Central Timer Module: Description

The central timer module (CTM) is located beneath the driver seat. The CTM uses information carried on the programmable communications interface (PCI) data bus network 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 PCI 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 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 Remote Keyless Entry (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 Vehicle Theft Security System (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. Refer to the appropriate wiring information.

Many of the features in the vehicle controlled or supported by the CTM are programmable using the DRBIII(R) scan tool. However, if any of the CTM hardware components are damaged or faulty, the entire CTM unit must be replaced. The hard wired inputs or outputs of all CTM versions can be diagnosed using conventional diagnostic tools and methods; however, for diagnosis of the CTM or the PCI data bus, the use of a DRBIII(R) scan tool is required. Refer to the appropriate diagnostic information.