The Central Timer Module may be defective. A Central Timer Module (CTM) is used on this model to control and integrate many of the electronic functions and features included in the Vehicle Theft Security System (VTSS). In the VTSS, the CTM receives inputs indicating the status of the door ajar switches, the door cylinder lock switch, and the ignition switch. The programming in the CTM allows it to process the information from all of these inputs and send control outputs to energize or de-energize the horn relay, the headlamp relay, and the VTSS indicator. The control of these inputs and outputs are what constitute all of the features of the VTSS.
The high-line or premium version of the CTM must have the VTSS function electronically enabled in order for the VTSS to perform as designed. The logic in the CTM keeps its VTSS function dormant until it is enabled using a DRBIII® scan tool.
The most reliable, efficient, and accurate means to diagnose the VTSS requires the use of a DRBIII® scan tool. It is therefore recommended that you visit your local dealership for inspection and diagnosis.
