Question about 2003 Volkswagen Passat

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Volkswagen Passat 2003 battery replacement memory saver

I am trying to replace the battery on my Volkswagen Passat. I was worried about the radio unit theft lock being triggered when I detach the battery terminals so I bought a Haynes Manual. The manual said that I should use something called a memory saver to save the radio and all module settings. Is this completely necessary? If so, can I use my Black 'n' Dekker portable power unit to plug into the cigarette lighter and save the memory? Any advice would be greatly appreciated.

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No go to advance auto parts and get a memo. saver that a 9volt hooks to not expensive

Posted on Feb 12, 2009

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2 Answers

Aftermarket stereo


MAKE SURE THAT U CONNECT ONLY THE WIRES NEEDED FOR THE UNIT TO OPERATE.CHECK ALSO AT THE CARS WIRING IF THERE IS AN EXTRA BROWN WIRE OUT OF THE WIRING FOR THE RADIO.LET ME KNOW.ALSO IF THE AFTER MARKET RADIO HAS A DETACHABLE FRONT FACE.

Mar 28, 2015 | 2001 Volkswagen Passat

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Someone was telling me that there is a special tway needed o change a battery in a volkswagon passat. Is this true?? i never heard of this?


there is only some steps you have to do before you change the battery So as to avoid losing any codes (radio and anther some features for automatic doors lock when 20k/m speed,,,,) keep radio off ,all doors unlock ignition key outside your car.then replace battery .

Jun 20, 2011 | 2003 Volkswagen Passat

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How do i replace the battery on a 2003 Passat


Be sure to use an auxillary input voltage device (memory savor) so you do not lose ECM TCM and radio programming. Most cars have a seperate battery for this, but VW does not. It plugs into the cigarette light and supplies a small amout of power to vital systems. I picked one up at harbor frieght for $5.
Also, make sure the car is OFF. Disconnect the negative cable before the posative, and install after the posative cable.
Always match the AMP ratings or go higher, because of cable resistance building up over time and wear to the starter. Replacing the cables and starter would fix this issue, but add much cost.
Good Luck.

Mar 03, 2010 | 2003 Volkswagen Passat

1 Answer

How do i change the battery in a passat, it's very tight what do i have to remove


It is a pain. I remove the cabin air filter to give me room to side it out the passenger side.
Disconnecting the power from you VW passat will be a major issue if you do not use an energy saver to keep the power going to the ECM TCM and radio. I got mine at harbor freight for $5.
It is know as an Auxillary Power Voltage Input Device. It plugs into the cars cigarette lighter, and is powered by another 12v car battery or a small 9v battery, if it is a quick job.
The EngineControlModule & TransmissionControlModule will need to be flashed/reprogrammed if the power is lost. Unless you own some very expensive software, you will need the dealer for this.
Good Luck!

Feb 22, 2010 | 2003 Volkswagen Passat

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Changing the battery and alternator in 2003 passat will i need any codes to start car or run car or turn on radio?


All you will need are the radio code.That should be in your audio book that came with the car.If not then you can get it from your dealer ok good luck.

Jan 16, 2010 | 2003 Volkswagen Passat

1 Answer

How do I replace the battery of a 2004 VW passat, so I don't loose the radio codes.


you can purchase an adapter for the cigarette lighter to prevent this, otherwise hook up another battery to the car while exchaning batt, use booster cables

Nov 27, 2009 | 2004 Volkswagen Passat

1 Answer

How do you remove/replace alternator on 2003 VW Passat 2.8 L V6 GXL ?


LET VOLKSWAGEN DEALERSHIP FIX IT.BECAUSE ONCE YOU DISCONNECT THE NEGATIVE BATTERY CABLE.YOUR PCM WILL LOSE IT MEMORY CAUSING NO START PROBLEMS.IT TAKES A SPECIAL SCANNER TO REPROGRAM CAR.

Oct 03, 2009 | 2003 Volkswagen Passat

1 Answer

I lost id code security code use radio panasonic cq-vw100u


Unfortunately radio codes for the VW Panasonic radio (using the Serial Number) will not be available for free from anywhere on the Internet.

Try your Main Dealer .....or a Decoding Service (who will plug it into a laptop to read the code in your radio memory chip )

Jul 28, 2009 | 2003 Volkswagen Passat

2 Answers

1999 Passat 1.8 liter: power steering out, generator light on


alternator may be starting to fail dont trustit have diagnosed by qaulified tech.

Jul 01, 2009 | 2003 Volkswagen Passat

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