The installation of an electronic bypass module is a critical step in the conversion process for General Motors (GM) vehicles equipped with the Z55 electronic suspension system. This article provides a detailed overview of the installation process, focusing on the steps outlined in the Arnott conversion kits for both short and long wheelbase models. The information is drawn from technical instructions and user experiences, offering a practical guide for qualified technicians or experienced DIY enthusiasts.
Overview of the Conversion Process
The Z55 electronic suspension system is a complex setup that includes electronically controlled shocks, air springs, and a suspension control module. For some vehicle owners, converting this system to a standard mechanical suspension setup is a preferred route, often for cost, simplicity, or reliability reasons. The Arnott conversion kits offer a solution by allowing users to replace the air suspension components with traditional coil springs and shocks. A key part of this conversion is the installation of the electronic bypass module, which effectively disables the original suspension control system.
The installation process involves removing the original components and installing a new coil spring system, as well as relocating or bypassing the suspension control module. The process varies slightly between short and long wheelbase models, with different locations for the suspension control module and different installation steps.
Step-by-Step Installation Procedure
Pre-Installation Preparation
Before beginning the installation, it is essential to prepare the vehicle and the workspace properly. The first step in the procedure is to disconnect the vehicle's battery to prevent electrical shorts during the installation process. This is followed by locating and removing the air compressor fuse, which is typically found in the engine compartment. The exact location of the fuse may vary depending on the vehicle model, so consulting the owner’s manual is recommended.
Once the electrical components are addressed, the vehicle must be safely jacked up according to GM's instructions. This step is crucial for ensuring both the safety of the technician and the structural integrity of the vehicle during the installation. After the vehicle is supported, the wheel can be removed, allowing access to the suspension components.
Removal of Original Components
The next phase involves removing the original air suspension components. This includes disconnecting the shock sensor connector at the top of the shock absorber and removing the air line by rotating the clip 90 degrees. If the shock absorber is difficult to remove due to pressure on the upper mounts, a floor jack can be used to relieve that pressure.
Following the removal of the shock absorber, the sway bar, height sensor, and rear springs must be removed as well. This step also requires careful handling of the brake sensor and ride height sensor, which should be disconnected with care to avoid damage. Additionally, the brake line must be unbolted from the rear differential.
Installation of New Components
Once the original components have been removed, the new coil spring can be installed. It is important to ensure that the coil spring is oriented correctly to match the specifications provided in the Arnott conversion kit. After the coil spring is in place, the sway bar and shock absorber are reconnected.
The final step in this part of the process is tightening the shock bolts and reconnecting the brake line, ride height sensor, and brake sensor. This ensures that all mechanical components are securely in place and functioning as intended.
Installing the Electronic Bypass Module
The installation of the electronic bypass module is a critical step in the conversion process. The location of the suspension control module varies depending on whether the vehicle is a short or long wheelbase model. For short wheelbase models (such as the Tahoe, Yukon, and standard Escalade), the suspension control module is located in the passenger-side rear cargo area. For long wheelbase models (such as the Suburban, Avalanche, Yukon XL, and Escalade ESV/EXT), the suspension control module is located above the spare tire.
In both cases, access to the module may require removing a clip that holds the wire harness in place. Once the module is accessible, the bypass module can be installed according to the instructions included in the Arnott conversion kit. This step effectively disables the original electronic suspension system, allowing the vehicle to function with the new mechanical components.
Compatibility and Kit Selection
The Arnott conversion kits are designed for specific vehicle models, with two primary kits available. The C-3184 Conversion Kit is intended for short wheelbase vehicles, including the Tahoe, Avalanche, Yukon, and standard Escalade. The C-3185 Conversion Kit is designed for long wheelbase vehicles, such as the Suburban and Yukon XL. These distinctions are important for ensuring that the correct components are used during the installation process.
Users who are unsure whether their vehicle is equipped with the Z55 system can use the GM suspension decoder tool provided by Arnott. This tool allows users to input their vehicle’s RPO (Regular Production Option) codes to confirm the presence of the Z55 system.
Safety Considerations
Throughout the installation process, safety is a paramount concern. The instructions emphasize that coil spring installation can be dangerous and should only be performed by a qualified and experienced mechanic. This is due to the high energy stored in the springs and the potential for injury if the installation is not performed correctly.
Technicians are advised to follow all manufacturer guidelines and to use appropriate safety equipment, including gloves, eye protection, and proper lifting tools. Additionally, the vehicle should be securely supported during the installation to prevent any unexpected movement.
User Experiences and Challenges
While the provided instructions are based on technical documentation, some user experiences highlight the challenges that may arise during the installation. One user reported difficulty in locating the air suspension controller for a 2002 Yukon Denali XL, despite the instructions indicating that it is located in the rear right side of the cargo area. This discrepancy suggests that the location of the controller may vary slightly between models or production years, and users are encouraged to consult the vehicle's wiring diagram or seek professional assistance if necessary.
Conclusion
The installation of the Arnott electronic bypass module is a key component of the conversion process for GM vehicles equipped with the Z55 electronic suspension system. This article has outlined the step-by-step procedure, including the removal of original components, installation of new coil springs, and proper placement of the bypass module. The process requires careful attention to detail and a strong understanding of suspension systems to ensure a successful conversion.
For qualified technicians or experienced DIY enthusiasts, this conversion can provide a reliable and cost-effective alternative to the original electronic suspension system. However, due to the complexity and potential risks involved, it is strongly recommended that the installation be performed by a qualified mechanic.