OBD Guide
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B19F9

Left Rear Window Switch Circuit Stuck

B19F9 is an OBD-II diagnostic trouble code meaning: Left Rear Window Switch Circuit Stuck. Common causes: the mechanical part of the switch is stuck, short circuit in wiring harness. Estimated repair cost: $22–56.

Severity
✅ Low
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–56 (est.)

Symptoms

  • Left rear window doesn't work
  • The glass lowers/raises spontaneously
  • Glass control button stuck

Causes

  • The mechanical part of the switch is stuck
  • Short circuit in wiring harness
  • Switch fault
  • Problems with contacts in connectors
  • Body control module malfunction (rare)

How to Fix

  1. Check the mechanical part of the switch for jamming
  2. Inspect the wiring harness for damage
  3. Test the switch circuit with a multimeter
  4. Replace the switch if necessary
  5. Reset the error with an OBD-II scanner after repair

Related codes

B19F8B19FAB19FB

FAQ

What does the B19F9 code mean?

B19F9 is an OBD-II diagnostic trouble code that indicates: Left Rear Window Switch Circuit Stuck

What causes a B19F9 error code?

The most common causes of B19F9 include: The mechanical part of the switch is stuck; Short circuit in wiring harness; Switch fault; Problems with contacts in connectors.

How do I fix a B19F9 diagnostic trouble code?

To fix B19F9: Check the mechanical part of the switch for jamming. Inspect the wiring harness for damage. Test the switch circuit with a multimeter. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B19F9?

Limited driving only, diagnose soon

How much does it cost to fix B19F9?

The estimated repair cost for B19F9 is $22–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat