Chrysler 300 Relay Guide for 2005-2012 Models
Having electrical issues? This guide will help you understand, diagnose, and replace the relays in your Chrysler 300.
- A failing relay can mimic a more serious component failure; always check the relay first.
- The most common failure is the fuel pump relay, leading to a 'crank, no start' condition.
- Plug-in relays are extremely easy to replace yourself, requiring no tools.
- Be aware of the TIPM; some relays are soldered to the board and are not simple plug-and-play replacements.
Common Symptoms of a Failing Relay
A bad relay can cause a variety of problems, often making you think a more expensive part has failed. Because relays control different systems, the symptoms will depend on which relay has gone bad. Here are the most common signs:
- Engine Cranks but Won't Start: This is the most common symptom of a bad fuel pump relay. 🎬 Watch: Troubleshooting a Chrysler 300 that cranks but won't start. The starter turns the engine, but since the fuel pump isn't getting power, the engine doesn't get fuel and won't start.
- Engine Overheating: If the cooling fan relay fails, the radiator fan won't turn on when the engine gets hot. This usually causes overheating when you're stopped or driving at low speeds. 🎬 See how to locate and replace the radiator fan relay.
- Accessory Failure: If your horn, wipers, or power windows suddenly stop working, the relay that controls that specific circuit may be the culprit.
- Battery Drain: In some cases, a relay can get stuck in the "on" position. If this happens to the fuel pump relay, for example, the pump may continue to run even after you turn the car off, draining your battery.
A Note on the TIPM
The 2005-2012 Chrysler 300 uses a Totally Integrated Power Module (TIPM), which is the main fuse and relay box under the hood. Many relays are simple, plug-in units that are easy to replace. However, some critical relays, like the fuel pump relay, can be soldered directly to the TIPM's internal circuit board. If an integrated relay fails, fixing it is more complex than just swapping a part. Chrysler issued recalls for some models related to this issue, providing an external relay kit as a fix. 🎬 Watch this guide on performing a TIPM fuel pump relay bypass. Always check if your specific issue is with a plug-in relay or an integrated one.
Choosing an Aftermarket Relay
For a simple, plug-in component like a relay, a new aftermarket part offers excellent value. OEM (Original Equipment Manufacturer) relays from Mopar can be more expensive, but they don't necessarily perform better than a quality aftermarket alternative for this type of part. A standard "Replacement" brand relay is built to meet or exceed the original specifications and is a cost-effective way to fix your electrical issues. The most important thing is to match the pin configuration and specifications to the original relay you are replacing.
Estimated Costs
| Part Type | Estimated Cost |
|---|---|
| New OEM (Mopar) | $15 - $40 |
| New Aftermarket | $17.03 |
| Used OEM | $10 - $25 |
| Shop Labor | $37 - $54 |
Frequently Asked Questions
Where are the relays located on my 2005-2012 Chrysler 300?
Your Chrysler 300 has two main fuse/relay boxes. The primary one, called the Totally Integrated Power Module (TIPM), is in the engine bay on the passenger side. The second one is in the trunk, near the battery under the spare tire cover. The cover of each box usually has a diagram showing the location and function of each relay.
Can I replace a relay myself?
Yes, replacing a plug-in relay is one of the easiest repairs you can do. It requires no special tools. You simply locate the faulty relay in the fuse box, pull it straight out, and push the new one in. It's a good idea to disconnect the battery's negative terminal before starting.
How do I test a relay to see if it's bad?
A simple diagnostic trick is to swap the suspect relay with an identical relay from a non-essential system (like the horn). If swapping the relays makes the horn stop working and fixes your original problem, you've confirmed the relay is bad. You can also test a relay with a multimeter and a 9V or 12V battery.
Is there a recall for relays on the Chrysler 300?
While not specific to the 300 in all cases, Chrysler did issue recalls for other vehicles of the same era (like the Dodge Durango and Jeep Grand Cherokee) for failing fuel pump relays integrated into the TIPM. The fix involved installing an external relay. If you are experiencing a no-start condition, it is worth checking with a dealer or on the NHTSA website to see if any recalls apply to your vehicle's VIN.
Helpful Videos
Technical Specifications
OEM Part Numbers: 4727370AA 5269988AA 56007078 4671886AA
Standard ISO Mini Relay, 5-pin configuration. Amperage and voltage ratings must match OEM specifications for the specific circuit.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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