Heise Axxess GM 06-Up LAN 29 Interface - Retains RAP and NAV Outputs

Our review of the Heise Axxess GM 06-Up LAN 29 Accessory and Nav Output Interface finds it aimed squarely at installers and DIYers who need to restore accessory power and navigation signals when upgrading or replacing factory radios. The single biggest reason to buy is its ability to provide 12-volt 10-amp accessory power while retaining R. A. P., along with dedicated NAV outputs like parking brake, reverse and speed sense, which simplifies integration in non-amplified or replaced amplified systems. It is a practical, installation-focused interface rather than a consumer audio gadget.

Key Features

• Accessory Power: Supplies a stable 12-volt 10-amp accessory feed to power aftermarket head units without relying on the factory switched line.
• Retained Accessory Power: Keeps R. A. P. functionality so accessories remain powered for a programmed time after ignition off, preserving expected vehicle behavior.
• NAV Outputs: Provides parking brake, reverse and speed sense outputs needed to enable navigation and safety interlocks on many aftermarket radios.
• Compatibility with Non-Amplified Systems: Designed for use in vehicles without factory amplifiers or when replacing amplified systems, avoiding complex amplifier integration.
• High-Level Speaker Input: Accepts speaker-level signals from factory radios so audio can be converted and routed when line-level outputs are absent.

Who It's For

This interface is best for professional car audio installers and experienced DIY enthusiasts working on GM vehicles from 2006 and up that use LAN-style factory audio connections. If the job requires retaining accessory power and providing clean navigation control signals while removing or bypassing factory amplifiers, this unit handles those tasks without needing separate modules.

Those who should look elsewhere include buyers who want a consumer plug-and-play adapter without any wiring or those needing a full DSP or amplification solution built into the interface; the Heise Axxess interface is focused on signal routing and power retention rather than tone shaping or boosting output power.

Pros & Cons

Pros

• Provides a reliable 12-volt 10-amp accessory source, eliminating the need to jury-rig power for aftermarket radios.
• Retains R. A. P. so vehicle accessory behavior remains consistent after installation.
• Exposes essential NAV outputs like parking brake, reverse and speed sense for safe navigation integration.
• Handles high-level speaker input, useful when factory line-level outputs are not available.

Cons

• Not a substitute for an amplifier or full DSP if the project requires added power or advanced signal processing.
• Requires installer familiarity with vehicle wiring and LAN-style GM systems; not fully plug-and-play for novices.

Specifications

Product Type	Accessory and NAV output interface
Accessory Power	12-volt, 10-amp
Retained Function	R. A. P. (Retained Accessory Power)
NAV Outputs	Parking brake, reverse, speed sense
System Compatibility	Non-amplified or replaced amplified factory systems
Audio Input	High-level speaker input

Our Verdict

The Heise Axxess GM 06-Up LAN 29 interface is a practical, installer-oriented solution for retaining accessory power and exposing navigation signals when replacing or bypassing factory audio systems. It offers clear value for projects that need reliable 12-volt 10-amp accessory feed and NAV outputs, but those wanting amplification or onboard DSP should pair it with additional components.

Frequently Asked Questions

Does this provide accessory power for aftermarket radios?
Yes, it supplies a 12-volt 10-amp accessory output suitable for most aftermarket head units.

Will it preserve retained accessory power features?
Yes, the interface retains R. A. P. so accessory behavior after ignition off remains functional.

Can it be used if the vehicle has a factory amplifier?
It is intended for non-amplified systems or when replacing amplified systems; additional steps are required to integrate with some factory amplifiers.