Hi

I understand this is a common fault with the l322. I have an 02 plate. The radio will now not turn on, which also means I cannot select CD player or cassette. Everything else with the display works fine including sat nav, although no sound and television turns on but is muted.

I've taken out and stripped the dsp amplifier unit. It was not wet but looks like it was a t some point however there was no corrosion.
I cleaned it up, put it back, checked connectors which all looked good. Still no radio. No fuses blown.

I'm guessing the dsp has had it but could it be anything else and is there a way of finding out if there is power to the dsp?

I feel your pain here , been driving round without a stereo for months after my 2nd hand replacement unit went the same way as the original

Oh no. That isn't very reassuring. Did you replace the dsp or the tuner? I haven't taken a look at the tuner yet, it's raining bad again here.

The DSP isn’t an amp, it’s just a signal processor and crossover. The BM54 radio is the amp. That’s the silver unit lower down in the boot area, but you prob know where it is.

If you get DSP on your screen in white, then that unit is identifying itself on the ibus so is at least powered up.

 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

Mine does it every so often but then comes good after a vehicle shut down/restart. Ron B. VK2OTC
2004 L322 V8 Auto
2007 Yamaha XJR1300
Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA

mjdronfield wrote:

The DSP isn’t an amp, it’s just a signal processor and crossover. The BM54 radio is the amp. That’s the silver unit lower down in the boot area, but you prob know where it is.

If you get DSP on your screen in white, then that unit is identifying itself on the ibus so is at least powered up.

My replacement dsp unit finally arrived. Plugged it in and...nothing. not a god damn thing. I shall try disconnecting the battery tomorrow and hopefully that might reset the system somehow.

p38arover wrote:

Mine does it every so often but then comes good after a vehicle shut down/restart.

So I've tried a hard reset twice on the car today trying both dsp units and nothing. Tested it's getting a constant power but not switched power. I think the fault is with the radio tuner, the unit with the small 10amp fuse. So I have ordered a replacement and see what happens then.

An update.

Bought a replacement bm54 unit which I believe is the radio tuner and also sends power to the dsp. Bingo! We're back in business. From reading about there are components within the bm54 that burn out over time. This is what happened to mine because there was no evidence of water damage.

I now have a replacement dsp unit for sale and I've checked it's working on my car.