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: Incompatibility between the ICU and other chassis modules, leading to phantom fault codes.
Without the issuing company name, – but in 90% of cases, it’s an aircraft or industrial component service bulletin . Start by identifying the equipment (make/model/serial) and then search within that OEM’s library. bulletin 54-088
Daimler Truck North America Service Bulletin 54-088 addresses non-functioning heated headlamps on Freightliner 47X and Western Star 49X models by updating parameter settings for expansion modules XMC1 and XMC2. The bulletin, which applies to vehicles with specific wiring configurations, requires using DiagnosticLink to verify and adjust settings to ensure proper heating element activation in cold conditions. Review the Official Service Bulletin PDF for specific parameter values. Non-Functioning Heated Headlamps - nhtsa : Incompatibility between the ICU and other chassis
: Inaccurate readings for air pressure, fuel levels, or vehicle speed. or vehicle speed.
