Frequently Asked Questions
Everything you need to know about this head unit
Connect the single RCA cable with the yellow plug (included in your package) to extend your Bluetooth signal. This cable doubles as both a camera input AND a Bluetooth/WiFi antenna extension. The two small blue wires attached are antenna boosters that significantly improve connection stability. This simple connection takes 30 seconds and resolves 90% of Bluetooth issues. Make sure it's firmly connected even if you're not using a rear camera.
Try these proven solutions:
1. Quick Fix: Settings → Apps → Z-Link → Disable → Enable → Open (repeat each use)
2. Check Cables: Use the data/charge USB cable (not charge-only)
3. Bluetooth Setting: Disconnect all other Bluetooth connections - CarPlay needs exclusive access
4. Factory Reset Z-Link: Find the pink 'RESET' app, restart, reconnect Bluetooth, then try Z-Link
5. Sound Issues: Switch audio source to 'AUX' or 'USB/AUX' in your vehicle menu
Most issues are resolved with step 1 or 3!
The processor differs between models: The 2/32GB has a 4-Core processor, while 4/64GB and 8/128GB models feature the powerful 8-Core Cortex-A55 processor. Combined with RAM differences: The 2/32GB model with its 4-Core processor and limited RAM may experience slowdowns with heavy multitasking. The 4/64GB with 8-Core provides smooth performance for most users - no lag, seamless app switching, and enough storage for maps and music. The 8/128GB with 8-Core offers maximum performance with its generous RAM allowing unlimited multitasking and massive storage for extensive media libraries. Think of RAM like your desk space - more RAM means you can have more apps open simultaneously without slowing down.
Absolutely normal! These head units are complete replacement systems with their own GPS antenna, microphone, and Bluetooth module. Your factory connectors for these features won't be needed anymore. The important connections are: main power harness, speaker outputs, and the yellow RCA cable (even if not using a camera - it extends Bluetooth range). Any leftover factory plugs can be safely tucked away. If you're unsure about any connection, our support team is here 7 days a week.
Z-Link updates are handled through system firmware updates. Go to Settings → System → System Update. If an update is available, download it to a USB drive (FAT32 format) and install. Important: Never download Z-Link APKs from unofficial sources - they won't work and may cause issues. If you're having compatibility issues with newer iOS versions, the disable/enable workaround (Settings → Apps → Z-Link) usually resolves them while waiting for official updates.
Consider your usage:
• 2/32GB (4-Core): Budget option - fine for basic use, but may lag with multiple apps due to 4-Core processor and limited RAM
• 4/64GB (8-Core): Sweet spot - smooth Android Auto/CarPlay, multitasking, and ample storage
• 8/128GB (8-Core): Premium choice - unlimited multitasking, massive storage, future-proof for years
Most customers choose 4/64GB for the perfect balance of performance and value. The extra RAM makes a huge difference in daily smoothness!
The yellow RCA cable's blue antenna wires also boost WiFi signal! Make sure this cable is connected. Additionally, try these tips: Position the blue antenna wires away from metal surfaces, check that your phone's hotspot is set to 2.4GHz (not 5GHz) for better range, and ensure the head unit's WiFi sleep policy is set to 'Never' in Settings → WiFi → Advanced. For best performance with wireless CarPlay, keep your phone within 1-2 meters of the head unit.
Go to Settings → Sound → Equalizer and adjust to your preference. For more volume, increase the 'Loudness' setting. The 4/64GB and 8/128GB models have superior audio chips that provide cleaner, louder sound. If you have an amplifier, use the RCA outputs for best quality. Also check Settings → Factory Settings (password usually 126) → Audio settings for additional gain controls. Remember: higher-spec models (4GB+) include premium audio components for noticeably better sound.
Yes! Most vehicles work instantly. If not, use the steering wheel learning app: tap the steering wheel icon, press each button on your wheel, and assign functions. For newer vehicles with CANbus, we provide CANbus modules for automatic setup. Some vehicles may need the Key1/Key2 wires connected (usually included in our harness). If you're having trouble, let us know your exact vehicle model and we'll provide specific instructions.
We offer a 30-day return policy. If it doesn't fit or there's a compatibility issue, we'll work with you to resolve it. If you change your mind, a 20% restocking fee applies. Our team verifies compatibility before shipping to minimize issues. We provide installation support 7 days a week to help resolve any problems. With our 3-year warranty and Australian-based support, you can purchase with confidence. Full details in our Refund Policy.
Historical Context of GMC Sierra:
Origins – Early Sierra Line Appearances (1960s-1980s):
The roots of the GMC Sierra name initially trace back to a trim-level distinction applied to GMC trucks in the late 20th century. Prior to becoming its distinct model series, "Sierra" often represented superior packages on the GMC C/K lineup, primarily emphasizing upscale interior treatments, enhanced comfort, and appearance details compared to standard versions.
First Generation Sierra – Independent Model Identity (1988-1998):
GMC officially transformed the Sierra into its standalone model range in 1988, coinciding with the introduction of the GMT400 platform. Immediately popular, the first-generation Sierra showcased modern body styling, improved ergonomics, and spacious interiors. Coupled with robust V6 and V8 powertrain options, these Sierras became preferred choices in work and personal-use contexts widely throughout North America, appreciated for durable construction and driving ease.
