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Popping from rear speakers, intermittent

hammarlund

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When I turn on or start the car, sometimes there is a loud popping, once per second, for up to two minutes. Once it stops the radio will play through all speakers. If I disonnect the left most connector on the amp ( I believe that harness comes from the radio unit ), no popping. Did the software update at the dealer but it didn't help. Anyone else have this, what was the fix?
 

hammarlund

New member
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1
I brought the car to a Lincoln dealer to perform a software update, but that didn't fix the problem. They spent another 4 hours "troubleshooting" but were unable to diagnose and fix. Are Lincoln dealers able/qualified to diagnose problems with the THX sound system?
 

hammarlund

New member
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replaced the radio unit, the problem still persists. seems like only the amplifier remains a possibility (doubt a wiring issue). reluctant to bring it back to another dealer. any ideas?
 

hammarlund

New member
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have an appointment in a few days at another dealer. they'll run diagnostics ( $80 ) and have an answer in a couple of hours ( they say and I hope ). They suspect the amp. Will update when I have the results.
 

hammarlund

New member
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they diagnosed a bad amp. that's ordered, should be here tomorrow. I took the amp in the car out and removed the main board to inspect for things that might cause an intermittent problem: bad solder connection on the connector headers, electrolytic caps etc. Didn't see anything. For the price of the amp, this had better be the problem!
 

hammarlund

New member
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1
new amp installed, no popping. but amp doesn't work yet because it has to be "programmed" to work with the rest of the system in the car. The original part number ended in "-AA", but the replacement ends in "-B". So I get to spend another $120 for the dealer to update the system with this information. Wonderful. Let's see: $80 + $640 + $120. Wonderful.
 

hammarlund

New member
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Update will be done next week, so if it doesn't work I'll post that info. Otherwise, $840 bucks total to fix!!
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hammarlund

New member
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1
1
car programmed to accept new amplifier and it is working as it should. $840 to fix, but I saved $120 by installing the amp myself.
 

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