Rear Speaker failure on 4200
- Thread starter JonH
- Start date
Grinzzz
New Member
- Messages
- 925
Pretty simple to fault find speakers. Grab an AA or AAA battery and some wire.
Take the speaker out of it's housing (I'm assuming this is easier than getting the stereo out, if not do that bit first). Check connections look sound, wrap insulating tape around any bare wire or metal connectors on the wire. Whip the connections off the speaker and make a circuit with the wire and battery across the speaker, if you hear a scratching sound, speaker is good, if not, it's duff. Make sure it's not a duff battery first though!
Ok assuming thats fine now comes the difficult bit. You need to get a) the wiring diagram for the stereo and b) access to the wires going to the speaker in question. Perhaps someone that has a 4200 can tell you if it's a standard ISO connector to the stereo. If it is look up which connectors go to the speaker in question (while you're on note the other speakers too). If not you'll need to find the vehicle specific connections.
Ok, now get the stereo out (or access to the connector). Again no idea how to do that on a 4200. Once you've got access to the connector repeat the same trick with the battery. If you get noise the speaker and wiring is ok, try some contact cleaner on the connector, and reconnect to stereo and test. If you get no noise at that point then the stereo is duff.
When you do the battery thingy on the connector and you get no noise (assuming you've already tested the speaker) then the most likely cause is the wiring. You could test if it's an open circuit or a short at this point but it's pretty moot - you have to either trace the wire and repair/replace or run new wire out to the speaker.
Oh the bit about noting the other speakers...while you're on test those too. If you get noise from expected speakers it means you've probably identified the right connectors, just a way of ruling out you making a simple misidentification of the connectors.
Hope that helps
EDITED TO ASK: Does anyone know if theres an external amp on these systems? If theres a possibility of it being that check the fuses for that first - it basically adds an extra layer to fault find over the above. i.e. also check from the output of external amp to speakers.
Take the speaker out of it's housing (I'm assuming this is easier than getting the stereo out, if not do that bit first). Check connections look sound, wrap insulating tape around any bare wire or metal connectors on the wire. Whip the connections off the speaker and make a circuit with the wire and battery across the speaker, if you hear a scratching sound, speaker is good, if not, it's duff. Make sure it's not a duff battery first though!
Ok assuming thats fine now comes the difficult bit. You need to get a) the wiring diagram for the stereo and b) access to the wires going to the speaker in question. Perhaps someone that has a 4200 can tell you if it's a standard ISO connector to the stereo. If it is look up which connectors go to the speaker in question (while you're on note the other speakers too). If not you'll need to find the vehicle specific connections.
Ok, now get the stereo out (or access to the connector). Again no idea how to do that on a 4200. Once you've got access to the connector repeat the same trick with the battery. If you get noise the speaker and wiring is ok, try some contact cleaner on the connector, and reconnect to stereo and test. If you get no noise at that point then the stereo is duff.
When you do the battery thingy on the connector and you get no noise (assuming you've already tested the speaker) then the most likely cause is the wiring. You could test if it's an open circuit or a short at this point but it's pretty moot - you have to either trace the wire and repair/replace or run new wire out to the speaker.
Oh the bit about noting the other speakers...while you're on test those too. If you get noise from expected speakers it means you've probably identified the right connectors, just a way of ruling out you making a simple misidentification of the connectors.
Hope that helps
EDITED TO ASK: Does anyone know if theres an external amp on these systems? If theres a possibility of it being that check the fuses for that first - it basically adds an extra layer to fault find over the above. i.e. also check from the output of external amp to speakers.