This procedure covers the replacement of the main power distribution center (PDC) relay in the 2012-2018 Jeep Wrangler JK with the 3.6L V6 engine, located in the engine compartment fuse box.

Warnings

Tools required

Parts

• Main relay (specific to relay position - verify PDC diagram) × 1 — Use OEM specification

Preparation

1. Park vehicle on level ground and engage parking brake
2. Turn ignition to OFF position and remove key
3. Allow engine to cool if recently operated
4. Locate the Power Distribution Center (PDC) in the engine compartment on the driver's side firewall area
5. Identify the specific relay to be replaced using the diagram on the underside of the PDC cover

Procedure

1. 1

   Disconnect battery negative terminal
   Using a 10mm socket, loosen the negative battery terminal bolt. Remove the negative cable from the battery post and isolate it away from the battery to prevent accidental contact during the repair.
   Torque spec

   Battery Terminal Bolts8 Nm (6 lb-ft)
2. 2

   Remove PDC cover
   Release the latching tabs on both sides of the Power Distribution Center cover by gently prying or pressing the release mechanisms. Carefully lift the cover straight up to expose the relays and fuses inside. Keep the cover accessible to reference the relay identification diagram.
3. 3

   Photograph relay positions
   Before removing any relays, take a photo or make a note of the exact position and orientation of the relay to be replaced. This ensures correct installation of the new relay.
4. 4

   Remove the main relay
   Grasp the relay firmly by its body (not the terminals) and pull straight up with steady, even pressure. If the relay is difficult to remove, use a relay puller tool or carefully use a small flathead screwdriver to gently pry up on alternating sides while pulling. Avoid bending the relay terminals in the PDC base.
5. 5

   Inspect relay socket
   Examine the relay socket terminals in the PDC for corrosion, discoloration, or damage. Check for any foreign debris or moisture. If corrosion is present, clean the terminals with electrical contact cleaner and allow to dry completely before proceeding.
6. 6

   Install new relay
   Verify the new relay matches the part number and amperage rating of the original. Optional: apply a small amount of dielectric grease to the relay terminals to prevent future corrosion. Align the relay terminals with the socket, ensuring correct orientation, and press the relay firmly into the socket until it seats completely flush with the PDC base.
7. 7

   Reinstall PDC cover
   Position the PDC cover over the fuse box, ensuring no wires are pinched. Press down firmly on both sides until the latching tabs click into place securely. Verify the cover is fully seated and cannot be lifted without releasing the tabs.
8. 8

   Reconnect battery negative terminal
   Clean the battery post and cable terminal if corrosion is visible. Place the negative cable onto the negative battery post and hand-tighten the terminal bolt. Using a torque wrench and 10mm socket, tighten the battery terminal bolt to specification.
   Torque spec

   Battery Terminal Bolts8 Nm (6 lb-ft)

Reassembly

1. Ensure the PDC cover is properly latched and secured on both sides
2. Verify no tools or parts are left in the engine compartment
3. Check that the battery terminal connection is tight and corrosion-free

Verification

• Turn the ignition to the ON position (do not start engine) and verify dashboard warning lights illuminate and then extinguish normally
• Start the engine and verify it starts normally without hesitation
• Test all electrical systems controlled by the replaced relay (refer to PDC diagram for relay function)
• Verify no new warning lights appear on the instrument cluster
• Check for proper operation of affected circuits under load conditions if applicable
• Re-initialize power windows if necessary: with ignition ON, fully lower each window, then raise it fully and hold the switch up for 2 seconds

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