at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 17
16 | Replace the theft deterrent alarm. Refer to Horn Replacement . Did you complete the repair? | -- | Go to Step 18 | --
17 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 18 | --
18 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3