RAM 2500 Truck 2WD L6-5.9L DSL Turbo VIN 6 (1998)
Security Lamp/Indicator: Description and Operation
SYSTEM OPERATION
The security lamp gives an indication of the status of the optional Vehicle Theft Security System (VTSS). The lamp is controlled by a hard-wired
input to the instrument cluster from the high-line Central Timer Module (CTM). The lamp is turned on by the instrument cluster circuitry for
about two seconds when the ignition switch is turned to the On position as a bulb test.
After the bulb test, the CTM turns the lamp on or off based upon the arming status of the VTSS. If the security lamp stays on for about thirty
seconds after the ignition switch is turned to the On position, it indicates that Chrysler Collision Detection (CCD) data bus communication with
the Powertrain Control Module (PCM) is inoperative, and that the next attempt to arm the VTSS may not be successful.
Refer to Vehicle Theft/Security Systems for more information on the VTSS and the security lamp.
The security lamp is an amber lamp located within the instrument cluster on the instrument panel. The security lamp receives fused battery feed at
all times and is grounded by the high-line Central Timer Module (CTM) to give a visible indication of the Vehicle Theft Security System (VTSS)
arming status.
The security lamp incandescent bulb and bulb holder can be serviced. Refer to Instrument Panel, Gauges and Warning Indicators/Instrument
Panel/Cluster Bulbs Replacement for the service procedures.
