OBD Guide
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B1984

Seat Switch Lumbar Inflate Circuit Failure

B1984 is an OBD-II diagnostic trouble code meaning: Seat Switch Lumbar Inflate Circuit Failure. Common causes: open power or control circuit, solenoid valve malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • No lumbar support adjustment
  • Irregular operation of the lumbar element
  • Error message on the dashboard

Causes

  • Open power or control circuit
  • Solenoid valve malfunction
  • Mechanical damage to the inflatable element
  • Problems in the wiring harness
  • Malfunction of the airbag control unit

How to Fix

  1. Check the integrity of the wiring harness to the seat
  2. Test lumbar element resistance
  3. Check the operation of the solenoid valve
  4. Scan the airbag system for other errors
  5. Replace damaged components if necessary

Related codes

B1983B1985B1990

FAQ

What does the B1984 code mean?

B1984 is an OBD-II diagnostic trouble code that indicates: Seat Switch Lumbar Inflate Circuit Failure

What causes a B1984 error code?

The most common causes of B1984 include: Open power or control circuit; Solenoid valve malfunction; Mechanical damage to the inflatable element; Problems in the wiring harness.

How do I fix a B1984 diagnostic trouble code?

To fix B1984: Check the integrity of the wiring harness to the seat. Test lumbar element resistance. Check the operation of the solenoid valve. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1984?

Limited driving only, diagnose soon

How much does it cost to fix B1984?

The estimated repair cost for B1984 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat