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Stereo plays on acc. after u start engine plays 2-3 seconds

Then sound cuts off but stereo still on

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IS THERE AN AMP? ARE YOU SURE YOU HAVE DECK/ AMP HOOKED UP TO A CONSTANT "KEY ON" POWER SOURCE? I WOULD GET A TEST LIGHT(REAL CHEAP AT WALMART, OR AUTOPARTS STORES) AND SEE IF MAIN WIRE IS NOT A TIMED KEY ON CIRCUT.... ALSO IF AMP IS BEING USED MAKE SURE ITS HOOKED TO REMOTE ON WIRE(USUALLY BLUE WIRE) AND NOT POWER ANTENNA LEAD OR SOME OTHER TEMP/TIMED POWER LEAD. GOOD LUCK

Posted on Feb 13, 2009

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Posted on Jan 02, 2017

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After market stereo works with key in acc. Does not work with engine running. There is power 14.0+ V in both the continuous power wire(yellow) and acc power wire when started (red) going into head unit....


Most, if not all cars will shut off accessory power when cranking so that the starter has plenty of current.
If your stereo doesn't come back on again once the car is running, that's a different story... is it a cheap and nasty unit?

Nov 03, 2013 | Car Audio & Video

1 Answer

New stereo hook up


You better read up on class 2 serial data communication networks . Does supply ACC voltage to anything . Your vehicle has many different control modules , PCM / ECM , air bag , ABS , BCM instrument cluster ,an the radio an some others . If you mess with or ground this wire your vehicle will not start or do anything .

The data link connector (DLC) allows a scan tool to communicate with the class 2 serial data line. The serial data line is the means by which the microprocessor-controlled modules in the vehicle communicate with each other. Once the scan tool is connected to the class 2 serial data line through the DLC, the scan tool can be used to monitor each module for diagnostic purposes and to check for diagnostic trouble codes (DTCs). Class 2 serial data is transmitted on a single wire at an average of 10.4 kbps. This value is an average; class 2 uses a variable pulse width modulation to carry data and depending on the message it may operate faster or slower. The bus will float at a nominal 7 volts during normal operation. Each module can pull this lower during the transmission. The bus is not at battery positive voltage or ground potential during normal operation. When the ignition switch is in RUN, each module communicating on the class 2 serial data line sends a state of health (SOH) message every 2 seconds to ensure that the module is operating properly. When a module stops communicating on the class 2 serial data line, for example, if the module loses power or ground, the SOH message it normally sends on the data line every 2 seconds disappears. Other modules on the class 2 serial data line, which expect to receive that SOH message, detect its absence; those modules in turn set an internal DTC associated with the loss of SOH of the non-communicating module. The DTC is unique to the module which is not communicating; for example, when the inflatable restraint sensing and diagnostic module (SDM) SOH message disappears, several modules set DTC U1088. Note that a loss of serial data DTC does not normally represent a failure of the module that set it.
On some vehicles, if the powertrain control module (PCM) is unable to communicate with the vehicle theft deterrent (VTD) system after the vehicle has started, the PCM will consider the VTD system to be malfunctioning. The PCM will enter a fail enable state and will command the security indicator to illuminate. When the PCM is in a fail enable state, the vehicle will NOT stall or stop running. If the PCM is in a fail enable state when the ignition is switched OFF, the PCM will remain fail enable until communications with the VTD system has been restored. When the PCM is in a fail enable state, the VTD system is NOT active and the vehicle will start. This feature is NOT available on all GM vehicle lines.

You need a interface module for your radio to work . Go to a professional installer place an talk with them . Your vehicle may not have all of these modules , but most .

