B1315 Battery Saver Relay Coil Circuit Short To Battery

How to Fix B1315 Battery Saver Relay Coil Circuit Short to Battery


If you’re experiencing a B1315 Battery Saver Relay Coil Circuit Short to Battery error code, you’re not alone. This is a common issue that many car owners face, and it can be frustrating to deal with. However, with the right tools and knowledge, you can fix this problem yourself and save money on costly repairs. In this article, we’ll provide you with step-by-step instructions on how to fix the B1315 error code.

What is the B1315 Error Code?

The B1315 error code is a diagnostic trouble code (DTC) that indicates a problem with the battery saver relay coil circuit. This circuit is responsible for controlling the power to various electrical components in your car, such as the headlights, radio, and power windows. When this circuit is shorted to the battery, it can cause these components to malfunction or not work at all.

Tools You’ll Need

Before you start fixing the B1315 error code, you’ll need to gather a few tools. Here’s what you’ll need:

  • Socket set
  • Multimeter
  • Wire strippers
  • Electrical tape
  • Soldering iron
  • Heat shrink tubing

Step-by-Step Guide to Fixing the B1315 Error Code

Now that you have your tools ready, let’s get started on fixing the B1315 error code.

car vertical

Step 1: Disconnect the Battery

The first step is to disconnect the battery to prevent any electrical shocks or damage to your car’s electrical system. Use your socket set to remove the negative cable from the battery.

Step 2: Locate the Battery Saver Relay

The battery saver relay is usually located in the fuse box under the hood of your car. Consult your car’s manual to find the exact location.

Step 3: Test the Relay

Use your multimeter to test the battery saver relay. Set your multimeter to the ohms setting and touch the probes to the relay’s terminals. If the multimeter reads zero ohms, the relay is shorted and needs to be replaced.

Step 4: Replace the Relay

If the relay is shorted, use your socket set to remove it from the fuse box. Replace it with a new relay and tighten the bolts.

Step 5: Check the Wiring

Check the wiring for any damage or wear. Use your wire strippers to remove any damaged sections of wire and replace them with new wire. Use electrical tape to secure the connections.

Step 6: Solder the Connections

Use your soldering iron to solder the connections between the wires. This will ensure a strong and secure connection.

Step 7: Cover the Connections

Use heat shrink tubing to cover the connections and protect them from moisture and other elements.

Step 8: Reconnect the Battery

Reconnect the negative cable to the battery and tighten the bolt.


Fixing the B1315 error code may seem daunting, but with the right tools and knowledge, it can be done easily and quickly. By following these step-by-step instructions, you can save money on costly repairs and get your car back on the road in no time.


1. Can I drive my car with the B1315 error code?

It’s not recommended to drive your car with the B1315 error code. This error code can cause various electrical components in your car to malfunction or not work at all, which can be dangerous while driving.

2. How much does it cost to fix the B1315 error code?

The cost to fix the B1315 error code can vary depending on the make and model of your car and the extent of the damage. However, fixing it yourself can save you money on costly repairs.

3. How often should I check my car’s electrical system?

It’s recommended to check your car’s electrical system at least once a year to ensure everything is working properly. Regular maintenance can prevent costly repairs and keep your car running smoothly.