| All About OBDII Engine Codes
AutoCodes - Generic - B1637

B1637 Code - Lost Communication With Rear Airbag Sensor Left

- Code Popularity: 5,516 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
By - Updated Oct 10, 2022
Share on Facebook   Share on Twitter   Share on Linkedin

|Code B1637 Possible Causes

  • Faulty Rear Airbag Sensor Left (LH)
  • Rear Airbag Sensor Left harness is open or shorted
  • Rear Airbag Sensor Left circuit poor electrical connection
  • Faulty Center Airbag Sensor Assembly

|How do I Fix the Code B1637?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Does your Car have Safety Recalls? → Check here

|What is the Cost to Diagnose the Code B1637?

Labor: 1.0

The cost of diagnosing the B1637 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

|What are Code B1637 Possible Symptoms?

  • Air Bag Warning Light ON

|Code B1637 Description

The Side Airbag Sensor Left (LH) or Rear Airbag Sensor Right (RH) consists of the Diagnostic Circuit, the Lateral Deceleration Sensor, etc. If the Center Airbag Sensor receives signals from the Lateral Deceleration Sensor, it determines whether the Supplemental Restraint System (SRS) should be activated. The Diagnostic Trouble Code (DTC) B1637 is stored when a malfunction is detected in the Rear Airbag Sensor Left circuit.

OBDII Code B1637 - Lost Communication With Rear Airbag Sensor Left -
B1637 Code - Lost Communication With Rear Airbag Sensor Left

|Need More Information on the B1637 Code?

Need more information on how to fix the B1637 code? Get Access to Factory Service Manuals

|Information for Specific Makes

|Need Help with the B1637 Code?

Get the B1637 code diagnosed by a professional: Find a repair shop in your area

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

  • Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
  • Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
  • Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
  • Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.
Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

|Code B1637 comments

Help us improve Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the B1637 code? Have you replaced any parts?
Any information is appreciated. Thanks