There is a service procedure for installing the extenders, Unless you wire it your self. to plug it in like factory you have to have at least 1 type of upgrade.this bulletin referenced turn signal mirrors. I can be more specific with a VIN #.
Some customers/dealers have inquired about the new power folding, electrochromic, outside rear view mirrors ( RPO DL3 ), and if they can switch to the new power extending outside camper style mirrors ( RPO DPF ) ? The answer is yes, however, dealer must also reprogram both the driver door module and the passenger door module to accommodate this change. Also, if the vehicle has redundant steering wheel controls, the DIC ( Driver Information Center-Curb view assist message) must be deleted by reprogramming the truck body control module (TCBM).
Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.
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