Central Timer Module: Description

The Central Timer Module (CTM) is located beneath the driver seat. The CTM uses information carried on the Controller Area Network (CAN) data bus along with many hard wired inputs to monitor many sensor and switch inputs. In response to those inputs, the circuitry and programming of the CTM allow it to supply the vehicle occupants with audible and visual information, and to control and integrate many functions and features of the vehicle through both hard wired outputs and the transmission of message outputs to other modules in the vehicle over the CAN data bus.

The features that the CTM supports or controls include the following:

• Central Locking  - The CTM on vehicles equipped with the optional Vehicle Theft Security System (VTSS) includes a central locking/unlocking feature.
• Enhanced Accident Response  - The CTM provides an optional enhanced accident response feature. This is a programmable feature.
• Panic Mode  - The CTM provides support for the optional Remote Keyless Entry (RKE) system panic mode including horn, headlamp, and park lamp flash features.
• Power Lock Control  - The CTM provides the optional power lock system features, including support for the automatic door lock and door lock inhibit modes.
• Programmable Features  - The CTM provides support for certain programmable features.
• Remote Keyless Entry  - The CTM provides the optional RKE system features, including support for the RKE lock (with optional horn and park lamps flash), unlock (with park lamps flash, driver-door-only unlock, and unlock-all-doors), Panic, and illuminated entry modes, as well as the ability to be programmed to recognize up to four RKE transmitters. The RKE horn, driver-door-only unlock, and unlock-all-doors features are programmable.
• Vehicle Theft Security System  - The CTM provides control of the optional VTSS features, including support for the central locking/unlocking mode and control of the security indicator in the instrument cluster.

Hard wired circuitry connects the CTM to the electrical system of the vehicle. These hard wired circuits are integral to the vehicle wire harness, which is routed throughout the vehicle and retained by many different methods. These circuits may be connected to each other, to the vehicle electrical system and to the CTM through the use of a combination of soldered splices, splice block connectors, and many different types of wire harness terminal connectors and insulators. Refer to SYSTEM WIRING DIAGRAMS . The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

Many of the features in the vehicle controlled or supported by the CTM are programmable using a diagnostic scan tool. However, if any of the CTM hardware components are damaged or faulty, the entire CTM unit must be replaced.