RAM 1500 Truck 2WD V6-3.9L VIN X (1999)
active code; active codes automatically erase by themselves when the reason for the code has been corrected.
With the exception of the warning lamp trouble codes or malfunctions, when a malfunction is detected, the airbag lamp remains lit for a maximum of 12
seconds or as long as the malfunction is present.
The seat belt lamp replaces the airbag lamp if the airbag lamp is defective. The seat belt lamp pulses ON and OFF 30 times if the airbag warning lamp is
defective.
Stored Codes
Airbag codes are automatically stored in the ACM's memory as soon as the malfunction is detected. The exception is the "Loss of Ignition Run Only"
code which is an active code only.
A "stored" code indicates there was an active code present at some time. However, the code currently may not be present as an active code, although
another active code could be.
When a trouble code occurs, the airbag warning lamp illuminates for 2 seconds minimum (even if the problem existed for less than 2 seconds). The code
is stored, along with the time in minutes it was active, and the number of times the ignition has been cycled since the problem was last detected.
The minimum time shown for any code will be one minute, even if the code was actually present for less than one minute. Thus, the time shown for a
code that was present for two minutes 2 seconds, for example, would be three minutes.
If a malfunction is detected a diagnostic trouble code is stored and will remain stored as long as the malfunction exists. When and if the malfunction
ceases to exist, an ignition cycle count will be initiated for that code. If the ignition cycle count reaches 100 without a reoccurrence of the same
malfunction, the diagnostic trouble code is erased and that ignition cycle counter is reset to zero. If the malfunction reoccurs before the count reaches
100, then the ignition cycle counter will be reset and the diagnostic trouble code will continue to be a stored code.
If a malfunction is not active while performing a diagnostic test procedure, the active code diagnostic test will not locate the source of the problem. In
this case, the stored code can indicate an area to inspect.
If no obvious problems are found, erase stored codes, and with the ignition "ON" wiggle the wire harness and connectors, rotate the steering wheel from
stop to stop. Recheck for codes periodically as you work through the system. This procedure may uncover a malfunction that is difficult to locate.
Interior Lighting
The courtesy lights are controlled by the CTM. The door switches are inputs to the CTM and the courtesy lights are outputs. The glove box lamp and the
ash receiver lamp (if equipped) are not controlled by the CTM, They are hardwired to individual switches and fuses. The ignition key halo lamp is
controlled by the CTM and will remain ON for thirty seconds after the door is closed.
The highline CTM also provides for illuminated entry option. If the CTM detects an unlock signal from the RKE transmitter, a door disarm switch input
or the door jamb switch input, the interior courtesy lights will be turned ON. The illuminated entry function is canceled if the CTM senses and ignition
"ON" condition or the "lock" command from a valid key fob.
If a door is left open or the dome lamp switch is left in the "ON" position for more than fifteen minutes, the CTM will extinguish the lamps to avoid
discharging the battery. If the lamps are turned ON by rotation of the headlamp panel dimmer switch, the CTM will not be able to turn them OFF.
Central Timer Module Description
CENTRAL TIMER MODULE
DESCRIPTION
Two versions of the Central Timer Module (CTM) are available on this vehicle, a base version and a high-line version. The base version of the
CTM is used on base models of the vehicle. It is also sometimes referred to as the Integrated Electronic Module (IEM). The base version of the
CTM combines the functions of a chime/buzzer module, an intermittent wipe module, and an ignition lamp time delay relay in a single unit. The
base version CTM does not communicate on the CCD bus.
The high-line version of the CTM is used on high-line vehicles. The high-line CTM provides all of the functions of the base version CTM, but also
is used to control and integrate many of the additional electronic functions and features included on the high-line models. The high-line version of
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 high-line CTM supports and controls is the Vehicle Theft Security System (VTSS). In the VTSS, the CTM receives
hard-wired inputs from the door jamb, door lock cylinder, and ignition switches. The programming in the CTM allows it to process the
