Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Accessory Relay: Description
The accessory relay is an electromechanical device that switches fused battery current to the accessory powered vehicle circuits when the ignition switch is turned to the Accessory or On positions. The delay feature will maintain power to the accessories for 45 seconds after the ignition is shut off or until a door is opened. This allows sufficient time to close windows and park the windshield wipers. The accessory relay is located in the Integrated Power Module (IPM) in the engine compartment.
The accessory relay is a International Standards Organization (ISO) relay. Relays conforming to the ISO specifications have common physical dimensions, current capacities, terminal patterns, and terminal functions.
The accessory relay cannot be repaired or adjusted and, if faulty or damaged, it must be replaced.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.