Nissan Altima B1118 Z B1120 Satellite Sensor LH

When faced with the B1120 Nissan air bag code, diagnosing and fixing the issue can be a crucial task for vehicle safety. This article provides a comprehensive guide, merging information from different sources to offer a detailed approach to address this specific air bag code.

Understanding B1120 Nissan Code

The B1120 Nissan code is associated with the Left Air Bag Satellite Sensor. When the Air Bag Diagnosis Sensor Unit (ACU) detects a collision exceeding a specified level, it activates the electric ignitor for both the side air bag and curtain air bag. The Satellite Sensor, integrated with the G sensor element for side collisions, plays a vital role in this process.

Symptoms and Cost Analysis

Possible Symptoms

One of the key symptoms of the B1120 Nissan code is the illumination of the Air Bag Warning Light. Recognizing this symptom is crucial for prompt action.

Cost of Diagnosis

To diagnose the B1120 Nissan code, it typically requires 1.0 hour of labor. However, costs can vary depending on factors such as the vehicle’s make and model, location, and engine type. Auto repair shops generally charge between $75 and $150 per hour.

DIY Diagnostic Steps for B1120 Nissan

Step-by-Step Diagnosis

For those inclined towards DIY solutions, here is a step-by-step guide for locating and addressing the B1120 Nissan code:

1. Seat Removal

  • Remove the 4 bolts securing the seat to tilt it up for better access.
  • Remove the front plastic along the seat.

2. Seat Belt Area

  • Remove the seat belt bolt at the bottom of the side pillar.
  • Remove the pillar covering the seat belt and back door floor plastic.

3. Sensor Inspection

  • Lift the carpet under the seat belt tensioner to access the sensor with a yellow plug and two bolts.
  • Use an ohmmeter to check the sensor’s reading for confirmation.

4. Connector and Wiring Check

  • If the sensor is good, check the connector. Replace it if necessary.
  • If issues persist, inspect the wiring for damage, although this can be challenging due to the wiring path.

Precautions for SRS Service

Safety Measures

Given the critical nature of air bag systems, it is essential to follow specific precautions when servicing the Supplemental Restraint System (SRS):

  • Never probe the electrical connectors on air bags, side air curtain modules, or seat belts.
  • Avoid disassembling or tampering with safety belt components.
  • Do not use electrical test equipment on SRS circuits unless instructed in the service manual.
  • Turn off the ignition, disconnect both battery cables, and wait at least 3 minutes before servicing the SRS.

Professional Assistance

If uncertain or uncomfortable with DIY diagnostics, it is advisable to seek professional help. Finding a repair shop in your area to diagnose and fix the B1120 Nissan code ensures a thorough and accurate resolution.

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