Replace a faulty relay in the engine compartment or interior fuse/relay box on a 2018-2024 Toyota Camry 2.5L I4.

Warnings

Tools required

Parts

• Replacement relay × 1 — Use OEM specification - verify amperage and part number from relay box diagram

Preparation

1. Park vehicle on level surface and turn off ignition
2. Locate the specific relay requiring replacement using the owner's manual or fuse box diagram (engine compartment box on driver's side or interior box below steering column)
3. If replacing a high-current relay (fuel pump, starter, cooling fan), disconnect negative battery terminal using 10mm wrench
4. Allow engine to cool if working in engine compartment

Procedure

1. 1

   Access the relay box
   For engine compartment relays: Release the clips on the fuse/relay box cover and remove it. For interior relays: Remove the lower dashboard panel by pulling it toward you to release the clips, then access the interior fuse/relay box.
2. 2

   Identify the target relay
   Use the diagram on the fuse box cover or in the owner's manual to locate the specific relay. Common Camry relays include EFI (electronic fuel injection), cooling fan, horn, headlight, and ACC (accessory). Note the relay's amperage rating and position.
3. 3

   Test the existing relay (optional)
   If diagnosing, test the relay operation by listening for a click when the circuit activates, or use a multimeter to check for continuity across the coil and switch terminals per the relay diagram.
4. 4

   Remove the faulty relay
   Grasp the relay firmly using a relay puller or needle-nose pliers. Pull straight upward with steady pressure to extract the relay from its socket. Avoid rocking side-to-side which can damage the socket terminals. Inspect the relay terminals and socket for corrosion or damage.
5. 5

   Install the new relay
   Verify the replacement relay matches the amperage rating and pin configuration of the original. Align the relay tabs with the socket slots and press firmly straight down until fully seated. The relay should click into place and sit flush with the relay box.
6. 6

   Reinstall covers
   Replace the fuse/relay box cover ensuring all clips engage properly. For interior work, reinstall the lower dashboard panel by aligning the clips and pressing until they snap into place.
7. 7

   Reconnect battery if disconnected
   If the battery was disconnected, reconnect the negative terminal and tighten the terminal bolt to specification.
   Torque spec

   Battery Terminal Bolts6 Nm (4 lb-ft)

Reassembly

1. Ensure all fuse box covers are properly secured to prevent moisture intrusion
2. If battery was disconnected, reset the clock and radio presets, and allow the vehicle to idle for 5 minutes to relearn idle parameters

Verification

• Turn ignition to ON position (engine off) and verify the system controlled by the relay functions properly
• Start the engine and test the relay-controlled component under normal operating conditions
• Listen for proper relay clicking when the circuit activates (cooling fans, fuel pump prime, etc.)
• Verify no warning lights appear on the instrument cluster related to the replaced relay circuit

More procedures for this vehicle