OBD Guide
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B1C84

Heated Rear Window Relay Output

B1C84 is an OBD-II diagnostic trouble code meaning: Heated Rear Window Relay Output. Common causes: faulty heating relay, open or short circuit in wiring harness. Estimated repair cost: $22–56.

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

Symptoms

  • Heated rear window does not work
  • Heating indicator does not light up
  • Error on the dashboard

Causes

  • Faulty heating relay
  • Open or short circuit in wiring harness
  • Blown fuse
  • Problems in the control unit

How to Fix

  1. Check the heating circuit fuse
  2. Check the integrity of the wiring harness
  3. Check the operation of the heating relay
  4. If necessary, replace the relay or fuse
  5. Check the control unit for errors

Related codes

B1C85B1C86

FAQ

What does the B1C84 code mean?

B1C84 is an OBD-II diagnostic trouble code that indicates: Heated Rear Window Relay Output

What causes a B1C84 error code?

The most common causes of B1C84 include: Faulty heating relay; Open or short circuit in wiring harness; Blown fuse; Problems in the control unit.

How do I fix a B1C84 diagnostic trouble code?

To fix B1C84: Check the heating circuit fuse. Check the integrity of the wiring harness. Check the operation of the heating relay. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1C84?

Limited driving only, diagnose soon

How much does it cost to fix B1C84?

The estimated repair cost for B1C84 is $22–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat