Earlier this year, I began experiencing intermittent keyless entry issues and a persistent TPMS warning light, despite recent tire sensor replacements. Initially, I assumed the two problems were unrelated and replaced the keyless remote battery, but this did not resolve the issue.
I mistakenly assumed remote issues were the cause of my problem and replaced them with genuine GM remotes. However, a visit to a GM dealership turned into a frustrating experience. Despite the remotes being sealed in official GM packaging, the technicians questioned their authenticity and incorrectly diagnosed the issue as a faulty Body Control Module, which would have been costly to repair.
I was dissatisfied with the service technician and salesman’s assessment, as their diagnosis was inaccurate. Unfortunately, they were not receptive to my counterargument and charged me for unnecessary services without attempting to troubleshoot the issue systematically.
The technicians had struggled to operate both the new and original remotes, and the service tech detected the radio signal from the remotes but not the vehicle. Additionally, they were unable to reprogram the TPMS. This information led me to realize that the TPMS issue was likely interconnected with the remote control problems.
I informed the GM Dealer that the TPMS and Keyless Entry systems share a common antenna. Despite their insistence otherwise, I was correct. The Keyless Remote Entry and TPMS indeed utilize the same antenna.
The TPMS and Keyless Entry systems on the H3 Hummer share a common antenna. The TPMS warning light was illuminated due to a compromised radio signal. The decreasing range of the Keyless Entry was a related symptom caused by the deteriorating antenna. Applying dielectric grease to the antenna connection, similar to addressing corroded battery terminals, successfully resolved both issues.
After carefully removing the BCM, I cleaned it and repaired the antenna connection to the circuit board. The vehicle is now functioning properly. For a detailed visual guide on this repair, please watch the YouTube video linked below.
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