OBD Guide
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B1371

Illuminated Entry Relay Circuit Failure

B1371 is an OBD-II diagnostic trouble code meaning: Illuminated Entry Relay Circuit Failure. Common causes: faulty interior lighting relay, open or short circuit in wiring harness. Estimated repair cost: $11–56.

Severity
✅ Low
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$11–56 (est.)

Symptoms

  • Interior lighting does not work when doors are opened
  • Interior lamps do not work
  • Backlight flashing may be present

Causes

  • Faulty interior lighting relay
  • Open or short circuit in wiring harness
  • Circuit fuse problems
  • Lighting ECU malfunction

How to Fix

  1. Check the interior lighting fuse
  2. Check the interior lighting relay for malfunctions
  3. Inspect the wiring harness for damage
  4. Check the contacts and connectors of the circuit
  5. If necessary, replace the relay or repair the wiring harness

FAQ

What does the B1371 code mean?

B1371 is an OBD-II diagnostic trouble code that indicates: Illuminated Entry Relay Circuit Failure

What causes a B1371 error code?

The most common causes of B1371 include: Faulty interior lighting relay; Open or short circuit in wiring harness; Circuit fuse problems; Lighting ECU malfunction.

How do I fix a B1371 diagnostic trouble code?

To fix B1371: Check the interior lighting fuse. Check the interior lighting relay for malfunctions. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1371?

Yes, but get it checked soon

How much does it cost to fix B1371?

The estimated repair cost for B1371 is $11–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat