OBD Guide
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B1985

Seat Switch Lumbar Deflate Circuit Failure

B1985 is an OBD-II diagnostic trouble code meaning: Seat Switch Lumbar Deflate Circuit Failure. Common causes: open or short circuit in wiring harness, solenoid valve malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Seat lumbar support does not deflate
  • Lumbar support cannot be adjusted
  • The SRS/airbag malfunction indicator comes on

Causes

  • Open or short circuit in wiring harness
  • Solenoid valve malfunction
  • Mechanical damage to the lumbar support cushion
  • Problems with the seat control unit
  • Corrosion of contacts or connectors

How to Fix

  1. Check the integrity of the wiring harness in the lumbar support deflation circuit section
  2. Inspect connectors and contacts for corrosion or damage
  3. Check squib/solenoid valve resistance
  4. Replace damaged components if necessary
  5. Reset the error code and check the system operation

Related codes

B1980B1982B1984

FAQ

What does the B1985 code mean?

B1985 is an OBD-II diagnostic trouble code that indicates: Seat Switch Lumbar Deflate Circuit Failure

What causes a B1985 error code?

The most common causes of B1985 include: Open or short circuit in wiring harness; Solenoid valve malfunction; Mechanical damage to the lumbar support cushion; Problems with the seat control unit.

How do I fix a B1985 diagnostic trouble code?

To fix B1985: Check the integrity of the wiring harness in the lumbar support deflation circuit section. Inspect connectors and contacts for corrosion or damage. Check squib/solenoid valve resistance. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1985?

Yes, but get it checked soon

How much does it cost to fix B1985?

The estimated repair cost for B1985 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat