AutoCodes – Scion – B1921 Scion

B1921 Scion Code - Open In Rear Pretensioner Squib RH Circuit

Quick Answer

The Rear Pretensioner Squib Right (RH) Circuit consists of the Center Airbag Sensor Assembly and the Rear Seat Outer Belt Assembly Right (RH). Common causes include Faulty Rear Seat Outer Belt Assembly Right (RH) (Rear Pretensioner Squib RH), Rear Seat Outer Belt Assembly Right (RH) harness is open or shorted, Rear Seat Outer Belt Assembly Right (RH) circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B1921 Scion indicates Open In Rear Pretensioner Squib RH Circuit.
Common causes: Common causes include Faulty Rear Seat Outer Belt Assembly Right (RH) (Rear Pretensioner Squib RH), Rear Seat Outer Belt Assembly Right (RH) harness is open or shorted, Rear Seat Outer Belt Assembly Right (RH) circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,004

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 28, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1921 Scion Description

The Rear Pretensioner Squib Right (RH) Circuit consists of the Center Airbag Sensor Assembly and the Rear Seat Outer Belt Assembly Right (RH). This circuit instructs the Supplemental Restraint System (SRS) to deploy when deployment conditions are met. The Diagnostic Trouble Code (DTC) is stored when a malfunction is detected in the Rear Pretensioner Squib RH Circuit.

OBDII Code B1921 Scion - Open In Rear Pretensioner Squib RH Circuit - AutoCodes.com — B1921 Scion Code - Open In Rear Pretensioner Squib RH Circuit

What does this mean?

What are the Possible Causes of the DTC B1921 Scion?

Faulty Rear Seat Outer Belt Assembly Right (RH) (Rear Pretensioner Squib RH)
Rear Seat Outer Belt Assembly Right (RH) harness is open or shorted
Rear Seat Outer Belt Assembly Right (RH) circuit poor electrical connection
Faulty Center Airbag Sensor Assembly

How to Fix the DTC B1921 Scion?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1921 Scion code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B1921 Scion code?

Need more information on how to fix the B1921 Scion code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1921 Scion 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.

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1921 Scion Code

1. What are common symptoms of OBDII code B1921 in a Scion related to an open in the rear pretensioner squib RH circuit?

The common symptoms include the airbag warning light illuminating on the dashboard and potential failure of the rear pretensioner system in the event of a collision.

2. What could be the possible causes of an open in the rear pretensioner squib RH circuit triggering code B1921 in a Scion?

Possible causes may include damaged wiring or connectors in the rear pretensioner system, a faulty pretensioner squib RH, or issues with the airbag control module.

3. How can I diagnose the source of the open circuit causing OBDII code B1921 in my Scion's rear pretensioner squib RH circuit?

To diagnose the issue, you will need to perform a thorough inspection of the wiring, connectors, and components in the rear pretensioner system using a multimeter to check for continuity and potential shorts.

4. Is it safe to drive my Scion with the OBDII code B1921 indicating an open in the rear pretensioner squib RH circuit?

It is not recommended to drive the vehicle with this code present, as it indicates a potential safety issue with the rear pretensioner system, which may affect the proper deployment of the airbags in case of an accident.

5. Can I reset the OBDII code B1921 related to an open in the rear pretensioner squib RH circuit in my Scion without fixing the underlying issue?

Resetting the code without addressing the root cause will not solve the problem, and the code is likely to reappear once the system detects the open circuit again.

6. What repair tips can help me fix the open circuit causing OBDII code B1921 in the rear pretensioner squib RH circuit of my Scion?

Repair tips include carefully inspecting and repairing damaged wiring, replacing faulty connectors or components, and ensuring all connections are secure and properly seated.

7. Are there any safety precautions to consider when working on the rear pretensioner squib RH circuit in my Scion to resolve OBDII code B1921?

Safety precautions should include disconnecting the vehicle's battery, waiting for the airbag system to fully discharge, and following proper procedures to avoid accidental airbag deployment during repairs.

8. How much can I expect to spend on repairing the open circuit issue triggering OBDII code B1921 in the rear pretensioner squib RH circuit of my Scion?

The cost of repair will vary depending on the exact cause of the open circuit, the need for replacement parts, and labor charges from a professional mechanic. It is advisable to obtain quotes from reputable repair shops.

9. Can a DIY enthusiast with automotive experience fix the open circuit issue causing OBDII code B1921 in the rear pretensioner squib RH circuit of a Scion?

While some DIY enthusiasts may have the skills to diagnose and repair wiring issues, working on airbag systems requires specialized knowledge and tools. It is recommended to consult a professional for such repairs.

10. How often should I have the rear pretensioner system inspected in my Scion to prevent issues like OBDII code B1921 related to an open circuit?

Regular inspections of the airbag system, including the rear pretensioner squib RH circuit, should be part of routine maintenance to ensure proper functionality and early detection of any potential issues before they escalate.