Class 2 Serial Data Line
The class 2 serial data line on this vehicle is a star configuration. The following modules communicate on the class 2 serial data line:
• The body control module (BCM)
• The digital radio reciever
• The driver door module (DDM)
• The electronic brake control module (EBCM)
• The front passenger door module (FPDM)
• The HVAC control module
• The inflatable restraint sensing and diagnostic module (SDM)
• The instrument panel cluster (IPC)
• The memory seat module (MSM)
• The powertrain control module (PCM)
• The radio
• The radio amplifier
• The rear seat audio (RSA) controller
• The rear seat entertainment (RSE) assembly w/U42
• The rear wheel steering control module
• The remote playback device-CD player w/U1S
• The transfer case shift control module
• The transmission control module (TCM) w/Allison Transmission
• The theft deterrent control module
• The vehicle communication interface module (VCIM) w/UE1

GM Class II RDS Radio 12V Ignition Wiring

Mar 01, 2017 | Chevrolet Silverado 1500 Cars & Trucks

2 Answers

I have a memorex stereo, turntable, 3 cd changer etc. The standby light comes on but no sound, it is only 2 yrs old..


Sometimes you have to unplug it for about 30 seconds, then when you plug it in press the power on button. If there is still no sound, check the speaker connections on the back they sometimes come loose.

Oct 17, 2009 | Electro Brand Nostalgic Stereo CD Music...

1 Answer

I bought a boat with a clarion cd/stereo head unit. I noticed a problem while trying to play the radio that the speakers continually cut out. I get music for 2-3 seconds, then a popping sound, followed by...


try taking antenna lead out of set and put a length of wire into the center hole were the antenna fits then scan,you should pick up at least one station,if you do fit a new antenna,if not try switching off any traffic anouncement services on the set ie press and hold button marked either ta/rds/tta/ast
Topspark

Aug 21, 2009 | iLO XM-MP3-CD Car Stereo

1 Answer

Citroen Saxo CD Player will not play when engine running


The car stereo has 2 +12V inputs: the constant batt input and the key in one.
So actually the stereo is always connected to +12V, even in standby.
When you turn your key, the key in input also starts, thus starting your stereo instantly.
When you turn the ignition on, the key in input is switched off for a couple of seconds, so that all the power goes to starting your engine.
After that key in input should be back on - this is your problem here.

One possible solution would be to cut this wire out, and split the RED battery +12V cable so that it enters in the key in input as well. Check wiring diagrams!.

Test this with cables out (without reinstalling the whole thing back in) and if it works.......leave it and put everything back in.

Only downside is, you have to turn off the radio by hand when you exit your car - or you could lose all battery power !

Jan 16, 2009 | Car Audio & Video

1 Answer

DehP6700 mp restet everytime keys is turned on.


first red is ignition or acc (turns off and on with the key) yellow is constant power (always hot keeps memory) orange is illumination (lights up radio) if vehicle doesnt have a seperate illumination wire connect it to the ignition wire. now process of elimination your ground is correct because it worked with all wires to acc your acc works because u had all them connected to it and it worked your problem is in your yellow or constant/memory i suggest u test it again take piece of wire any old thing long enough will do and run the wire directly from the battery under the hood and just run it outside the car through the window and connect it directly to the yellow wire make sure u have a good connection at the battery on the positive side if u have test light or volt meter test the wire before connecting it to the radio if it works then u know there is a problem with the wire from the vehicle (fuse wrong wire bad wire ) if it doesnt work make sure ground is connected tight and that paint is cleaned of the surface where ground connects and that the yellow wire to the radio is tight in the back of the radio.

Nov 13, 2008 | Car Audio & Video

1 Answer

Pioneer avh-p5700dvd (winning soung)


I had the same issue with mine. All I did was reconnect my ground. (cleaned the surface abit better but now it works)

Oct 09, 2008 | Pioneer AVH-P5700DVD Car DVD Player

1 Answer

Sony slv 715ub no stereo sound on tape playback


Hi, i have a Panasonic dmr-es30veb DVD ram recorder/VCR and i cant record one channel while watching another, as you can tell i am not at all technically minded and if you can help i would be grateful many thanks Eileen.

May 13, 2008 | Sony SLV-N750 VHS/S-VHS playback VCR

1 Answer

No music from player #1 port


i have noticed that playing two player with the sound too.. my disk was dirty too.clean it first.. Second if your just playing through your T.V. well its prob mono.. or if your playing through a home audio/video check your audio rca's make sure there pluged in all the way. if you are using home stereo newer model you can use the fiber optic on your ps2 the sound is better make sure your stereo has the same thing or it would be a wasted trip to the store.

Dec 15, 2007 | Sony PlayStation 2 (PS2) Console

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