AutoCodes – Generic – B1C84

B1C84 Code - Heated Rear Window Relay Output

Quick Answer

The Body Control Module (BCM) monitors the Heated Rear Window Relay Output. Common causes include Faulty Heated Rear Window Relay, Heated Rear Window Relay harness is open or shorted, Heated Rear Window Relay circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B1C84 indicates Heated Rear Window Relay Output.
Common causes: Common causes include Faulty Heated Rear Window Relay, Heated Rear Window Relay harness is open or shorted, Heated Rear Window Relay circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 2,311

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 26, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B1C84 Description

The Body Control Module (BCM) monitors the Heated Rear Window Relay Output. The BCM sets the OBDII code when the Heated Rear Window Relay Output is not to factory specifications.

OBDII Code B1C84 - Heated Rear Window Relay Output - AutoCodes.com — B1C84 Code - Heated Rear Window Relay Output

What does this mean?

What are the Possible Causes of the DTC B1C84?

Faulty Heated Rear Window Relay
Heated Rear Window Relay harness is open or shorted
Heated Rear Window Relay circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B1C84?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

B1C84:11 Heated Rear Window Relay Output Circuit Short to Ground
B1C84:12 Heated Rear Window Relay Output Circuit Short To Battery
B1C84:13 Heated Rear Window Relay Output Circuit Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1C84 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B1C84 code?

Need more information on how to fix the B1C84 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1C84 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1C84 Ford — Heated Rear Window Relay Output
B1C84 Lincoln — Heated Rear Window Relay Output
B1C84 Mercury — Heated Rear Window Relay Output

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1C84 Code

1. What are the common symptoms of OBDII code B1C84 (Heated Rear Window Relay Output)?

- Common symptoms include a non-functioning rear window defroster, an illuminated indicator on the dashboard, and potentially a blown fuse.

2. What are the possible causes of OBDII code B1C84?

- The code B1C84 can be triggered by a faulty heated rear window relay, a damaged wiring harness, or a malfunctioning rear window defroster switch.

3. How can I diagnose the issue related to OBDII code B1C84?

- Diagnosing the problem involves checking the relay, inspecting the wiring for any damage, and testing the rear window defroster switch for proper functionality.

4. Can a blown fuse cause OBDII code B1C84 to appear?

- Yes, a blown fuse related to the heated rear window system can trigger the B1C84 code. It's recommended to check and replace any blown fuses as a first step in troubleshooting.

5. What are the repair options for OBDII code B1C84?

- Repair options may include replacing the faulty relay, repairing the damaged wiring, or replacing the rear window defroster switch, depending on the root cause of the issue.

6. Is it safe to continue driving with OBDII code B1C84 active?

- It is generally safe to drive with this code, but it's important to address the issue promptly to ensure the proper functioning of the rear window defroster, especially in cold or rainy weather.

7. Can a DIY enthusiast fix OBDII code B1C84 at home?

- Depending on the root cause of the issue, some DIY enthusiasts with automotive repair experience may be able to address code B1C84 by replacing the relay, checking and repairing wiring, or replacing the switch.

8. How long does it typically take to repair OBDII code B1C84?

- The repair time for code B1C84 can vary based on the specific cause of the issue and the expertise of the individual performing the repair. It can range from a quick fuse replacement to a more involved relay replacement.

9. Should I reset the OBDII code B1C84 after completing repairs?

- Yes, it's recommended to reset the OBDII code B1C84 using an OBDII scanner after completing any repairs to ensure the system recognizes the issue has been addressed.

10. Are there any preventive maintenance steps to avoid OBDII code B1C84 in the future?

- Regularly inspecting the rear window defroster system, checking the fuse's condition, and addressing any issues promptly can help prevent the occurrence of OBDII code B1C84 in the future.