B1804
Lamp Turn Signal Rear Output Circuit Short To Battery
B1804 is an OBD-II diagnostic trouble code meaning: Lamp Turn Signal Rear Output Circuit Short To Battery. Common causes: damage to wire insulation, short circuit in wiring harness. Estimated repair cost: $6–56.
Symptoms
- Rear turn signals do not work
- Flashing of indicators at an abnormal frequency
- The fault light on the instrument panel is on
Causes
- Damage to wire insulation
- Short circuit in wiring harness
- Turn signal relay malfunction
- Corrosion of contacts in the rear light
- Problems with the control unit
How to Fix
- Conduct a visual inspection of the wires and harness in the rear light area
- Check the continuity of the circuit with a multimeter
- Replace damaged wires or electrical tape
- Clean the contacts in the rear light
- Check and, if necessary, replace the turn signal relay
- Flash or replace the control unit if necessary
Related codes
FAQ
What does the B1804 code mean?
B1804 is an OBD-II diagnostic trouble code that indicates: Lamp Turn Signal Rear Output Circuit Short To Battery
What causes a B1804 error code?
The most common causes of B1804 include: Damage to wire insulation; Short circuit in wiring harness; Turn signal relay malfunction; Corrosion of contacts in the rear light.
How do I fix a B1804 diagnostic trouble code?
To fix B1804: Conduct a visual inspection of the wires and harness in the rear light area. Check the continuity of the circuit with a multimeter. Replace damaged wires or electrical tape. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B1804?
Do not drive — repair immediately
How much does it cost to fix B1804?
The estimated repair cost for B1804 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
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