B1121 Nissan Code - Left Air Bag Satellite Sensor
Quick Answer
When the Air Bag Diagnosis Sensor Unit (ACU) define the both signal voltage of the “G†sensor and the Safing sensor to be that of the collision which exceeds the specified level, the driving circuit switches on and feeds the electric ignitor of both the side air bag and curtain air bag. Common causes include Faulty Left Air Bag Satellite Sensor, Left Air Bag Satellite Sensor harness is open or shorted, Left Air Bag Satellite Sensor 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
- B1121 Nissan indicates Left Air Bag Satellite Sensor.
- Common causes
- Common causes include Faulty Left Air Bag Satellite Sensor, Left Air Bag Satellite Sensor harness is open or shorted, Left Air Bag Satellite Sensor 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.
Code B1121 Nissan Description
The Satellite Sensor is an integrated type of the G sensor element for side collision with output terminals for signal voltage.
What are the Possible Causes of the DTC B1121 Nissan?
- Faulty Left Air Bag Satellite Sensor
- Left Air Bag Satellite Sensor harness is open or shorted
- Left Air Bag Satellite Sensor circuit poor electrical connection
How to Fix the DTC B1121 Nissan?
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 B1121 Nissan 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.
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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.
Frequently Asked Questions about B1121 Nissan Code
1. What does the OBDII code B1121 mean on a Nissan?
B1121 indicates a malfunction in the left airbag satellite sensor or its circuit, which monitors crash detection for airbag deployment.
2. What are the common symptoms of a B1121 Nissan code?
Symptoms include the airbag warning light illuminating on the dashboard and possible deactivation of the airbag system.
3. What causes the B1121 code to appear in a Nissan?
Possible causes include a faulty left airbag satellite sensor, damaged wiring or connectors, or corrosion in the sensor circuit.
4. Is it safe to drive with a B1121 code in a Nissan?
No, it's not safe. The airbag system may not deploy correctly during a collision, posing a safety risk.
5. How can I diagnose a B1121 code on my Nissan?
Use an OBDII scanner to confirm the code, inspect the left airbag satellite sensor for damage, and check for loose or corroded wiring and connectors.
6. How do I fix a B1121 Nissan code?
Repairs may involve replacing the left airbag satellite sensor, repairing damaged wiring, or cleaning and securing corroded connectors.
7. Where is the left airbag satellite sensor located in a Nissan?
The left airbag satellite sensor is typically located near the front left side of the vehicle, often beneath the seat or behind interior trim panels.
8. Can I clear the B1121 code without making repairs?
Clearing the code without fixing the underlying issue is not recommended, as the airbag system may remain nonfunctional.
9. How much does it cost to repair a B1121 code on a Nissan?
Repair costs vary but can range from $150 to $400 for parts and labor, depending on the specific issue and vehicle model.
10. Can a B1121 code trigger other airbag-related codes in a Nissan?
Yes, a B1121 code can sometimes lead to additional airbag system codes if the malfunction affects other components in the circuit.
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