Second Generation – Refinement and Popularity (1999-2006):
Built on GM's GMT800 platform, the second-generation Sierra refined its reputation by expanding engine options, improving safety features, incorporating digital instrumentation, and offering enhanced ride comfort. This series firmly cemented the truck's dual capability as both a practical, reliable workhorse and a smooth commuter vehicle, boosting its popularity substantially.
Third Generation – GMT900 Platform (2007-2013):
Introduced on the GMT900 architecture, the third-generation GMC Sierra evolved further, presenting significant design advancements, mechanical refinements, and increased towing capacities. Well-loved features included standout interior improvements, quieter cabins, more powerful yet efficient engine offerings, and notably refined ride quality—collectively enhancing its appeal for commercial and private buyers alike.
Fourth Generation – GMT K2XX Platform (2014-2019):
The 2014 Sierra iteration marked an impressive move forward within the GMT K2XX platform, providing substantial advancements aimed notably at improving ride quality, cabin refinement, and visual presence. The revised styling introduced aggressively defined squared-off profiles, structured lines, advanced LED accent lighting, and elevation in overall build sophistication. Engine capabilities consistently delivered commanding performance through popular EcoTec3 configurations: incorporating direct fuel injection, variable valve timing, and active fuel management, ensuring both impressive towing power and improved fuel efficiency.
Beyond purely functional measures, the GMC Sierra models from this generation delivered increased cabin serenity, architectural solidity, and substantial interiors, improved material choice, and better ergonomic form. Infotainment systems evolved significantly, introducing intuitive interfaces, improved sound quality, and convenient accessibility, laying strong foundations for contemporary connectivity expectations.
Product Integration and Advanced Infotainment Capabilities:
For drivers of GMC Sierra's 2014-2019 series, Brummstadt offers a premium strategically developed head unit upgrade that effortlessly aligns with the factory dashboard layout and vehicle aesthetics. Compatible specifically with the unique interior architecture of this Sierra generation, the carefully developed infotainment system assures complete integration in both form and functionality.
Primary Highlights of Brummstadt's Premium Infotainment Upgrade:
- Wired and wireless support for Apple CarPlay and Android Auto ensures connectivity with minimal effort. Imagine savoring a relaxed dinner with family, shortly thereafter setting the next destination through Apple or Google Maps directly from a smartphone. Once back on the road, previously mapped destinations automatically appear on this advanced head unit, facilitating a smooth, stress-free transition from casual dining to the comfort of a friend's house without complicated navigation configurations.
- Beyond standard infotainment capabilities, upgrades include optional front and rear 1080p HD cameras with continuous recording functionality, extending practical visibility and providing video documentation—beneficial for keeping track of driving surroundings and safeguarding against unexpected incidents.
- Emphasizing entertainment versatility, the infotainment system can host multiplayer sessions by allowing gaming joysticks to connect seamlessly via USB ports. Such capabilities transform longer rides into rewarding opportunities for shared journeys, effortlessly entertaining family or friends.
- Genuinely thoughtful convenience comes from integrated advanced voice control technology. In addition to effortless phone calls, navigation requests, or music playback commands, the head unit's integration of familiar voice assistants allows interaction beyond the driving cabin. For instance, comfortably approaching home, verbal requests such as "Hey Siri, turn on porch lights", can automatically activate smart household lights, improving safety, visibility, and comfort in everyday scenarios.
Advantages and Benefits in the 2014-2019 GMC Sierra Series:
The Sierra GMT K2XX iteration stands out as physically robust, visually appealing, and efficiently capable, accommodating the rigorous demands of practical commercial utilization and comfortable personal transport equally well. Renowned for powerful engines providing strong towing capacities and responsive driving dynamics, the Sierra maintains a balance between rugged reliability and everyday usability.
The inclusion of noise suppression technologies, improved suspension tuning, and lush yet durable interior materials significantly heightens comfort and reduces driver fatigue on extended journeys. Exterior styling has focused a sense of professionalism and modern confidence, creating a solid road presence that commands respect while emphasizing refined sophistication and thoughtful layout internally.
Implementing advanced infotainment improvements—especially those thoughtfully designed by aftermarket specialists like Brummstadt—builds meaningfully upon existing strengths by substantially adding practicality, entertainment, modern connectivity solutions, and comfort. The benefits clearly translate into daily driving routines, long-distance travels, mixed-use hauling scenarios, and leisure road trips alike, distinctly uplifting drivers' relationships with their vehicle.
Ultimately, the fourth-generation GMC Sierra represents a thoughtfully developed step forward within the range's lineage, preserving the capable core essence established over preceding generations while subtly yet purposefully incorporating innovations essential to contemporary lifestyles. Coupled with sophisticated infotainment solutions carefully matched to complement and expand vehicle functionality, the GMC Sierra from these influential model years embodies a noteworthy blend of traditional truck reliability with highly modernized driving environments—delivering satisfaction that harmoniously aligns heritage, practicality, technology, and refined daily usability.