RAM 2500 Truck 4WD V10-8.0L VIN W HDC (2000)
information from these inputs and send control outputs to energize or de-energize the headlamp (or security) relay, horn relay, and the security
lamp. The CTM also sends CCD data bus messages to the Powertrain Control Module (PCM) to control the engine no-run feature of the VTSS.
The high-line or premium CTM also contains the receiver and control logic for the power lock and Remote Keyless Entry (RKE) systems, which
are integrated into the arming, disarming, and triggering functions of the VTSS.
Enhanced Accident Response (Highline CTM only)
If the Airbag Control Module (ACM) deploys the airbags, a message is transmitted over the CCD bus to the CTM module to unlock the doors.
The interior lights will be turned ON 10 seconds after getting zero speed message on the CCD bus.
Diagnostics
The CTM is fully addressable with the DRB II and it is the recommended method for diagnosis. The CTM reports 6 Diagnostic Trouble Codes.
All of the inputs to the CTM can be read with the DRB and the outputs can be actuated. If the inputs are OK and the outputs can be cycled with the
DRB, the problem is usually the Central Timer Module.
Central Timer Module
DIAGNOSTIC TROUBLE CODES
Cylinder Lock Switch Failure
Door lock Switch Failure
Door Unlock Switch Failure
Wiper Park Switch Failure
EEPROM Checksum Failure
Internal ROM Test Failure
The high-line or premium CTM also controls and integrates many of the additional electronic functions and features included on models with this
option. The horn relay is one of the hard wired outputs of the CTM. The high-line or premium CTM is programmed to energize or de-energize the
horn relay in response to certain inputs from the Vehicle Theft Security System (VTSS) and/or the Remote Keyless Entry (RKE) system.
Refer to Vehicle Theft Security System in the Description and Operation of Vehicle Theft/Security Systems for more information on the VTSS.
Refer to Remote Keyless Entry System in the Description and Operation for more information on the RKE system.
