Test the radio again, close and open the trunk lid a few times, wiggle the boot wires front, back, sides to make sure everything is nice and smooth and WORKING. Make sure the solder joint works by testing the radio to see if all signals are good both AM/FM. We found a fuel line rubber tube, we slide them in first to use as heavy duty shrink tubing and guard for the kink, it’s a little big but it’s OK. After soldering the ground wires together, we found out that the ground wires are not needed and it actually caused the loss of signals, so we leave them out. Solder the 2 center wires together straight, put them side-by-side, I needed my wife to hold it perfectly straight for me to solder them together. Looking at the breaks, there are 2 places, we need to cut them at these 2 places, strip the outside (ground) and the inside (signal) since this is coax cable. I also use some multipurpose grease inside the boot ends to make sure these wires can slide smoothly. I remove these tapes on both top (trunk lid) and bottom (trunk), clean the wires from old tape adhesive then spray them with silicone lubricant. These tape tidy these cables together cause the friction between the inner rubber boot and the cables which doesn’t allow the cables to slide along the inner boot while being stretched and shrank. Up to this point, to fix the kinks on the antenna cables, we don’t really have to go through all this, the only reason we want to do this is to remove the tapes bundling the cables together that cause the friction between the cables and the rubber boot.īy looking at the way they routed the cables through the trunk to the trunk lid, there are 2 places that the cable were bent and stretch when the trunk is opened/closed. ![]() The white cable is our AM/FM antenna cable The B7 Phase Diversity antenna input on the Sym II+ radio is via two separate antenna leads from the Phase Diversity antenna booster. Now we can pull the cover out slowly and carefully when all the clips are off their seats, watch out for the 2 trunk sensors and not to break them in the process by mistake. The poor FM reception of the B7 radio installed in the B6 is due to a mismatch between the B7 Phase Diversity antenna used with the B7 and the Switching Diversity antenna booster module installed in B6 A4s. Now is the time to remove all the clips surrounding the cover, look at all these clips and figure out how to start, I started from the corner with a pry-bar carefully for the first one, then I used my fingers to snap out one by one slowly and carefully. There are some plastic tabs on the bottom edge which align with holes on the platform behind the rear seats.We need to remove the emergency handle, the emergency triangle holder, pull down handle and the latch plastic cover. Some metal snaps disengaged and I was able to pivot the D pillar cover forward. I was able to pull off the D pillar by grapping it with my fingers at the top and pulling gently. When you remove the D pillar cover, be careful because there is an airbag in the there that you do not want to damage or trigger. They travel down the D pillar into the trunk area. There are two coax outputs, one yellow and one white. 26: Audi A4 Avant Quattro 2009 - Component Locations - Left Rear Of Engine (2.0L) Get Access all wiring diagrams car. There is a blue coax input that comes from the sharkfin roof antenna, a lead with a couple of wires coming from the rear window antenna grid, and another lead also to the rear window grid. 25: Audi A4 Avant Quattro 2009 - Component Locations - Right Front Of Engine (2.0L) Get Access all wiring diagrams car. Under the D pillar on the driver side, you will find an antenna amplifier (aka antenna booster). There are also some on the passenger side top, but on my model (A4 B8 Premium Plus without NAV), the passenger side antenna leads off the rear window are unconnected. Some of the on-glass wires at the driver side top are for the radio antenna. The GPS/NAV and SAT antennas are in the roof-top sharkfin. For those looking to do the install, you will still need a. wiring and connectors, and shipping, I paid about 1200. I replaced the antenna booster and my AM radio reception returned. A4 (B6 Platform) Discussion - Installed the NAV+ (completed install last month, but never wrote about it.) - Price: Cost will vary from person to person, but for the headunit, the GPS antenna, and misc. This indicated to me that something was wrong (probably circuit board cracking) with the antenna booster. I exposed it and pressed around on it while set to AM, and the station came in and out. I did a little research and concluded that the antenna amplifier under the D pillar was probably bad. ![]() If I increased the volume up very loud while set to AM, I could hear the station faintly and with a lot of static. I had a problem with my radio suddenly not receiving AM.
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