B1986: Driver’s Seat Seatback Autoglide Rearward Switch Circuit Failure

Definition

The OBD2 code B1986 indicates a failure in the circuit for the driver's seat seatback autoglide rearward switch, which may affect the functionality of the seat adjustment mechanism

Common causes

Faulty seatback autoglide switch
Damaged wiring or connectors
Short circuit in the circuit
Open circuit in the circuit
Malfunctioning seat control module
Corrosion or poor connections in the circuit
Faulty motor or actuator for the seatback adjustment

Common misdiagnoses

Faulty seat position sensor
Malfunctioning seat control module
Wiring issues or shorts in the seat harness
Defective seat motor
Problems with the vehicle's body control module (BCM)
Incorrectly diagnosed power supply issues
Misinterpretation of related codes or symptoms

Troubleshooting steps

1. Check the Vehicle's Manual

Refer to the vehicle's service manual for specific information related to the B1986 code, including wiring diagrams and component locations
2. Visual Inspection
3. Inspect the driver's seat and the seatback autoglide mechanism for any visible damage or disconnections
4. Check the wiring harness and connectors for signs of wear, corrosion, or loose connections
5. Test the Switch
6. Use a multimeter to test the driver's seat seatback autoglide rearward switch for continuity. If the switch is faulty, it may need to be replaced
7. Inspect the Wiring
8. Follow the wiring from the switch to the seat control module. Look for any frayed wires, shorts, or breaks in the circuit
9. Repair or replace any damaged wiring as necessary
10. Check the Seat Control Module
11. If the switch and wiring are in good condition, the issue may lie with the seat control module. Check for any fault codes stored in the module using a diagnostic scanner
12. If the module is faulty, it may need to be reprogrammed or replaced
13. Clear Codes and Test Drive
14. After performing repairs, clear the trouble codes using a diagnostic scanner
15. Take the vehicle for a test drive to see if the code reappears
16. Check for Related Codes
17. Sometimes, other related codes may provide additional insight into the issue. Check for any other DTCs that may be present
18. Consult a Professional
19. If the problem persists after performing these steps, it may be best to consult a professional mechanic or technician who has experience with automotive electrical systems. By following these steps, you should be able to diagnose and potentially resolve the issue related to the B1986 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check the Vehicle's Manual

2. Visual Inspection

3. Inspect the driver's seat and the seatback autoglide mechanism for any visible damage or disconnections

4. Check the wiring harness and connectors for signs of wear, corrosion, or loose connections

5. Test the Switch

6. Use a multimeter to test the driver's seat seatback autoglide rearward switch for continuity. If the switch is faulty, it may need to be replaced

7. Inspect the Wiring

8. Follow the wiring from the switch to the seat control module. Look for any frayed wires, shorts, or breaks in the circuit

9. Repair or replace any damaged wiring as necessary

10. Check the Seat Control Module

11. If the switch and wiring are in good condition, the issue may lie with the seat control module. Check for any fault codes stored in the module using a diagnostic scanner

12. If the module is faulty, it may need to be reprogrammed or replaced

13. Clear Codes and Test Drive

14. After performing repairs, clear the trouble codes using a diagnostic scanner

15. Take the vehicle for a test drive to see if the code reappears

16. Check for Related Codes

17. Sometimes, other related codes may provide additional insight into the issue. Check for any other DTCs that may be present

18. Consult a Professional

19. If the problem persists after performing these steps, it may be best to consult a professional mechanic or technician who has experience with automotive electrical systems. By following these steps, you should be able to diagnose and potentially resolve the issue related to the B1986 code