[modern] Door Locks Problem

My doors don’t lock most of the time, but sometimes they tend to work fine.
Last night I opened up the little computer box that sits below the glove
box. This box is black, about 2 inch x 7 inch x 1 inch. It has 2 relays,
one locks the doors and the other unlocks them. The relay that locks the
doors seem to work all the time when I use my key or one of the lock pins,
but the other one fails to work when I use the key or one of the lock pins.
If I activate the unlock relay with my finger it seems to unlock all the
doors. I looked at the solder joints and relays carefully but didn’t find
anything wrong. Where should I be looking next?

Thanks,
Quang
89 XJ40