AutoCodes – Generic – B1C99

B1C99 Code - Right Corner Lamp Circuit Circuit Short

Quick Answer

The Steering Column Control Module (SCCM) monitors the multifunction switch position. Common causes include Faulty Right Corner Lamp, Right Corner Lamp harness is open or shorted, Right Corner Lamp 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: B1C99 indicates Right Corner Lamp Circuit Circuit Short.
Common causes: Common causes include Faulty Right Corner Lamp, Right Corner Lamp harness is open or shorted, Right Corner Lamp 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 3,571

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 B1C99 Description

The Steering Column Control Module (SCCM) monitors the multifunction switch position. When the multifunction switch is in the left or right TURN position, the SCCM sends a turn signal switch_status message over the communication network to the Body Control Module (BCM) indicating a request for the left or right turn signal. When the BCM receives a request for a turn signal, the BCM supplies on/off voltage to the appropriate turn lamps.
The timed on/off cycle for turn lamps is determined by the BCM and is set to flash approximately 80 times per minute if both the front and rear turn signal lamps operate correctly. If an individual turn signal lamp is inoperative, the BCM fast flashes the remaining turn lamp approximately 160 times per minute to indicate a bulb outage to the driver. The OBDII sets when the BCM detects the front, rear or exterior mirror turn lamp output is not to factory specifications.

OBDII Code B1C99 - Right Corner Lamp Circuit Circuit Short - AutoCodes.com — B1C99 Code - Right Corner Lamp Circuit Circuit Short

What does this mean?

What are the Possible Causes of the DTC B1C99?

Faulty Right Corner Lamp
Right Corner Lamp harness is open or shorted
Right Corner Lamp circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B1C99?

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

B1C99:11 Right Corner Lamp Circuit Circuit Short To Ground
B1C99:15 Right Corner Lamp Circuit Circuit Short To Battery or Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1C99 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 B1C99 code?

Need more information on how to fix the B1C99 code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

B1C99 Ford — Right Corner Lamp Circuit Circuit Short
B1C99 Lincoln — Right Corner Lamp Circuit Circuit Short
B1C99 Mercury — Right Corner Lamp Circuit Circuit Short

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 B1C99 Code

1. What are common symptoms of OBDII code B1C99 (Right Corner Lamp Circuit Short)?

- Common symptoms include the right corner lamp not working, flashing rapidly, or staying on constantly.

2. What are the possible causes of OBDII code B1C99?

- The code B1C99 can be triggered by a short circuit in the right corner lamp wiring, a faulty bulb, or a problem with the lamp socket.

3. How do I diagnose the source of the right corner lamp circuit short?

- To diagnose the issue, you can start by visually inspecting the wiring, checking the bulb for any signs of damage, and testing the lamp socket for proper connection.

4. Can a blown fuse cause OBDII code B1C99 to appear?

- Yes, a blown fuse in the right corner lamp circuit can also trigger the B1C99 code. Checking and replacing the fuse may resolve the issue.

5. What are the repair options for addressing OBDII code B1C99?

- Repair options include fixing any damaged wiring, replacing a faulty bulb or socket, and ensuring proper grounding of the right corner lamp.

6. Is it safe to continue driving with OBDII code B1C99 active?

- It is generally safe to drive with the B1C99 code, but it is recommended to address the issue promptly to ensure proper functioning of the right corner lamp.

7. Can moisture or water ingress cause OBDII code B1C99 to trigger?

- Yes, moisture or water ingress into the right corner lamp assembly can lead to a short circuit and trigger the B1C99 code.

8. Do I need specialized tools to fix OBDII code B1C99?

- Basic hand tools such as screwdrivers, pliers, and a multimeter for testing continuity can help diagnose and fix the right corner lamp circuit short.

9. Will resetting the OBDII system clear the B1C99 code?

- Resetting the OBDII system may temporarily clear the code, but it will likely reappear if the underlying issue with the right corner lamp circuit is not addressed.

10. Is it possible for a loose connection to cause OBDII code B1C99 to appear?

- Yes, a loose or poor connection in the right corner lamp circuit can cause intermittent shorts and trigger the B1C99 code.