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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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.
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 .
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.
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.