Experiencing problems with your Buick Remote Start Key Fob? You’re not alone. Many Buick owners encounter issues where the remote start function becomes erratic or stops working altogether. In some cases, owners have even noticed that pressing the remote start button on their key fob mistakenly activates the trunk release. This article delves into a common culprit behind these problems: the Remote Control Door Lock Receiver (RCDLR) module. We’ll explore part numbers, potential upgrades, and what you need to know to diagnose and potentially resolve issues with your Buick’s remote start system.
One Buick owner investigating this very issue for their 2007 Lucerne CXS discovered some intriguing information while trying to fix their malfunctioning remote start. They ordered an RCDLR, part number 20803735, and found that OEMCATS.COM indicated this part is used in a staggering 465 General Motors models in the US market from 2006 to 2013. This widespread use explains the part’s affordability and availability.
Alt text: Close-up of a Buick remote start key fob with buttons clearly visible, emphasizing the remote start button.
To confirm the correct part number for their specific vehicle, the owner contacted AC Delco directly at 1-800-ACDELCO. This is a valuable tip for any GM owner: AC Delco can provide part numbers for any component on your GM vehicle free of charge. Simply provide them with your Vehicle Identification Number (VIN).
However, the investigation took an interesting turn when comparing information from AC Delco and ALLDATADIY. While AC Delco confirmed part number 20803735, matching the module in the car, ALLDATADIY listed part number 25852909 as an alternative. Looking up the alternative part, it appeared visually similar to the existing module, suggesting a possible upgraded version. This alternative part number potentially explains suggestions that newer key fobs (those with a star on the back) might be required with it.
Further research uncovered a “Service Update for Inventory and Customer Vehicles-Remote Keyless Entry (RKE) Inoperative and Battery Rundown,” dated 02/15/2007. This service update hints at a potential battery drain issue associated with the RCDLR, along with reported problems of limited operating range for the remote keyless entry system. This discovery raises questions about whether the original RCDLR module was upgraded to address these issues.
Alt text: Image of a Remote Control Door Lock Receiver (RCDLR) module, highlighting its role in the Buick remote start and keyless entry system.
This leads to uncertainty about whether the initially ordered RCDLR module (20803735) is indeed the most suitable replacement, especially considering the possibility of an updated module designed to fix battery drain problems. Despite AC Delco confirming it as the correct part based on the VIN, the existence of a service update and an alternative part number suggests potential revisions during the production run.
Another significant finding emerged while examining the RCDLR reprogramming procedure using a professional-grade Tech 2 dealer scanner. Step #14 of the procedure states:
“When the Calibration Screen displays, select calibration 25808841 for vehicles that are NOT equipped with the remote start feature or calibration 25808842 for vehicles that are equipped with the remote start feature. After selecting a calibration, select Next.”
This step strongly implies that the remote start capability might be inherently present in all vehicles equipped with this RCDLR. The activation of the remote start feature may simply be a matter of software calibration during the vehicle’s initial programming at the factory. It appears dealerships could potentially activate the remote start feature on compatible vehicles by simply reprogramming the RCDLR, offering it as a paid upgrade. This programming difference would also explain why the remote start function wouldn’t appear in the Driver Information Center (DIC) if not initially activated.
The default remote mode of a newly shipped RCDLR remains a point of curiosity. Anecdotal evidence from online forums suggests that replacing the RCDLR is relatively straightforward in terms of physical installation. However, programming the new module often requires a trip to the dealership, incurring additional costs. One user reported purchasing an RCDLR online for around $50 but then faced a $100 dealer programming fee because DIC programming wasn’t sufficient.
If you are experiencing issues with your Buick remote start key fob, investigating the RCDLR module and considering potential programming requirements is a crucial step in diagnosing and resolving the problem. Consulting with an AC Delco representative or a certified mechanic can provide further clarity and guidance for your specific Buick model.
