I have a 2000 rodeo. I replaced the alarm timer control unit to fix a problem with the intermittant wipers. Last week, however, the horn and alarm siren (smaller horn unit) stopped working. They sound off fine if I jump them to a hot terminal.

My guess is that I need to replace the same part again. When I hit the remote door lock control, I hear a relay clicking in the keyless entry module.

Does anyone have any experience with this? I want to make sure I replace the right part since they are pretty expensive and the parts house offers no returns on this stuff.

Thanks
A.

the only other thing you may try is check to be certain your anti theft module has been properly connected thats the smaller module that sits a bit lower tha the alarm relay module. if that does not work try underhood fuse box EB-2 10A horn fuse check it if ok then disconnect the anti theft module and try this pin # 10 in the connector is a green w/white wire with the ignition on jump this wire to ground if the horn sounds then your problem is in the anti theft module.

sorry I said disconnect the antitheft module (wrong ) it will need to be connected in order for pwer to get to it when the key is turned on