I have recently purchased a 1998 Citroen Xantia fitted with a 4035 RDS Audio System which has a problem as follows:

1. The radio will ONLY work if the on/off and the BND buttons are depressed simultaneously, it will NOT work using the on/off button alone
2. When working stations change ok and all controls are fine (including steering column controls) but the radio emits a constant beeping sound
3. After running for only a few minutes the radio switches itself off.


I have a code which I presume is correct but I have not been able to recode the radio because whenever I press the BND button all I get displayed are the 4 dotted lines, no mention of CODE or CODE IN and I was thus unable to insert the code. I tried this both before and after disconnecting ( and reconnecting ) the battery.

Any advice on solving this problem would be appreciated.

Gordon, April 2010

The theftlock function of the radio has been activated.

There are 2 kinds of the theftlock function:

1. PIN-code. The radio requests a PIN-code after the power has been disconnected.

2. "Electronic marriage". The radio has the car's VIN number in its memory. If the number mismatches, a frequent beep sound is heard. The VIN number can only be changed using a EEPROM programmer or a dealer's equipment.

I think yours has the PIN-code as you can see 4 dashes on the radio display.

I think you're unable to enter the code as an invalid code has been entered several times.

To reset the radio unit, you should leave it turned on (showing 4 dashes). After 2-3 hours, the dashes will start blinking or the display will change to '0000'. Now you can enter the radio code. Be careful, after a certain number of invalid attempts it may lock up permanently.

A.R.S., October 2012

Hi, I have just got the same problem after replacing the battery & was looking for an answer when i found you had the same fault, did you ever manage to solve it?

Phil, May 2010