OBD Guide
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B14B4

Passenger Seat Heater Thermistor Circuit Short Circuit

B14B4 is an OBD-II diagnostic trouble code meaning: Passenger Seat Heater Thermistor Circuit Short Circuit. Common causes: open or short circuit in wiring harness, heated seat thermistor malfunction. Estimated repair cost: $33–111.

Severity
✅ Low
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$33–111 (est.)

Symptoms

  • Heated passenger seat does not work
  • Seat heating indicator flashes
  • Diagnostic system memory error

Causes

  • Open or short circuit in wiring harness
  • Heated seat thermistor malfunction
  • Corrosion or poor contact in connectors
  • Damage to the comfort system control unit

How to Fix

  1. Check the integrity of the wiring harness to the thermistor
  2. Measure the resistance of the thermistor (should change when heated)
  3. Clean the connector contacts
  4. If necessary, replace the thermistor or control unit

Related codes

B14B3B14B5

FAQ

What does the B14B4 code mean?

B14B4 is an OBD-II diagnostic trouble code that indicates: Passenger Seat Heater Thermistor Circuit Short Circuit

What causes a B14B4 error code?

The most common causes of B14B4 include: Open or short circuit in wiring harness; Heated seat thermistor malfunction; Corrosion or poor contact in connectors; Damage to the comfort system control unit.

How do I fix a B14B4 diagnostic trouble code?

To fix B14B4: Check the integrity of the wiring harness to the thermistor. Measure the resistance of the thermistor (should change when heated). Clean the connector contacts. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B14B4?

Yes, but get it checked soon

How much does it cost to fix B14B4?

The estimated repair cost for B14B4 is $33–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat