{"product_id":"01-04-mb-acc-and-nav-outputs-retains-r-a-p-and-nav-outputs","title":"01-04 MB Acc and NAV OUTPUTS - Retains R.A.P. and NAV Outputs","description":"\u003cp\u003eOur review of the 01-04 MB Acc and NAV OUTPUTS finds it best for installers who need to retain vehicle accessory functions while adding navigation outputs in Mercedes-Benz models. The module's single biggest reason to buy is that it delivers retained accessory power plus dedicated NAV signals without requiring a factory amplifier, making swaps or upgrades cleaner and more reliable. Practical for technicians and experienced DIYers, this review focuses on real-world fit, wiring convenience, and how those NAV outputs behave when integrated with aftermarket head units.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccessory Power:\u003c\/strong\u003e Supplies a 12-volt 10-amp accessory feed so aftermarket radios receive stable power without overloading factory circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetained Accessory Power:\u003c\/strong\u003e Keeps R.A.P. functionality intact so accessories remain powered for the expected post-key-off interval.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-amplified Use:\u003c\/strong\u003e Designed for non-amplified systems or when replacing an amplified factory system to simplify installation and avoid amplifier integration issues.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNAV Outputs:\u003c\/strong\u003e Provides parking brake, reverse and speed sense outputs so navigation and safety interlocks work with the new head unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePre-wired Harness:\u003c\/strong\u003e Ships with a pre-wired AXSWC harness configuration to speed up wiring when the corresponding harness is available.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUpdateable:\u003c\/strong\u003e Micro-B USB updatable for firmware or compatibility fixes without swapping hardware.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe module is aimed at vehicle electronics installers and knowledgeable DIYers working on 2001-2004 Mercedes-Benz models who need to retain accessory power and provide NAV signals when fitting aftermarket head units. It particularly benefits jobs where the original system is non-amplified or where an amplified system is being replaced and amplifier integration is undesirable.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include owners who lack wiring experience or installation resources, and anyone whose vehicle requires a bespoke amplifier retention solution; this unit assumes the installer can match the AXSWC harness and manage CAN or speaker-level connections as needed.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRestores 12V accessory power at 10 amps, preventing accessory underpowering with aftermarket radios.\u003c\/li\u003e\n\u003cli\u003eMaintains \u003cstrong\u003eR.A.P.\u003c\/strong\u003e so convenience features tied to retained accessory power remain functional.\u003c\/li\u003e\n\u003cli\u003eSupplies dedicated \u003cstrong\u003eNAV outputs\u003c\/strong\u003e including parking brake, reverse and speed sense for proper navigation behavior.\u003c\/li\u003e\n\u003cli\u003eMicro-B USB updateable and pre-wired for faster installations when the matching harness is used.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRequires the AXSWC harness (sold separately) which adds cost and another compatibility check to the install.\u003c\/li\u003e\n\u003cli\u003eNot intended as a plug-and-play option for users without wiring experience or access to professional installation tools.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eAccessory and NAV output module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Power\u003c\/td\u003e\n\u003ctd\u003e12-volt, 10-amp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eR.A.P.\u003c\/td\u003e\n\u003ctd\u003eRetained Accessory Power supported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNAV Outputs\u003c\/td\u003e\n\u003ctd\u003eParking brake, reverse, speed sense\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eUsed for 01-04 Mercedes-Benz models (non-amplified or replacing amplified)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHarness\u003c\/td\u003e\n\u003ctd\u003ePre-wired AXSWC harness included; AXSWC sold separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFirmware\u003c\/td\u003e\n\u003ctd\u003eMicro-B USB updatable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe 01-04 MB Acc and NAV OUTPUTS is a practical, installer-focused solution for retaining accessory power and adding navigation outputs in older Mercedes-Benz vehicles. It offers sensible features like a 10A accessory feed, R.A.P. retention and updateable firmware, making it good value for professionals and competent DIYers who can source the AXSWC harness and handle wiring.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this unit retain the vehicle's RAP functions?\u003c\/strong\u003e\u003cbr\u003eYes, it retains Retained Accessory Power so accessories remain powered after key-off for the vehicle's standard interval.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre NAV outputs included for parking brake and backup detection?\u003c\/strong\u003e\u003cbr\u003eYes, it provides parking brake, reverse and speed sense outputs required by many navigation units.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the AXSWC harness included?\u003c\/strong\u003e\u003cbr\u003eThe module is pre-wired for the AXSWC harness, but the AXSWC harness itself is sold separately and must be obtained for a fully plug-in installation.\u003c\/p\u003e","brand":"Metra","offers":[{"title":"Default Title","offer_id":48674825240795,"sku":"B089VQD6KL","price":68.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51-HoKlQ0LL._AC_SL1200.jpg?v=1778711682","url":"https:\/\/gearmusthave.com\/products\/01-04-mb-acc-and-nav-outputs-retains-r-a-p-and-nav-outputs","provider":"GearMustHave","version":"1.0","type":"link"}