I have an power lock issue with my civic 1996. All the passenger locks stop working at the same time. Only the driver one works with the switch on the driver side.
I have opened the panel and examined everything, control units, wire, etc...They seem to be in good condition. My next steps is to try to replace the lock control unit, although I think it still look decent without any crack or burn signs.

Any input for the next step would be appreciated. I do have the wiring diagram.
Thank you
P.S: wanted to add that I don't have the keyless entry. According to the diagram and the manual repair service, I should not have to check the radio wiring. But let me know if I am wrong

 

Attached is some pics

 

Again, check for broken wires in the front door jamb connectors.

 

After market radio will cause that for the door locks, windows don't know.

 

I don't think this has anything to do with the radio. I don't have the keyless entry. Also I did not do anything with the radio recently. I did replace my stock radio with the after market one 3 years ago. But everything worked fine after I replaced the stock radio at that time

 

Quick update. I found broken wires as driver door jamb. That is the issue.
See this post for details