Hi - first post!

I have a 1999 Accord LX (just performed the 105,000 mile service and we're good to go) and need some advice about repairing the door locks. Here is the situation: The driver's side doors lock and unlock when using the inside driver's side button, however the passenger side doors remain unaffected. The driver's side doors also unlock when using the passenger side button, however the passenger side doors remain unaffected. When unlocking from the outside, passenger side lock with my key, the driver's side doors both unlock, as well as the front passenger side door. The rear passenger side door remains unaffected.

I can hear the relay clicking under the dash, as well as something happening inside the doors themselves during all of the scenarios. The rear passenger side door does not unlock with any method other than lifting up the stem by hand.

Any help would be greatly appreciated.