B392B

Seat Lumbar/Bolster Pump

Severity

✅ Low

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–167 (est.)

Symptoms

Lumbar support adjustment does not work
The side bolsters of the seat do not inflate
I hear a humming sound from the pump when trying to adjust
Error message on display

Causes

Open circuit or short circuit in the wiring harness
Pump motor malfunction
Problems with the seat control module
Oxidation of contacts
Mechanical damage to air tubes

How to Fix

Check circuit fuse
Inspect the wiring harness under the seat for damage.
Check the voltage at the pump
Test the operation of the pump directly from the battery
If necessary, replace the pump or control unit

Related codes

B392A B392C B3930