B1970 code definition
The B1970 trouble code notes a circuit error in the passenger seatback forward switch.
What the B1970 code means
The B1970 code is a standard OBD-II trouble code that detects a passenger seatback forward switch circuit error. The passenger seatback forward switch is the switch for the front passenger seat that controls the forward and rearward movement of the seatback. The switch is usually located on the outboard side of the seat. If the body control module or powertrain control module (PCM) detect a circuit error from the seatback forward switch, then the B1970 code may be triggered.
What causes the B1970 code?
There are two common causes of the B1970 trouble code. The first is damaged electrical components in the power seat system, or in the seatback forward switch. The second is a failed passenger seatback forward switch. While very rare, it is also possible that the code is caused by a defective body control module.
What are the symptoms of the B1970 code?
When the B1970 trouble code is stored, the front passenger seatback forward and rearward switch will likely be inoperable, meaning that the seatback cannot be adjusted forward, and likely rearward too. It is also possible that the check engine soon warning light will illuminate.
How does a mechanic diagnose the B1970 code?
The B1970 trouble code will be diagnosed using a basic OBD-II trouble code scanner. A trained mechanic will use the scanner to view the freeze frame data and assess the code, while also checking for the presence of additional trouble codes. If numerous codes have been detected, then they will need to be diagnosed in the order in which the scanner displays them. The trouble codes will then be reset, the vehicle restarted, and the code checked for. If the B1970 code is no longer present, then an intermittent error or an inaccurate detection should be suspected.
If the code is still present, then the mechanic will begin by visually inspecting all of the electrical components. If any fuses are blown, wires are shorted, or connectors are loose or open, then they will need to be replaced. If the electrical parts are in working order, then a failed passenger seatback forward switch should be assumed.
After any components are repaired or replaced, the trouble codes should again be reset, the vehicle restarted, and the B1970 code checked for. By doing this, the technician will know when the problem is fully resolved.
Common mistakes when diagnosing the B1970 code
The most frequently made error when diagnosing the B1970 code comes from a failure to properly follow the OBD-II diagnosis protocol. The diagnosis protocol should be observed at all times, as it helps ensure efficient and thorough inspections.
It is fairly common for seatback switches to be replaced even when they are fully functional, because damaged electrical parts were overlooked.
How serious is the B1970 code?
The B1970 trouble code will not cause any drivability problems. However, the front passenger seat may not be able to be adjusted, which can cause comfort and practicality concerns. As with all trouble codes, an inspection should be scheduled when the B1970 code is detected.
What repairs can fix the B1970 code?
Repairs for the B1970 trouble code include:
- Replacement of wires, connectors, and fuses in the system
- Replacement of the passenger seatback forward switch
- In rare cases, replacement of the body control module
Additional comments for consideration regarding the B1970 code
This code is a manufacturer specific code, which means that the definition changes depending on the automaker. On some cars the B1970 code represents a passenger seatback forward switch circuit malfunction, while in other vehicles it represents a completely different body problem. Technicians should always be aware of what vehicle they are working on when diagnosing this code.
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