ODI has received 33 complaints alleging excessive heat in the ignition switch and related circuitry in 1994-1996 Dodge Ram trucks.The root cause is an excessive current draw through the ignition switch result in fire, smoke, melting of surrounding plastics, stalling and the illumination of air bag and anti-lock brake system (ABS) warnig lights. DaimlerChrsler has been aware of the potential for this failure and implemented a design change to reduce the current draw through the switch.This design change involved the installation of a relay in the blower motor circuitry for all Ram trucks built after March 15,1996.DaimlerChrysler also made available an ignition switch repair package (PN 4874996) which includes the necessary components to upgrade vehicles built prior to the implementation date.DaimleChrysler also issued a correspondence to its zones instructing technicians to replace failed ignition switches in the subject population with the sevice kit only.An Engineering Analysis is necessary to determine if a safety defect trend exists.ODI will focus its investigation on fires in the steering column area as well as the effects of switch failure on the ABS and air bag system.
