RAM 2500 Van V8-5.2L Prop VIN 2 (2000)
Audible Warning Device Control Module: Description and Operation
A Central Timer Module (CTM) is used on this vehicle when it is equipped with the optional Vehicle Theft Security System (VTSS). In addition to
serving as the security system module, the CTM combines the functions of a chime/buzzer module, an intermittent wipe module, an illuminated entry
module, and a Remote Keyless Entry (RKE) module in a single unit.
The CTM is also able to control and integrate many of the additional electronic functions and features included on models with this option. The CTM
contains a central processing unit and 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 sensor information. This helps to reduce wire harness complexity, reduce internal controller hardware,
and reduce component sensor current loads. At the same time, this system provides increased reliability, enhanced diagnostics, and allows the addition of
many new feature capabilities.
One of the features that the CTM supports and controls is the Vehicle Theft Security System (VTSS). In the VTSS, the CTM receives hard-wired inputs
from the door ajar, front door lock cylinder, and ignition switches. The programming in the CTM allows it to process the 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 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.
The CTM is mounted under the instrument panel, to the inboard side of the left center instrument panel support.
The programmable features of the CTM can be enabled or disabled using the DRB III scan tool as described in the proper Diagnostic Procedures. For
diagnosis of the CTM or the CCD data bus, a DRB III scan tool and the proper Diagnostic Procedures are recommended. The CTM cannot be repaired
and, if faulty or damaged, it must be replaced.
The CTM is mounted under the instrument panel, to the inboard side of the left center instrument panel support. For diagnosis of the CTM or the CCD
data bus, the use of a DRB III scan tool and the proper Diagnostic Procedures are recommended. The CTM cannot be repaired and, if faulty or damaged,
it must be replaced.
Some of the functions and features that the CTM supports or controls include:
-
Chimes for the following conditions:
-
Headlamps on with ignition off and driver door open warning
-
Key in ignition with ignition off and driver door open warning
-
Airbag lamp warning
-
Check gauges lamp warning
-
Low fuel lamp warning
-
Low washer fluid lamp warning
-
Seat belt reminder lamp warning
-
Transmission oil temperature lamp warning
-
Central locking
-
Courtesy lamp time-out
-
Intermittent wipe control
-
Enhanced accident response
-
Horn chirp upon door lock with RKE (programmable)
-
Illuminated entry
-
Power lock delay
-
Power lock inhibit
-
Remote Keyless Entry (RKE)
-
Rolling door locks (programmable)
-
Speed sensitive intermittent wipe
-
Vehicle Theft Security System (VTSS)
-
Wipe after wash.
More information on the operation of these CTM features and functions can be found that covers the system to which that feature or function applies.
The RKE receiver within the CTM has a memory function to retain the vehicle access codes of at least one, but no more than four RKE transmitters. The
receiver is designed to retain the transmitter codes in memory, even if the battery is disconnected.
Some of the features and functions of the power lock, illuminated entry and RKE systems made possible because of the communication of the CTM on
the CCD data bus network include:
-
A door lock inhibit feature which prevents the power lock system from being energized with a power door lock switch if the key is in the ignition
and/or the headlamps are ON. However, the locks can still be operated manually, with a key, or energized with the RKE transmitter.
-
A delay lock feature. With the delay lock feature, if a side or rear door is still open when a lock request is received by the CTM, the module will
automatically cycle all of the power lock motors to lock five seconds after the doors are closed.
