Why has my icom stopped showing position and time.It is wired to a multiplexer

Hi,

please move the radio away from it's current position to attempt to find alternative position where it's frequency will be transmitted clearly as intended. Also, please keep away from any microwaves or speakers so as not to cause any interference. Thank you.

From your description it would seem the towing electrics have been incorrectly wired or perhaps the problem is with your trailer.

My advice is to go back to basics, get yourself a diagram and investigate as deep as necessary. Your car is probably filled with digital electronics including a multiplex lighting system. If the towing electrics are an official GM kit there should be no problems but if it has been wired the old fashioned way a multiway relay should be used to prevent the trailer drawing/interfering with the multiplexed vehicle lights.
That is the safest way but it does mean the circuit becomes more complex.

You've probably already found the answer to this question but doing a search for D104 wiring to ICOM will show you what you need. If the connector is the 8 pin circular one, then the PTT and MIC connections are the same for all ICOM radios.

Peter, check your antenna, and try switching your am/fm button a bunch 15 to 20 quickly, of times to see if it is a bad or dirty switch.
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Sounds like there is a coupler in the multiplex that may not be fully connected. Multiplex is the control switches on the drivers door. If the issue is sporadic sometimes it is getting power and sometimes its not.

The manual for your Icom R10 can be downloaded here:

http://www.rigpix.com/icom/icr10_manual.pdf

Pay particular attention to pages 7 & 8, as they deal specifically with NiCad & Alkaline battery usage and the charge switch.


The modifications available for te Icom R10 can be downloaded here for free (registration is required):

http://www.mods.dk/index.php?ModelId=350&RadioRec=icom

pull up the i.s. wiring code from that time
i.s. international standards.
the code change a few years ago

I have had similar situations with the multiplexer where individual lines stopped working. I would recommend to just go to ebay and search for a replacement there. The used devices are usually so cheap that it is not worth opening up and repairing the quad bri.

I had this problem about a year ago. If all you need is the firmware update they will update it at no charge and they told me if it needs repairs they most likely will not have the parts becaus it is a discontinued model. They also said they did checked it and found no other problems. Sent it in to Icom:
Icom America
2380 116th Ave NE
Bellevue WA 98004
They did the firmware update and sent it back to me free of charge. It works great now and my chart cards work great.