RAM 1500 Van V8-5.2L CNG VIN T (1999)
Body Control Module: Description and Operation
Central Timer Module
CENTRAL TIMER MODULE (CTM)
The AB RAM VAN has two different body electrical systems, High Line and Base. The High Line utilizes a Central Timer Module (CTM) to
provide the body features listed below. The CTM was designed to reduce cost, wiring complexity, and improve the system reliable. The CTM
interfaces with other modules in the vehicle on the Chrysler Collision Detection (CCD) data bus network. The CCD data bus network allows the
sharing of information between modules and diagnostic capability using the DRB III. The CTM equipped vehicles can be identified by the sound
of a Key-In Ignition CHIME.
The Base AB RAM VAN body system is composed of individual modules. Because the stand-alone modules do not communicate on the CCD
Bus, they cannot be diagnosed using the DRB. For concerns about the BASE AB VAN, refer to the appropriate service procedures. The Base
version can be identified by the sound of the Key-In Ignition BUZZER.
The CTM provides the following features:
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CCD Bus Communication
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Chime
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Courtesy Lamp Controls/Illuminated Entry
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Enhanced Accident Response
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Intermittent Wiper Delay
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Power Door Locks W/RKE
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Remote Keyless Entry (RKE)
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Speed Sensitive Intermittent Wipers
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Vehicle Theft Security System (VTSS)
The module is located on the left center instrument panel support. It contains a white 18-way and a green 14-way connector.
Central Timer Module Diagnostic Trouble Codes
Door Disarm Switch Failure
Door Lock Switch Failure
Door Unlock Switch Failure
Wiper Park Switch Failure
EEPROM Checksum Failure
Internal ROM Test Failure