as i mentioned in my second post, i went to the dealer for the code. even professional decoders said this model could not be done via serial no. i did obtain a clarion decode tool but it didn't work on my model either. but if you fancy a go then the serial no. is CR0154T0014140 and the model no. is PU-9836A. you tell what you think the code is and i'll tell you if your right. all the best.