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Principles of Operation

WARNING: This page is about a different car, the 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, 2004 Ford Excursion, and 2004 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The instrument cluster must be programmed as part of the repair procedure. If this procedure is not followed, the instrument cluster will not operate correctly and may set numerous DTCs, including B2477 or P1639, which indicates that some necessary data has not been programmed into the instrument cluster. Instrument clusters that need programming should not be exchanged between vehicles. In most cases, the parameter values or settings are unique to that vehicle, and if not set correctly, will cause concerns, faults or even render some vehicle's option content to be inoperative. Some programmable parameters such as belt minder on/off or enable/disable can be changed from the factory setting at the customer's request. The diagnostic tool will automatically attempt to retrieve the instrument cluster configuration information from all modules, and from a backup location in the powertrain control module (PCM) when the vehicle ID is carried out. If the instrument cluster and the PCM do not contain correct information, the diagnostic tool will either request "As Built" data or display a list of items that you will need to manually configure, referred to as manufacturer's options. The diagnostic tool will program the instrument cluster based on the data you enter.

There are three different methods that are used for instrument cluster programming:

The instrument cluster is a configurable, hybrid electronic cluster (HEC) that contains a microprocessor, gauges, indicator lamps, backlighting lamps and internal circuitry. The instrument cluster is non-repairable at the dealership level with the exception of the warning indicator bulb, the backlighting bulb and the instrument cluster lens replacement. The instrument cluster utilizes hardwired circuitry, the standard corporate protocol (SCP), and UART based protocol (UBP) communication networks. Communication using the SCP network transmits and receives data between the instrument cluster and the PCM. Communication using the UBP network utilizes data transmitted and received by the instrument cluster and the body security module, driver seat module and the electronic air temperature control (EATC).

It is very important to understand:

The instrument cluster carries out a display prove-out to verify that the warning/indicator lamps and monitored systems are operating correctly. When the ignition switch is turned to the ON position with the engine off, the following indicators will illuminate:

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