B1885 – Seatbelt Driver Pretensioner Circuit Resistance Low on Squib

The ODBII code B1885 indicates a low resistance in the driver seatbelt pretensioner circuit, which may suggest a fault in the pretensioner itself or its wiring, potentially affecting the airbag system’s functionality.

The severity of ODBII code B1885 is typically considered moderate to high.

Common Causes For: B1884 PAD Warning Lamp Inoperative

• Faulty driver seatbelt pretensioner
• Damaged wiring or connectors in the pretensioner circuit
• Short circuit in the pretensioner circuit
• Corroded or loose connections
• Faulty airbag control module
• Open circuit in the pretensioner wiring
• Incorrectly installed or aftermarket seatbelt components

Common misdiagnosis for B1885 Seatbelt Driver Pretensioner Circuit Resistance Low on Squib

• Faulty seatbelt pretensioner
• Damaged wiring or connectors
• Faulty airbag control module
• Incorrectly installed or malfunctioning seatbelt assembly
• Short circuit in the seatbelt system
• Faulty seat occupancy sensor
• Issues with the vehicle’s body control module (BCM)

Common Troubleshooting Steps

The OBD-II code B1885 indicates a problem with the driver’s seatbelt pretensioner circuit, specifically that the resistance is low, which may suggest a fault in the squib (the igniter for the pretensioner). Here are some common troubleshooting steps to diagnose and resolve this issue:

• Visual Inspection: **Check Wiring and Connectors: Inspect the wiring harness and connectors related to the seatbelt pretensioner for any signs of damage, corrosion, or loose connections.
• **Look for Physical Damage: Check the seatbelt assembly and pretensioner for any physical damage or signs of deployment.
• Disconnect Battery: **Safety First: Before working on airbag systems, disconnect the negative battery terminal to prevent accidental deployment of the airbag or pretensioner.
• Check Resistance: **Measure Resistance: Use a multimeter to measure the resistance of the pretensioner squib. Compare the reading to the manufacturer’s specifications. A low resistance reading may indicate a short circuit or a fault in the squib.
• **Inspect the Pretensioner: If the resistance is out of spec, the pretensioner may need to be replaced.
• Check for Short Circuits: **Inspect for Shorts: Check the wiring for any shorts to ground or to other circuits. This can cause low resistance readings.
• **Continuity Testing: Perform continuity tests on the wiring to ensure there are no breaks or shorts.
• Scan Tool Diagnosis: **Use a Diagnostic Scanner: Connect an OBD-II scanner to check for any additional codes that may provide more context to the issue.
• **Clear Codes: After performing checks and repairs, clear the codes and see if the B1885 code returns.
• Check the Airbag Module: **Inspect the Airbag Control Module: If all wiring and components appear to be in good condition, the issue may lie within the airbag control module itself. Check for any faults or updates that may be needed.
• Replace Components if Necessary: **Replace the Pretensioner: If the pretensioner is found to be faulty, replace it with a new one. Ensure that the replacement part is compatible with your vehicle.
• **Reconnect Everything: After repairs, reconnect all connectors and wiring, ensuring they are secure.
• Recheck System: **Reconnect Battery: Reconnect the negative battery terminal and perform a final check.
• **Test the System: Start the vehicle and check if the warning light is still illuminated. If the code does not return, the issue is resolved.
• Consult Service Manual: **Refer to Manufacturer’s Service Manual: If the problem persists, consult the vehicle’s service manual for specific troubleshooting steps and specifications related to the seatbelt pretensioner system.
• Professional Help: **Seek Professional Assistance: If you are unable to resolve the issue, consider taking the vehicle to a qualified technician or dealership for further diagnosis.Important Note: Always handle airbag and pretensioner systems with care, as they are safety-critical components. If you are not comfortable performing these checks, it is advisable to seek professional help.