B1637 Lost Communication with Rear Airbag Sensor Left

OBD2 Code: B1637

Description: Lost communication with rear airbag sensor left.

Definition: The OBD2 code B1637 indicates a loss of communication between the vehicle’s main control module and the rear airbag sensor located on the left side. This can be due to wiring issues, connector problems, or a faulty sensor, which may affect the proper deployment of airbags in case of an accident.

B1637: Lost communication with rear airbag sensor left
Severity: Moderate

Common Causes

B1637 – Lost Communication with Rear Airbag Sensor Left

Common causes:

• Faulty rear airbag sensor left
• Wiring issues such as damaged wires or poor connections
• Issues with the airbag control module
• Interference from other electronic devices

Common Misdiagnosis

OBD2 Code: B1637

Description: Lost communication with rear airbag sensor left

Common Misdiagnosis: Replacing the airbag sensor without checking for wiring issues or connector problems.

Common Diagnostic Steps

OBD2 Code: B1637

Description: Lost communication with rear airbag sensor left

• Check for any stored codes in the vehicle’s computer system to identify related issues.
• Inspect the wiring and connectors leading to the rear airbag sensor on the left side for any signs of damage, corrosion, or disconnection.
• Test the power supply and ground connections at the rear airbag sensor to ensure they are functioning correctly.
• Use a scan tool to check for live data from the rear airbag sensor and verify if it is communicating properly with the vehicle’s control module.
• If necessary, replace or repair any damaged wiring, connectors, or components associated with the rear airbag sensor.
• Clear all codes and test drive the vehicle to see if the code returns, indicating a successful repair.