electrical

Horn Relay

for 2003 Dodge Viper 8.3L V10 · RWD

Difficulty

Easy

Time

36 min

Tools

Steps

✓Fact-checked. Built from OLP's spec database, then independently fact-checked line by line with every correction applied. Master-tech sign-off by Chris Hackleman is queued. Cross-check torque values against the factory manual, and stop if anything looks unsafe. How our data is made.

This procedure guides you through locating and replacing the horn relay in the Power Distribution Center (PDC) under the hood of a 2005 Dodge Viper.

Warnings

⚠Disconnecting the battery will erase radio presets and may require drivetrain re-learning on first start.

ℹ️The horn relay is a small cube-shaped component approximately 1 inch square, typically mounted in a socket within the PDC.

Tools required

10mm socket or wrenchEssential

Needle-nose pliers

Electrical contact cleaner

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Parts

Horn relay × 1 — Mopar 56051115AA or equivalent mini ISO relay

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Preparation

Park vehicle on level surface and set parking brake
Turn ignition off and remove key
Allow engine to cool if recently driven
Open hood and secure with hood prop

Procedure

1
Disconnect battery negative terminal
Locate the battery in the engine compartment. Verify the exact battery location for your vehicle before proceeding. Using the appropriate size wrench (verify fastener size for your vehicle), loosen the negative (black) battery terminal bolt and disconnect the cable. Secure the cable away from the terminal to prevent accidental reconnection.
Torque spec
Battery Terminal Bolts6 Nm (4 lb-ft)
2
Locate the Power Distribution Center
The PDC is located in the engine compartment on the driver side inner fender area, near the strut tower. It is a black plastic box approximately 8 inches by 6 inches with multiple electrical connectors and a removable cover.
3
Remove PDC cover
Release the cover retaining tabs on each side of the PDC by pressing inward and lifting upward. The cover should release without tools. If equipped with fasteners, remove the fasteners before lifting. Set the cover aside in a clean area.
4
Identify the horn relay
Consult the relay identification diagram on the underside of the PDC cover you just removed. The horn relay is typically labeled 'HORN' and is a mini ISO relay. Note the relay position and orientation before removal. The relay will have a specific pin configuration and may be color-coded. Note: Verify correct Mopar horn relay part number against factory service documentation for the 2005 Viper, or use an equivalent mini ISO relay matching the original.
5
Remove the horn relay
Grip the horn relay firmly and pull straight upward with steady pressure to extract it from its socket. If the relay is difficult to remove, use needle-nose pliers to grip the relay body (not the terminals) and pull straight up. Avoid rocking the relay side-to-side as this can damage the socket terminals.
6
Inspect relay socket and terminals
Examine the relay socket terminals for corrosion, discoloration, or damage. Check for bent or pushed-back pins. If corrosion is present, spray electrical contact cleaner into the socket and allow to dry completely. Inspect the removed relay for signs of overheating (melted plastic, discolored terminals) or physical damage.
7
Install new horn relay
Align the new horn relay with the socket, ensuring the orientation matches the diagram on the PDC cover and the original relay position. The relay will only fit one way due to pin configuration. Press the relay firmly and straight down into the socket until it is fully seated and flush with surrounding relays. You should feel or hear a positive engagement.
8
Reinstall PDC cover
Position the PDC cover over the fuse box, aligning the cover tabs with the corresponding slots on the PDC housing. Press down firmly on all edges until you hear the retaining tabs click into place. If fasteners were present during removal, reinstall them now.
9
Reconnect battery negative terminal
Return to the rear cargo area and reconnect the negative battery cable to the negative terminal. Tighten the terminal bolt to specification using a 10mm wrench. Ensure the connection is secure but do not overtighten.
Torque spec
Battery Terminal Bolts6 Nm (4 lb-ft)