B1951: Seat Rear Up/Down Potentiometer Feedback Circuit Open

Definition

The OBD2 code B1951 indicates a malfunction in the rear seat up/down potentiometer feedback circuit, specifically that the circuit is open, meaning there is a break or disconnection in the electrical path that prevents proper feedback from the seat adjustment mechanism

Common causes

Faulty rear seat potentiometer
Open circuit in wiring harness
Corroded or damaged connectors
Short circuit in wiring
Faulty seat control module
Poor ground connection
Intermittent electrical connection

Common misdiagnoses

Faulty seat motor
Bad wiring or connectors
Defective seat control module
Incorrectly calibrated seat position sensor
Malfunctioning body control module (BCM)
Software issues in the vehicle's control systems
Battery or power supply issues affecting the seat system

Troubleshooting steps

1.Check the Code
Use an OBD-II scanner to confirm the code. Clear the code and see if it returns after a short drive. This can help determine if it’s a persistent issue or a temporary glitch
2.Visual Inspection
3.Inspect the wiring and connectors associated with the rear seat potentiometer. Look for any signs of damage, corrosion, or loose connections
4.Check the potentiometer itself for any physical damage
5.Test the Potentiometer
6.Use a multimeter to test the resistance of the potentiometer. It should change smoothly as you move the seat up and down. If it shows an open circuit or inconsistent readings, the potentiometer may be faulty and need replacement
7.Check for Shorts or Opens
8.Inspect the wiring harness for any shorts to ground or open circuits. Use a multimeter to check continuity in the wires leading to and from the potentiometer
9.Inspect the Seat Control Module
10.If the wiring and potentiometer are in good condition, the issue may lie within the seat control module. Check for any fault codes related to the module and inspect it for damage
11.Check Power and Ground
12.Ensure that the potentiometer is receiving the correct voltage and ground. Use a multimeter to check for proper voltage at the connector
13.Look for Related Codes
14.Check for any other related trouble codes that might provide additional context or indicate a broader issue with the seat system
15.Consult Wiring Diagrams
16.Refer to the vehicle’s service manual for wiring diagrams to understand the circuit better and identify any other components that may be involved
17.Perform a Functional Test
18.After repairs, perform a functional test of the seat adjustment to ensure everything is working correctly
19.Seek Professional Help
20.If you are unable to diagnose or fix the issue, consider seeking help from a professional mechanic or an automotive technician who has experience with your vehicle's make and model. By following these steps, you should be able to identify and resolve the issue related to the B1951 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1.Check the Code

2.Visual Inspection

3.Inspect the wiring and connectors associated with the rear seat potentiometer. Look for any signs of damage, corrosion, or loose connections

4.Check the potentiometer itself for any physical damage

5.Test the Potentiometer

6.Use a multimeter to test the resistance of the potentiometer. It should change smoothly as you move the seat up and down. If it shows an open circuit or inconsistent readings, the potentiometer may be faulty and need replacement

7.Check for Shorts or Opens

8.Inspect the wiring harness for any shorts to ground or open circuits. Use a multimeter to check continuity in the wires leading to and from the potentiometer

9.Inspect the Seat Control Module

10.If the wiring and potentiometer are in good condition, the issue may lie within the seat control module. Check for any fault codes related to the module and inspect it for damage

11.Check Power and Ground

12.Ensure that the potentiometer is receiving the correct voltage and ground. Use a multimeter to check for proper voltage at the connector

13.Look for Related Codes

14.Check for any other related trouble codes that might provide additional context or indicate a broader issue with the seat system

15.Consult Wiring Diagrams

16.Refer to the vehicle’s service manual for wiring diagrams to understand the circuit better and identify any other components that may be involved

17.Perform a Functional Test

18.After repairs, perform a functional test of the seat adjustment to ensure everything is working correctly

19.Seek Professional Help

20.If you are unable to diagnose or fix the issue, consider seeking help from a professional mechanic or an automotive technician who has experience with your vehicle's make and model. By following these steps, you should be able to identify and resolve the issue related to the B1951 code