I recently repaired the combo switch for the dash/rear brake lights. No problem. No more getting pulled over! The next day the radio and the heat stopped working - simultaneously. They had been working prior. Where do I start to dx - other than fuses ('90 Civix DX)? Thanks.

 

It' s difficult to see any connection to the combination switch work that you did (pictures). Check whether fuses 12 (15A) (Stereo) and 19 (30A) (Blower) (Auxiliary fuse holder) are blown.

Clarification: When you say the heater doesn't work, do you mean that the blower doesn't work or that the blower works but blows only cold air?

 

Clarification: When you say the heater doesn't work, do you mean that the blower doesn't work or that the blower works but blows only cold air? The blower doesn't turn on. There are five speeds to it, including OFF. I did check the fuses; they appear ok. Any thoughts?

 

Check the rear connectors for radio and blower motor and switch. Bad blower motor or fan switch or corresponding wiring? Dead radio?