RAM 3500 Truck 4WD V8-5.9L VIN Z LDC (2000)
The Ram truck equipped with a high line CTM will utilize speed sensitive intermittent wipers. Only a high line CTM will be able to support this
feature. A base CTM (IEM) will provide for intermittent wipers without the speed sensitive feature. The low and high speeds are controlled
through the wiper stalk switch. The intermittent portion of the wiper control is handled by the CTM through the intermittent wiper relay. When the
module detects a decrease in delay time as selected by the driver, an immediate wipe of the windshield takes place and the new delay interval is
implemented. This feature is present on both the base and highline CTM.
When the vehicle is moving at speeds at or below 10 mph, the delay time ranges from 1 to 36 seconds. When the speed rises above 10 mph, the
delay times are cut in half for a range of 1/2 to 18 seconds. The speed signal is provided to the CTM from the PCM over 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
COMPASS MINI-TRIP COMPUTER (CMTC)
This system, located in the overhead console, displays information on outside temperature, compass direction and trip information.
Compass/Temperature Display
This display provides one of eight compass readings to indicate the direction the vehicle is facing and the outside temperature. Pressing the US/M
button for more than 10 seconds will toggle to the Compass/Compass in Degree Display. This display provides one of eight compass readings to
indicate the direction that the vehicle is facing and provides the compass direction in degrees (0 to 359 °) North is 0 °, East is 90 °, South is 180 °
and West is 270 °.
Trip Odometer (ODO)
Shows the distance traveled in miles or km since the last reset.
Average Fuel Economy (AVE ECO)
Shows the average fuel economy in MPG (miles per gallon) or L/1OOKm since the last reset.
Instantaneous Fuel Economy
Shows the instantaneous fuel economy in MPG (miles per gallon) or L/100 Km.
Distance to Empty (DTE)
Shows the estimated distance that can be traveled with the fuel remaining in the tank. This level calculated using the MPG multiplied by the Fuel
Tank Level.
Elapsed Time (ET)
Shows the accumulated ignition on time whenever the CMTC is powered up until a reset takes place.
Step Button
Press this button to cycle through all the mini-trip computer displays.
US/M Button
Press this button to convert all vehicle displays from US to Metric and vice versa.
To Reset the Display
Press the Step and US/M buttons simultaneously for at least two seconds and all resettable conditions will be reset. This will occur only if a
resettable function (AVG ECO, ECO, ET) is currently being displayed.
Compass Calibration
This is a Fast Auto-Cal compass that manually enters the calibration mode when the US/M and Step buttons are pressed for more than 6 seconds
in the Compass/Temperature screen. The 'CAL' will illuminate to indicate the compass is in calibration mode. Drive the vehicle around in all four
compass directions, such as driving around a street block several times or driving in 2-3 circles with a slow to medium speed. When the calibration
process is completed, the 'CAL' will go OFF and the compass will function normally. The calibration should take place in an area that is leveled
and minimum of 50 feet away from metal objects, power lines, buildings and large steel structures.
If the 'CAL' message remains in the display, either there is excessive magnetism near the compass, or the unit is faulty. If the wrong direction is
