B1304
Accessory Delay Relay Coil Circuit Short To Battery
B1304 is an OBD-II diagnostic trouble code meaning: Accessory Delay Relay Coil Circuit Short To Battery. Common causes: short circuit of the relay control wire to the positive wire, internal short circuit in delay relay. Estimated repair cost: $33–167.
Symptoms
- Accessories always on after turning off the ignition
- Low battery while parked
- Accessory delay functions not working
Causes
- Short circuit of the relay control wire to the positive wire
- Internal short circuit in delay relay
- Body Control Module (BCM) malfunction
- Wiring harness damage
- Corrosion or moisture in contacts
How to Fix
- Check the condition of the accessory delay relay, replace if necessary
- Visually inspect the wiring harness for damage and short circuits.
- Check the integrity of the relay control circuit using a multimeter
- Check contacts and connectors for corrosion
- If there are no wiring problems, diagnose the BCM
Related codes
FAQ
What does the B1304 code mean?
B1304 is an OBD-II diagnostic trouble code that indicates: Accessory Delay Relay Coil Circuit Short To Battery
What causes a B1304 error code?
The most common causes of B1304 include: Short circuit of the relay control wire to the positive wire; Internal short circuit in delay relay; Body Control Module (BCM) malfunction; Wiring harness damage.
How do I fix a B1304 diagnostic trouble code?
To fix B1304: Check the condition of the accessory delay relay, replace if necessary. Visually inspect the wiring harness for damage and short circuits.. Check the integrity of the relay control circuit using a multimeter. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B1304?
Limited driving only, diagnose soon
How much does it cost to fix B1304?
The estimated repair cost for B1304 is $33–167. Actual cost depends on your vehicle, location, and labor rates.
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