Help required please!

Angry Koala · 11th June 2007, 08:41 AM

Whilst I'm extremely happy overall with my new car the stereo is really starting to get on my t*ts!

When I bought it the guy said that when he had taken the car out the garage after 6 months the stereo was playing up with interference. I tried it, it worked fine. 400 miles later I had had no problems with it at all (bandwidth expander seemed to work fine and CD player was perfect).

Next morning I switch it on and go deaf with the worst hiss/crackle I've ever heard - I thought maybe it was a loose aerial connection but it was doing the same with CDs (also makes a noise as if scrambling CD's).

Anyway me and Baz took the dash off yesterday to get to the stereo to try to find the cause. Checked the earth which appeared fine, rewired the live feed and insulated it properly as it had previously been poory soldered and taped. Nothing solved it until we disconnected the bandwidth expander and then everything worked perfectly. Thinking that was the problem and I needed to start looking for a new B.E we put everything back in and it worked fine. 2 minutes up the road switch the stereo on and it's all gone wrong again.......

Unit is a double din Panasonic jobbie.

Anyone got any thoughts please cos it's driving me nuts?!?!

Martin F · 11th June 2007, 10:13 AM

IMO sounds like a problem in the PA stage of the stereo. Suspect you will need to take it out and let a repair guy bench test it.

Or, just a thought is the stock amp still wired in? (under passanger seat)

Adzy's Straight 6 · 11th June 2007, 10:31 AM

Alrite mate, iv gota jap spec with the original double din, and iv got the same problem, my band expander has made no differece, however this wkend im ripping it all out and completely installing a new system so hopefully that ought to solve it, but other that i just put it down to bad wiring.

Angry Koala · 11th June 2007, 10:44 AM

Quote:

Originally Posted by Martin F

IMO sounds like a problem in the PA stage of the stereo. Suspect you will need to take it out and let a repair guy bench test it.

Or, just a thought is the stock amp still wired in? (under passanger seat)

I assume it's still wired as the only thing different that's been done to the system as far as I know is to fit the bandwidth expander.

If the stock amp is under the passenger seat though, what the hell are the boxes clamped to the top of the head unit? There's one cream coloured one which is the same width as the unit not as deep and only about 2 cm thick (which we'd assumed was the stock amp) and another smaller brown box on top of that (which we'd assumed may be a suppressor).

UltraFlynn · 11th June 2007, 10:52 AM

One is the cruise control ECU. (Brown one i think)

Martin F · 11th June 2007, 11:15 AM

Nope, one is the AC Amplifier (the larger one) and the smaller brown one is the antenna control relay.

UltraFlynn · 11th June 2007, 11:17 AM

There you go. I show my ignorance again.

I'm sure the Cruise ECU is in that region though.

Martin F · 11th June 2007, 11:55 AM

Nah, it's up behind the dash roughly where the speedo is towards the bulk head.

May be thinking of the active spoiler or ABS ECU which are below the stereo.

Angry Koala · 11th June 2007, 02:05 PM

Anyway......... lol, where were you going with the stock amp thought Martin?

Martin F · 11th June 2007, 02:28 PM

If it is still connected then maybe it's that, which is faulty rather than the head unit. If so you should be able to try or buy one from somebody else. Alternatively take it out of the loop for a while.

Process of elimination, etc.

11th June 2007, 08:41 AM	#1
Angry Koala Senior Member None - Don't currently own a MKIV Supra. Join Date: Apr 2007 Location: uk Posts: 521	Help required please! Whilst I'm extremely happy overall with my new car the stereo is really starting to get on my t*ts! When I bought it the guy said that when he had taken the car out the garage after 6 months the stereo was playing up with interference. I tried it, it worked fine. 400 miles later I had had no problems with it at all (bandwidth expander seemed to work fine and CD player was perfect). Next morning I switch it on and go deaf with the worst hiss/crackle I've ever heard - I thought maybe it was a loose aerial connection but it was doing the same with CDs (also makes a noise as if scrambling CD's). Anyway me and Baz took the dash off yesterday to get to the stereo to try to find the cause. Checked the earth which appeared fine, rewired the live feed and insulated it properly as it had previously been poory soldered and taped. Nothing solved it until we disconnected the bandwidth expander and then everything worked perfectly. Thinking that was the problem and I needed to start looking for a new B.E we put everything back in and it worked fine. 2 minutes up the road switch the stereo on and it's all gone wrong again....... Unit is a double din Panasonic jobbie. Anyone got any thoughts please cos it's driving me nuts?!?!

11th June 2007, 10:13 AM	#2
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	IMO sounds like a problem in the PA stage of the stereo. Suspect you will need to take it out and let a repair guy bench test it. Or, just a thought is the stock amp still wired in? (under passanger seat) __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

11th June 2007, 11:15 AM	#6
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	Nope, one is the AC Amplifier (the larger one) and the smaller brown one is the antenna control relay. __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

11th June 2007, 11:55 AM	#8
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	Nah, it's up behind the dash roughly where the speedo is towards the bulk head. May be thinking of the active spoiler or ABS ECU which are below the stereo. __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

11th June 2007, 02:28 PM	#10
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	If it is still connected then maybe it's that, which is faulty rather than the head unit. If so you should be able to try or buy one from somebody else. Alternatively take it out of the loop for a while. Process of elimination, etc. __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

11th June 2007, 10:31 AM	#3
Adzy's Straight 6 Member Jap Spec RZ - Auto (TT) Join Date: Mar 2007 Location: Warwick Posts: 171	Alrite mate, iv gota jap spec with the original double din, and iv got the same problem, my band expander has made no differece, however this wkend im ripping it all out and completely installing a new system so hopefully that ought to solve it, but other that i just put it down to bad wiring.

11th June 2007, 02:05 PM	#9
Angry Koala Senior Member None - Don't currently own a MKIV Supra. Join Date: Apr 2007 Location: uk Posts: 521	Anyway......... lol, where were you going with the stock amp thought Martin?

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