B1875 – Turn Signal / Hazard Switch Signal Circuit Failure

The ODBII code B1875 indicates a malfunction in the turn signal or hazard switch signal circuit, suggesting a failure in the communication or functionality of the switch.

The severity of ODBII code B1875 is moderate.

Common Causes For: B1874 Cellular Phone Handset Not Present

• Faulty turn signal switch
• Damaged wiring or connectors
• Short circuit in the signal circuit
• Corroded terminals
• Faulty body control module (BCM)
• Poor ground connection
• Malfunctioning hazard switch

Common misdiagnosis for B1875 Turn Signal / Hazard Switch Signal Circuit Failure

• Faulty turn signal relay
• Malfunctioning body control module (BCM)
• Wiring issues or shorts in the circuit
• Defective turn signal bulbs
• Problems with the steering column switch
• Issues with the fuse related to the turn signal system
• Faulty hazard switch
• Incorrectly diagnosed as a problem with the headlights or taillights

Common Troubleshooting Steps

When dealing with OBD-II code B1875, which indicates a Turn Signal / Hazard Switch Signal Circuit Failure, there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Check for Additional Codes: Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are multiple issues.
• Inspect the Turn Signal and Hazard Switch: **Visual Inspection: Check the turn signal and hazard switch for any visible damage, corrosion, or loose connections.
• **Functionality Test: Test the switch to ensure it operates correctly. You can do this by activating the turn signals and hazards to see if they function as expected.
• Examine Wiring and Connectors: **Wiring Inspection: Look for damaged, frayed, or shorted wires in the circuit leading to the turn signal and hazard switch.
• **Connector Check: Ensure that all connectors are secure and free of corrosion. Clean any corroded connectors and ensure a tight fit.
• Test the Circuit: **Voltage and Ground Testing: Use a multimeter to check for proper voltage and ground at the turn signal switch. Ensure that the switch is receiving power and that the ground is intact.
• **Continuity Test: Perform a continuity test on the wiring to ensure there are no breaks in the circuit.
• Inspect Related Components: **Body Control Module (BCM): The BCM may be involved in processing the signals from the turn signal switch. Check for any faults or issues with the BCM.
• **Fuses: Check the relevant fuses associated with the turn signal and hazard lights. Replace any blown fuses.
• Check for Short Circuits: Inspect the circuit for any potential short circuits that could be causing the failure. This may involve checking for pinched wires or connections that may be touching the vehicle chassis.
• Perform a Reset: After addressing any issues found, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Consult Wiring Diagrams: If the issue persists, consult the vehicle’s wiring diagrams to trace the circuit and identify any other components that may be involved.
• Seek Professional Help: If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic or technician who has experience with automotive electrical systems.Conclusion By following these troubleshooting steps, you should be able to identify the cause of the B1875 code and take appropriate action to resolve the issue. Always ensure safety precautions are taken when working with electrical systems in vehicles.