B1871 Passenger Air Bag Deactivation Switch Fault

• OBD2 Code: B1871
• Description: Passenger air bag deactivation switch fault.
• Definition: This code indicates a malfunction in the passenger airbag deactivation switch circuit, which may involve issues such as an open or shorted circuit, faulty switch, or poor electrical connection.

B1871 – Passenger Air Bag Deactivation Switch Fault
Typical Severity: Moderate

Common Causes

b1871 – Passenger Air Bag Deactivation Switch Fault

Common Causes:

• Faulty passenger air bag deactivation switch
• Wiring issues in the circuit connected to the passenger air bag deactivation switch
• Defective air bag control module
• Corrosion or poor connection in the electrical system related to the passenger air bag deactivation switch

Common Misdiagnosis

OBD2 Code: B1871

Description: Passenger Air Bag Deactivation Switch Fault

Common Misdiagnosis: Replacing the airbag module or control unit without checking the deactivation switch wiring and connections.

Common Diagnostic Steps

OBD2 Code: B1871
Description: Passenger Air Bag Deactivation Switch Fault

• Inspect the passenger airbag deactivation switch for physical damage or wear.
• Check the wiring and connectors associated with the deactivation switch for any signs of corrosion, damage, or disconnection.
• Use a multimeter to test the continuity and resistance of the switch circuit.
• Verify that there is proper voltage supply to the switch using a voltmeter.
• Scan for additional trouble codes that may indicate related issues in the airbag system.
• If available, use a diagnostic scanner to perform an active test on the passenger airbag system to ensure proper functionality.
• Consult vehicle-specific repair manuals or technical service bulletins (TSBs) for any known issues related to this code.