B2174: Window Driver Rear Remote Up Switch Short to Battery

Definition

The OBD2 code B2174 indicates a malfunction related to the rear window driver's remote up switch, specifically that there is a short circuit to the battery, causing the switch to continuously receive power

Common causes

Shorted wiring or connectors
Faulty window switch
Malfunctioning window motor
Corroded or damaged electrical connections
Faulty body control module (BCM)
Water intrusion or moisture damage
Improper installation or modifications

Common misdiagnoses

Faulty window switch
Wiring harness issues
Body control module (BCM) failure
Short circuit in the door panel
Defective window motor
Grounding issues
Incorrectly installed aftermarket accessories

Troubleshooting steps

1. Verify the Code

Use an OBD-II scanner to confirm the presence of the B2174 code. Clear the code and see if it returns after a short drive
2. Inspect the Wiring and Connectors
3. Check the wiring harness and connectors associated with the rear window switch for any signs of damage, fraying, or corrosion
4. Look for any exposed wires that may be shorting against the vehicle body or other components
5. Test the Switch
6. Remove the rear window switch and test it with a multimeter to ensure it is functioning correctly
7. Check for continuity when the switch is pressed and ensure it is not stuck in the "up" position
8. Check for Short Circuits
9. Inspect the circuit for any shorts to ground or battery. Use a multimeter to check for continuity between the switch wires and the vehicle chassis
10. If a short is found, trace the wiring back to locate the source of the short
11. Inspect the Window Motor
12. Check the rear window motor for any signs of malfunction. A faulty motor can sometimes cause issues with the switch
13. Test the motor by applying direct battery voltage to see if it operates correctly
14. Examine the Body Control Module (BCM)
15. The BCM controls the power windows. If the BCM is malfunctioning, it may send incorrect signals to the switch
16. Check for any fault codes in the BCM and inspect its connections
17. Check Fuses
18. Inspect the fuses related to the power windows. A blown fuse can sometimes cause erratic behavior in the system
19. Look for Water Intrusion
20. Check for any signs of water intrusion in the door panel or wiring harness, as moisture can cause electrical issues
21. Reassemble and Test
22. After performing the necessary repairs, reassemble any components you removed and test the window operation to see if the issue is resolved
23. Consult a Professional
24. If the problem persists after following these steps, it may be best to consult a professional mechanic or an automotive electrician for further diagnosis. By following these steps, you should be able to identify and resolve the issue related to the B2174 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Verify the Code

2. Inspect the Wiring and Connectors

3. Check the wiring harness and connectors associated with the rear window switch for any signs of damage, fraying, or corrosion

4. Look for any exposed wires that may be shorting against the vehicle body or other components

5. Test the Switch

6. Remove the rear window switch and test it with a multimeter to ensure it is functioning correctly

7. Check for continuity when the switch is pressed and ensure it is not stuck in the "up" position

8. Check for Short Circuits

9. Inspect the circuit for any shorts to ground or battery. Use a multimeter to check for continuity between the switch wires and the vehicle chassis

10. If a short is found, trace the wiring back to locate the source of the short

11. Inspect the Window Motor

12. Check the rear window motor for any signs of malfunction. A faulty motor can sometimes cause issues with the switch

13. Test the motor by applying direct battery voltage to see if it operates correctly

14. Examine the Body Control Module (BCM)

15. The BCM controls the power windows. If the BCM is malfunctioning, it may send incorrect signals to the switch

16. Check for any fault codes in the BCM and inspect its connections

17. Check Fuses

18. Inspect the fuses related to the power windows. A blown fuse can sometimes cause erratic behavior in the system

19. Look for Water Intrusion

20. Check for any signs of water intrusion in the door panel or wiring harness, as moisture can cause electrical issues

21. Reassemble and Test

22. After performing the necessary repairs, reassemble any components you removed and test the window operation to see if the issue is resolved

23. Consult a Professional

24. If the problem persists after following these steps, it may be best to consult a professional mechanic or an automotive electrician for further diagnosis. By following these steps, you should be able to identify and resolve the issue related to the B2174 code