Worms
Member Since: 24 Sep 2023
Location: Highlands
Posts: 401
  
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Last night I was picking my son up at the station and he appeared just as I was switching the engine off, so it was a very quick off/on. When switched back, on the dash was showing an EPB fault - EPB hadn't been switched on and I know that the ECUs don't like an incomplete power down/power up, so I switched it off, then ignition on, waited until all the lights went out and started it up again. No EPB light, so all good, so far... This morning, no radio - well actually, radio lights up but no sound. Buttons to change station do nothing. FM/AM/CD/Aux buttons work, but no sound from CD. CD changer works but play doesn't start. Buttons on steering wheel work, but still no joy from the radio/cd player. No fault codes showing, but I did briefly see a "low power mode" on the radio info screen, despite GAP showing 12.4v at this point (engine off).
Taking my life in my hands, I reflashed the ECU and after the usual, heart-stoppingly-long 1 min 20s process, all back to normal and radio working as it should. So what would cause this? Why no "lost connection", or similar, fault code? And was there a better way to cure the fault? Reflashing the whole car seems a bit extreme for a radio issue!  Previously:
2010 FL2 TD4e GS
‘93 Defender 110 200TDi CSW - still got this, non-runner on SORN.
‘87 Defender 90 4 cyl Petrol
‘83 110 CSW V8 - best ever!
Range Rover 2-door V8 (not sure of year - 4-speed box and vacuum diff switch)
Series III SWB Diesel
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 30th Jan 2024 9:25 am |
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DIY Ace
Member Since: 06 Feb 2019
Location: Hampshire
Posts: 971
 
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I had similar just two weeks ago - radio on but no sound etc. I just pulled the fuse in the CJB for a few minutes before replacing it and all was fine. 2022 BMW i4 M50. Bought Oct 2022. 10,200 miles and counting...
2014 BMW 435d convertible. Bought July 2021. 58,000 miles and counting...
2005 Discovery 3 HSE Auto. Bought Feb 2019. 169,000 miles and counting...
2009 Freelander 2 XS Manual. Bought Sep 2013. SOLD Aug 2021 (already regretted!)
https://youtube.com/channel/UCO_u_0D45x9KGfiNstzLJnw
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| 30th Jan 2024 11:00 am |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10682
 
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I suspect it was the reset at the end of the process that sorted it, rather than the flash.
Try a clear all fault codes next time. See if that helps. or remove the radio fuses 52/53? behind the glovebox
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| 30th Jan 2024 12:09 pm |
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Worms
Member Since: 24 Sep 2023
Location: Highlands
Posts: 401
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Thanks both. I had done a number of clear all faults and a couple of power-off/power-ons, with no change, which was why I resorted to the Flash ECUs approach. I had been thinking that since there was power to the radio, then it wasn't a fuse issue, but hadn't thought-through that the radio would have remained powered-up during a switch-off/switch-on cycle unless I waited the ten minutes or so for it to completely power down.
Not sure if it is related, but I sometimes get a buzzing from behind the radio during that period when the ignition is turned off but before the car has gone to sleep. Previously:
2010 FL2 TD4e GS
‘93 Defender 110 200TDi CSW - still got this, non-runner on SORN.
‘87 Defender 90 4 cyl Petrol
‘83 110 CSW V8 - best ever!
Range Rover 2-door V8 (not sure of year - 4-speed box and vacuum diff switch)
Series III SWB Diesel
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| 30th Jan 2024 5:21 pm |
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