The LMC5 module is presented as a solution to steering column lock failures affecting 1997-2004 Chevrolet Corvettes (C5 generation). It is a solid-state device designed to simulate a functioning steering column lock system, interfacing directly with the vehicle’s Body Control Module (BCM). Installation is described as a relatively straightforward process requiring minimal disassembly and only two wrenches and a provided tool. The module aims to prevent and resolve issues such as the “Service Column Lock” message and fuel cutoff problems. The documentation highlights its ease of installation and its ability to function even with a low battery.
Understanding the C5 Corvette Steering Column Lock System
The LMC5 module addresses a known issue in C5 Corvettes, where the steering column can become locked, preventing vehicle operation. The module is designed for all 1997-2004 C5 Corvettes. The documentation indicates that over 126,000 Corvettes built between 1997 and 2004 are susceptible to these steering column lock problems. The LMC5 aims to repair and prevent failures that disable the Corvette. It specifically addresses issues that can cause the vehicle to become inoperable.
LMC5 Module Features and Specifications
The LMC5 module is described as a 100% solid-state device, meaning it contains no moving parts. This design is intended to enhance reliability and longevity. The module synchronizes with the Corvette’s BCM each time the vehicle is started. It consumes zero power when the car is off and only a few milliwatts during continuous operation. The module is fully encapsulated to protect it from moisture and physical damage. It is designed and manufactured in the USA. The LMC5 is designed to withstand automotive voltage surges and spikes.
Installation Procedure Overview
The installation of the LMC5 module is designed to be non-invasive, making no permanent modifications to the vehicle. The process does not require significant disassembly of interior panels or parts. No diagnostics, relay testing, dash disassembly, k harness checking, wiring, or circuit tracing are necessary. The module is installed in the passenger side footwell. The installation process is claimed to take minutes using only two wrenches and a provided tool. This simplicity aims to make the module accessible for installation by both vehicle owners and mechanics.
For manual transmission or export C5s, the installation requires locating and detaching a connector from the steering column lock relay above the BCM.
Addressing Existing Steering Column Lock Conditions
The documentation addresses scenarios where the steering wheel is already locked. If the steering wheel turns freely with the key removed from the ignition, only the LMC5 module is required. If the steering wheel locks when the key is out of the ignition, and unlocks normally when the key is turned to the “on” position, the instructions provide a method to keep it unlocked during installation, and only the LMC5 module is needed. Instructions are available to unlock the steering column during the LMC5 installation process.
The Brown Wire Modification
A “brown wire mod” is mentioned in relation to the LMC5 installation, particularly in the context of troubleshooting existing installations. A user forum post details confusion regarding the placement of the brown wire, noting a pre-existing green wire that has been pulled and capped. The instructions suggest inserting the brown wire into the third hole on the left in a connector, diagonally across from the LMC5 green wire location. The process involves snipping a brown loop wire and capping the snipped ends. Another user clarifies that the brown wire should be installed diagonally across from the LMC5 green wire location, and confirms cutting the loop. The documentation provides photos illustrating the correct placement of the orange, purple, and green wires.
Compatibility and Considerations
The LMC5 module is compatible with all 1997-2004 C5 Corvettes. It is also applicable to vehicles that have already undergone recall work related to the steering column lock system. Even if a vehicle’s steering wheel does not currently lock, installing the LMC5 is presented as inexpensive insurance against future problems. The module is also recommended for vehicles that have had other column lock replacement devices installed. The module is also compatible with 1997-2004 Corvettes with manual transmissions (all 6-speed C5 Corvettes).
Troubleshooting and Additional Information
The documentation suggests that even with prior recall work, installing an LMC5 module is beneficial. The module can be kept in the glove box for quick installation by the owner or a mechanic in the event of a future failure. The LMC5 module is presented as a comprehensive solution, repairing all common steering column lock subsystem component and wiring failures connected to the BCM. However, it cannot repair blown fuses or major problems such as a faulty BCM or mechanical failure of the column lock motor. In such cases, the LMC5 is still recommended after the underlying issue is resolved.
The Unlocker Module
A separate “Unlocker” module is available for situations where the steering wheel is locked. This module is used to unlock the steering wheel during the LMC5 installation process. The documentation recommends the Unlocker if there is uncertainty about whether the steering column locks or if difficulty is anticipated in unlocking it. The LMC5 is available both with and without the Unlocker.
CAGS-SKIP Modules
The documentation also briefly mentions CAGS-SKIP modules for 2005-2013 C6 and 1997-2004 C5 Corvettes, related to the CAGS (Computerized Automatic Gear Selection) skip-shift system. These modules are presented as separate products with their own installation procedures and functionalities, but are listed alongside the LMC5 information on the Compliance Parts website.
Conclusion
The LMC5 module is presented as a straightforward and effective solution to address steering column lock issues in 1997-2004 Chevrolet Corvettes. Its solid-state design, simple installation process, and compatibility with various vehicle configurations make it a potentially valuable tool for Corvette owners. The documentation emphasizes its preventative capabilities and its ability to resolve existing problems, offering a relatively inexpensive solution to a potentially disabling vehicle issue. The brown wire modification, while requiring careful attention to detail, is presented as a key step in ensuring proper functionality.