B1140 Possible Causes
- Faulty Diagnosis Sensor Unit
- Diagnosis Sensor Unit harness is open or shorted
- Diagnosis Sensor Unit circuit poor electrical connection
First diagnose B1140 code
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 terminals.
Cost of diagnosing the B1140 code
Labor: 1.0The cost of diagnosing the B1140 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
B1140 Possible Symptoms
- Air Bag Warning Light ON
B1140 MeaningThe Air Bag Diagnosis Sensor Unit detects the whole SRS electrical system and displays the malfunction either by illuminating or blinking the air bag warning lamp in the combination meter. The Air Bag Diagnosis Sensor Unit detects a shock that exceeds specified level and watches such systems as the driver and passenger air bag, side air bag, curtain air bag, pre-tensioner seat belts and Occupant Classification System (OCS) operate properly.
The Air Bag Diagnosis Sensor Unit contains the “G” sensors for both frontal and side collisions and spare battery function in case of main battery damaged in a collision.
B1140 More InformationNeed more information on how to fix the B1140 code?
Get Access to Factory Service Manuals
B1140 Information for specific makes
- B1140 ACURA Driver Side Power Window Position Detect Circuit Error
- B1140 HONDA Driver Side Power Window Position Detect Circuit Error
- B1140 INFINITI Diagnosis Sensor Unit
- B1140 LEXUS Side Airbag Sensor Assembly Malfunction
- B1140 NISSAN Diagnosis Sensor Unit
- B1140 SCION Side Airbag Sensor Assembly Malfunction
- B1140 TOYOTA Side Airbag Sensor Assembly Malfunction
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.