B1973 – OBD-II DTC

OBD-II DTC B1973 – Passenger Rear Seat Down Switch Circuit Short to Battery

DTC B1973 meaning

DTC B1973 refers to a diagnostic trouble code indicating a short circuit in the passenger rear seat down switch circuit to battery. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors various vehicle components and systems for faults. When the system detects that the circuit is shorted to battery voltage, it triggers this specific code, signaling a potential issue with the switch or its wiring.

DTC B1973 symptoms

Common symptoms associated with DTC B1973 may include:

• Inoperable passenger rear seat down switch
• Warning lights illuminated on the dashboard
• Possible malfunction of the rear seat folding mechanism
• Increased battery drain if the circuit remains shorted

DTC B1973 causes

Several factors can lead to the occurrence of DTC B1973, including:

• Faulty passenger rear seat down switch
• Damaged or frayed wiring in the circuit
• Corrosion or poor connections at the switch or connector
• Short circuit due to moisture intrusion or physical damage

DTC B1973 seriousness

DTC B1973 is considered a moderate issue. While it may not immediately affect the vehicle’s drivability, it can lead to further complications, such as:

• Inability to use the rear seat folding feature
• Potential battery drain if the circuit remains shorted
• Increased risk of electrical issues if left unaddressed

How to diagnose DTC B1973

To diagnose DTC B1973, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the B1973 code.
2. Inspect the passenger rear seat down switch for visible damage or wear.
3. Check the wiring and connectors for signs of corrosion, fraying, or shorts.
4. Test the switch with a multimeter to ensure it operates correctly.
5. Examine the circuit for continuity and proper voltage levels.

How to fix DTC B1973 step-by-step instructions

To fix DTC B1973, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to prevent electrical shock.
2. Remove the passenger rear seat down switch from its mounting location.
3. Inspect the switch for damage replace it if necessary.
4. Examine the wiring harness for any signs of damage or shorts.
5. Repair or replace any damaged wiring or connectors.
6. Reconnect the switch and ensure all connections are secure.
7. Reconnect the vehicle’s battery.
8. Clear the DTC using an OBD-II scanner and test the system to ensure the issue is resolved.