Edward Stefan Posted January 11 Report Share Posted January 11 (edited) Would appreciate some technical insight on an issue (No Audio). I am trying to replace my Original Equipment Radio/Nav/CD part number 8L7T-18K931-DA (Pioneer) with a AL7T-18K931-AC. Replacement unit powers up fine. All features (i.e., media, NAV, Menu) seem to function. Seems to have an output (i.e., bar graph for the sound on screen) but no sound in the vehicle. Put the original unit back in (and after startup completed) media sound in vehicle was as it was before (great sound). What am I doing wrong? Is there a compatibility issue between these units? Edited Sunday at 12:35 PM by 1004ron Quote Link to comment Share on other sites More sharing options...
Haz Posted Sunday at 06:42 PM Report Share Posted Sunday at 06:42 PM Welcome to the Forum @Edward Stefan! While more information would be useful toward assisting you... Year, Model, and Trim Level of your vehicle and, if known, of the replacement Audio Control Module's (ACM) donor vehicle; Is your vehicle equipped with SYNC; What is the feature level of the original and replacement ACMs, per this description example from the 2008 Edge/MKX Workshop Manual... Audio Line-Up The following audio systems are available: Premium — Edge AM/FM single CD or AM/FM 6-CD changer ACM One speaker in each door Audiophile I — Edge AM/FM 6-CD changer or navigation ACM External audio amplifier (with navigation only) Four 2-way speakers in each door, subwoofer in the RH rear quarter Audiophile II — Edge AM/FM 6-CD changer or navigation ACM External audio amplifier (with navigation only) One mid-woofer in each front door, one 2-way speaker in each rear door, 2 A-pillar speakers, subwoofer in the RH rear quarter Premium — MKX AM/FM 6-CD changer or navigation ACM External audio amplifier (with navigation only) One mid-woofer and tweeter in each front door, one speaker in each rear door THX® sound AM/FM 6-CD changer or navigation ACM Audio Digital Signal Processing (DSP) module (with built-in amplifier) located behind the subwoofer One mid-woofer and tweeter in each front door, one 2-way speaker in each rear door, a 3-in-1 instrument panel speaker, 2 D-pillar speakers, subwoofer in the RH rear quarter Because you mention that your vehicle's current ACM sounds great, perhaps you are upgrading to a THX ACM. If so, you will need to add a Digital Signal Processing (DSP) Module for the THX ACM audio output to be usable by your vehicle's speakers, as show in the attached Wiring Diagrams, attached below as PDF documents... If you need electrical connector pinout diagrams and/or diagnostic Pinpoint Test(s), just let me know. Good luck! Premium-Audiophile Edge - Wiring Diagram - 2008 Edge-MKX.pdf Premium Audio-MKX WITHOUT THX - Wiring Diagram - 2008 Edge-MKX.pdf Audio Digital Signal Processing (DSP) Module-THX Audio - Power Distribution Wiring Diagram - 2018 Edge-MKX.pdf THX Audio - ACM to DSP Wiring Diagram - 2008 Edge-MKX.pdf THX Audio - DSP to IP Speakers & Subwoofer Wiring Diagram - 2008 Edge-MKX.pdf THX Audio - DSP to Additional Speakers Wiring Diagram #1 - 2008 Edge-MKX.pdf THX Audio - DSP to Additional Speakers Wiring Diagram #2 - 2008 Edge-MKX.pdf Information and Entertainment System - Description and Operation - 2008 Edge-MKX Workshop Manual.pdf 1 Quote Link to comment Share on other sites More sharing options...
Edward Stefan Posted Sunday at 07:05 PM Author Report Share Posted Sunday at 07:05 PM My vehicle is a 2008 Lincoln Navigator (Elite package). The installed sound system is THX though the Radio-CD-Nav does not report this on startup (only the Lincoln logo). The donor Radio-CD-Nav (AL7T-18K931-AC) is from a 2010 Lincoln Navigator (unknown trim level). On startup the screen does display THX 1 Quote Link to comment Share on other sites More sharing options...
Haz Posted Monday at 06:34 PM Report Share Posted Monday at 06:34 PM (edited) The Ford Expedition Forum is a community of experienced and helpful Expedition & Navigator owners that you may enjoy -- but a long as you're here: Per the Expedition-Navigator Workshop Manual, with emphasis added, the Audio Control Module (ACM) is a configurable component... Principles of Operation Configurable modules accommodate a variety of vehicle options, eliminating the need for many unique modules for one vehicle line. These modules must be configured when replaced as part of a repair procedure. Configurable modules should not be exchanged between vehicles since the settings are unique to each vehicle. Failure to configure a new module may result in improper operation and/or Diagnostic Trouble Codes (DTCs) setting. As-Built Data As-Built data is a VIN specific module configuration record. During vehicle build, the configuration from all modules is downloaded and stored in the As-Built database. NOTE: It is not necessary to obtain As-Built data unless directed to do so by the scan tool. This data may be accessed from the technician service publication website. As-Built datasets for Ford-Lincoln-Mercury vehicles from 1999 to current model years can be obtained from the Ford Service Info website (link), where the user selects and submits Country and Language, and then enters and submits the vehicle's VIN on the next webpage. As-Built data is presented in text format as well as an electronic .ab-format downloadable file. As-Built data for the ACM is contained in Line 727 entries, which are among configuration data for all other of the vehicle's configurable modules. It's worth noting that 2008 Navigators are not equipped with SYNC -- which was introduced on the 2009 Navigator -- so looking at ACM As-Built configuration values for 2008 versus 2010 Model Years reveals a significant difference because of the 2010 ACM's added interaction with the vehicle's SYNC (APIM) Module. Be aware that your 2008 ACM values may not be the same as this VIN-specific 2008 ACM As-Built example... It's likely that your 2010 ACM has set Diagnostic Trouble Codes (DTCs) after its installation in your 2008 Navigator, due to the 2010 ACM looking for -- and not finding -- the expected SYNC (APIM) Module. If the 2010 ACM is returnable, then you may choose send it back because of it's SYNC-capability which your 2008 Navigator lacks. If you cannot return the 2010 ACM, then it may be worth obtaining the As-Built configuration values for your 2008 ACM, either from the module itself using a Scan Tool or Forscan on a device connected to your Navigator's OBDII data port, or, by downloading your Navigator's As-Built dataset from the Ford Service Info site. Then, reprogram the 2010 ACM Line 727 values which correspond to your 2008 Navigator ACM's Line 727 values using a Scan Tool or a device containing a licensed version of Forscan capable of module programing via your Navigator's OBDII data port. Doing this may or may not enable the 2010 ACM to produce joyful noise in your Navigator. Good luck! Edited 12 hours ago by Haz 2 Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted Wednesday at 08:43 PM Report Share Posted Wednesday at 08:43 PM (edited) I don't know the answer to your question, but many replacement modules require programming before use. I'd call a service dept and ask if they know. Believe I'd also try running a speaker all-around test from the radio. If you don't know how to do this, to enter the speaker walk-around test (or audio unit self-diagnostic mode), 1. turn on the radio 2. turn radio to AM/FM. 3. Then to enter the speaker walk-around test, simultaneously press and hold the station preset buttons 3 and 6, for approximately 3 seconds, then release. And you could also try another radio (one that's designed to work in your 08 Lincoln Navigator.) Here's one example: https://www.ebay.com/itm/275826592190?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=ttvpOdc8T8K&sssrc=4429486&ssuid=Snv36mbbRk2&var=&widget_ver=artemis&media=COPY . Edited Wednesday at 08:48 PM by enigma-2 Quote Link to comment Share on other sites More sharing options...
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