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B1C18 Chrysler Code - Passenger Active Headrest Control Circuit Low

Quick Answer

The B1C18 Chrysler code refers to an issue with the Passenger Active Headrest Control Circuit being detected as low. Common causes include Faulty wiring or connectors in the active headrest control circuit, Malfunctioning control module that processes signals from the sensors, Defective sensors that detect rear-end collisions. 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
B1C18 Chrysler indicates Passenger Active Headrest Control Circuit Low.
Common causes
Common causes include Faulty wiring or connectors in the active headrest control circuit, Malfunctioning control module that processes signals from the sensors, Defective sensors that detect rear-end collisions.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code B1C18 Chrysler Description

The B1C18 Chrysler code refers to an issue with the Passenger Active Headrest Control Circuit being detected as low. In vehicles equipped with active headrests, the system is designed to automatically move the headrest forward in the event of a rear-end collision to reduce the risk of whiplash injuries. When this code is triggered, it indicates that there is a malfunction in the circuit that controls this feature.

OBDII Code B1C18 Chrysler - Passenger Active Headrest Control Circuit Low
B1C18 Chrysler Code - Passenger Active Headrest Control Circuit Low

Common Causes of B1C18 Chrysler

  1. Faulty wiring or connectors in the active headrest control circuit
  2. Malfunctioning control module that processes signals from the sensors
  3. Defective sensors that detect rear-end collisions
  4. Issues with the motor that moves the headrest
  5. Electrical problems in the vehicle affecting the circuit

Symptoms of B1C18 Chrysler

  1. Malfunction indicator light (MIL) or airbag light illuminated on the dashboard
  2. Inability to adjust the position of the active headrest
  3. Active headrest not deploying in a rear-end collision
  4. Unusual noises coming from the headrest assembly

How to Fix B1C18 Chrysler

  1. Begin by diagnosing the specific cause of the low circuit voltage, using a diagnostic scanner to retrieve the fault codes and pinpoint the issue.
  2. Inspect the wiring and connectors in the active headrest control circuit for any signs of damage or corrosion. Repair or replace any faulty components as needed.
  3. Test the sensors and control module for proper functionality. Replace any defective parts.
  4. Check the motor that moves the headrest for proper operation. Repair or replace as necessary.
  5. Clear the fault codes and test the system to ensure that the issue has been resolved.

Cost to Fix B1C18 Chrysler

The cost of repairing the Passenger Active Headrest Control Circuit Low issue can vary depending on the specific cause of the problem and the extent of the repairs needed. On average, the parts for this repair can range from $100 to $300, while labor costs can add another $100 to $200 to the total bill. Keep in mind that these are rough estimates, and actual costs may differ based on the location, vehicle make and model, and the shop's labor rates. It's recommended to consult with a professional technician for a more accurate cost estimate.

When is the Code Detected?

This code will set, if the Occupant Restraint Controller (ORC) detects low voltage on the Active Head Restraint 1st Row Passenger Signal circuit.

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Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

  • Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
  • Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
  • Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
  • Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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 B1C18 Chrysler Code

1. What does the OBDII code B1C18 mean on a Chrysler?

B1C18 indicates a problem with the Passenger Active Headrest Control Circuit, specifically a low voltage condition.

2. What are the common symptoms of the B1C18 code?

Common symptoms include a malfunctioning or unresponsive passenger-side active headrest, airbag warning lights, and possibly a stored fault code in the vehicle’s computer.

3. What causes the B1C18 code to appear?

The most common causes are damaged wiring, a faulty Active Headrest Control Module, connector issues, or a short circuit in the control circuit.

4. Is it safe to drive with the B1C18 code active?

While the car may still be drivable, the active headrest may not deploy correctly in the event of a collision, which could compromise passenger safety.

5. How do I diagnose the B1C18 code?

Start by visually inspecting the wiring and connectors for damage or corrosion, and use a multimeter to check for correct voltage in the control circuit.

6. Can a faulty Passenger Active Headrest Control Module cause the B1C18 code?

Yes, a malfunctioning module can cause the circuit to register low voltage, triggering the code.

7. How do I fix the B1C18 code on a Chrysler?

Repairs may include replacing damaged wiring, cleaning or reconnecting faulty connectors, or replacing the Passenger Active Headrest Control Module if it is defective.

8. How much does it cost to fix the B1C18 code?

The repair cost varies depending on the issue, but wiring repairs typically cost less, while replacing the control module could range from $200 to $600, including parts and labor.

9. Can a weak car battery trigger the B1C18 code?

A weak or failing car battery may contribute to low voltage issues, but it is not a common cause for this specific code.

10. Do I need a professional to clear the B1C18 code?

While clearing the code requires an OBDII scanner, it’s important to first resolve the underlying issue to prevent the code from returning. Professional help may be needed if the problem is complex.

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