B1C11

Symptoms

• The security warning light on the dashboard comes on
• No reaction from the active head restraint when trying to activate it
• Visible damage or wear to the headrest wiring harness
• Unstable system behavior (periodic operations or failures)
• Burning smell or signs of overheating in the headrest mounting area

Causes

• Broken or damaged headrest control wiring harness
• Corrosion or oxidation of control circuit connector contacts
• Malfunction of the headrest solenoid valve
• Defective headrest control module or safety system control unit
• Loose or broken power or ground connection
• Internal short circuit in control circuit
• Damage to the connector or contact socket

How to Fix

1. Connect the diagnostic scanner and fully read the memory codes to confirm B1C11
2. Visually inspect the headrest control wiring harness for damage, breaks or oxidation.
3. Check the cleanliness and reliability of the headrest control connector contacts
4. Measure the resistance of the power and ground circuit of the head restraint control solenoid
5. Measure the resistance of the solenoid valve itself (usually 20-50 Ohms depending on the model)
6. Check the supply voltage at the control connector when trying to activate the system
7. If necessary, replace the damaged wiring harness or restore the connector contacts
8. If the solenoid valve is faulty, replace the headrest assembly or the solenoid separately.
9. If the control module is faulty, replace it with a new one or repair it
10. Erase error codes and test system functionality

Related codes

FAQ