2. Check the turn signal switch. The turn signal switch is located on the steering column. If the switch is faulty, it will not send power to the turn signals, defroster, or heater.
3. Check the wiring. The wiring for the turn signals, defroster, and heater is located behind the dashboard. If there is a break in the wiring, it will prevent power from reaching the components.
4. Check the relays. The relays for the turn signals, defroster, and heater are located in the fuse box. If a relay is faulty, it will not allow power to reach the components.
5. Check the grounds. The grounds for the turn signals, defroster, and heater are located on the chassis of the car. If the grounds are not clean and tight, it will prevent power from reaching the components.
6. Check the heater control panel. The heater control panel is located on the dashboard. If the control panel is faulty, it will not send power to the heater.
7. Check the defroster control panel. The defroster control panel is located on the dashboard. If the control panel is faulty, it will not send power to the defroster.
8. Check the HVAC control module. The HVAC control module is located behind the dashboard. If the module is faulty, it will not send power to the heater or defroster.
If you have checked all of these components and the turn signals, defroster, and heater still do not work, you may need to take your car to a mechanic for further diagnosis.
