However, here are some common functions controlled by relays in a vehicle like a 1997 Chevy Blazer:
* Headlights: A relay typically switches the high current needed for the headlights, protecting the smaller switches in the interior.
* Horn: The horn relay provides the necessary current for the horn to operate.
* Fuel Pump: A critical relay, activating the fuel pump to deliver fuel to the engine.
* Cooling Fans: Relays control the engine cooling fans, switching them on and off based on engine temperature.
* A/C Compressor: The A/C compressor clutch is often controlled by a relay.
* Ignition System (Coil): Could be one or more relays, depending on the specific ignition system.
* Power Windows/Locks: These may use individual relays or be part of a larger power distribution system.
* Wiper Motors: The wiper motor(s) usually have their own relay.
* Turn Signals/Hazard Lights: These often share a relay or have individual ones.
* Power Seats (if equipped): Electrically controlled seats use relays.
To find out what each specific relay controls *on your Blazer*, you need to:
1. Locate the relay box(es): These are usually found under the hood or in the interior fuse box.
2. Consult a wiring diagram: A wiring diagram, specific to your 1997 Chevy Blazer, will show you which relay controls which circuit. You can often find these online through repair manuals (like Haynes or Chilton) or specific automotive websites. The diagram will usually show the relay location, number, and the component(s) it controls.
3. Use a multimeter (carefully!): As a last resort, with the diagram in hand, you can carefully use a multimeter to trace the wiring from each relay to determine its function. Caution: Be aware of electrical hazards. Disconnect the battery's negative terminal before attempting this.
Without a wiring diagram, providing a definitive answer to your question is impossible.
