Engine-Codes - Scion - B0121 Scion

B0121 Scion Code - Right Front Seat Belt Buckle Switch Malfunction

- Code Popularity: 2,363 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC B0121 Scion?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Right Front Seat Belt Buckle Switch
  • Right Front Seat Belt Buckle Switch harness is open or shorted
  • Right Front Seat Belt Buckle Switch circuit poor electrical connection
  • Faulty Air Bag Control Module
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How to Fix the DTC B0121 Scion?

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 pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the B0121 Scion code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Air Bag Warning Light ON

What Does the B0121 Scion Code Mean?

The right front seat belt buckle switch circuit consists of the air bag center sensor and right front seat belt buckle assembly. The Air Bag Control Module monitors the Right Front Seat Belt Buckle Switch. The Air Bag Control Module sets the OBDII code when the Right Front Seat Belt Buckle Switch is not to factory specifications.

B0121 Scion Code - Right Front Seat Belt Buckle Switch Malfunction

Need more Information on the Code?

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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.