How to Disable DLRs

It may help you to know that if you plan on ordering a new General Motors car or truck, but don't want DRLs, you don't have to have them. Simply insist that the car be ordered with RPO T62. RPO means "Regular Production Option" T62 "Lamp System Daytime Running - Delete." (Unofficial list of 2002MY GM truck RPOs) Remember, DRLs are not mandatory in the United States. You don't have to have them if you don't want them. If buying from stock, INSIST that the dealer disable the DRLs as a condition of sale. Contrary to what the dealer might say, there is no law in the US preventing them from doing so.

Many GM have a "DRL fuse", associated with a DRL Module & and up to 3 relays. Usually HI beams in series. Some the LO beams are reduced by 2 volts with a double diode assembly. Some, the fuse also controls the Fog lights and "automatic lights on" at dusk feature. Other cars the fuse will not deactivate the fogs and auto "ON". 1999 and 2000 more likely to have the "auto on" feature, related to the GM liability for no tail lights at night. On some newer GM models it may be possible to press the "Dome Override" button 3 or 4 times within 6 seconds. This will disable the DRLs while the vehicle is running. When it is restarted, the DRL function will reset to "always on." We've heard that this works on full-size and S-series trucks.

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