B1774 Lexus Code - Pressure Sensor Circuit Malfunction
Quick Answer
The Pressure Sensor Circuit consists of the Occupant Classification ECU and the Occupant Detection Sensor. Common causes include Faulty Occupant Detection Sensor, Occupant Detection Sensor harness is open or shorted, Occupant Detection 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
- B1774 Lexus indicates Pressure Sensor Circuit Malfunction.
- Common causes
- Common causes include Faulty Occupant Detection Sensor, Occupant Detection Sensor harness is open or shorted, Occupant Detection 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 B1774 Lexus Description
What are the Possible Causes of the DTC B1774 Lexus?
- Faulty Occupant Detection Sensor
- Occupant Detection Sensor harness is open or shorted
- Occupant Detection Sensor circuit poor electrical connection
- Faulty Occupant Classification ECU
How to Fix the DTC B1774 Lexus?
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 B1774 Lexus 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 B1774 Lexus Code
1. What are common symptoms of OBDII code B1774 in a Lexus?
The common symptoms of OBDII code B1774 in a Lexus include issues with the tire pressure monitoring system (TPMS), inaccurate tire pressure readings, and a TPMS warning light on the dashboard.
2. What are the possible causes of a Pressure Sensor Circuit Malfunction in a Lexus?
Possible causes of a Pressure Sensor Circuit Malfunction (code B1774) in a Lexus include damaged or faulty tire pressure sensors, wiring issues, low tire pressure, or a malfunctioning TPMS control module.
3. How can I diagnose a Pressure Sensor Circuit Malfunction in my Lexus?
To diagnose a Pressure Sensor Circuit Malfunction in your Lexus, you can use an OBDII scanner to retrieve the specific trouble code (B1774). Additionally, visually inspect the tire pressure sensors and their wiring for any signs of damage or corrosion.
4. Can I still drive my Lexus with OBDII code B1774 active?
While you can still drive your Lexus with OBDII code B1774 active, it is recommended to address the issue promptly to ensure accurate tire pressure monitoring and safe driving conditions.
5. How can I reset OBDII code B1774 in my Lexus?
To reset OBDII code B1774 in your Lexus, you can use an OBDII scanner to clear the trouble code after addressing the underlying issue with the pressure sensor circuit malfunction.
6. Are there any DIY repair tips for fixing OBDII code B1774 in a Lexus?
DIY repair tips for fixing OBDII code B1774 in a Lexus include checking and adjusting tire pressure, inspecting and cleaning the tire pressure sensor contacts, and ensuring proper wiring connections.
7. Do I need to replace the tire pressure sensors when dealing with OBDII code B1774 in my Lexus?
In some cases, replacing the tire pressure sensors may be necessary to resolve OBDII code B1774 in a Lexus, especially if the sensors are damaged or not functioning properly.
8. How much does it typically cost to repair OBDII code B1774 in a Lexus?
The cost to repair OBDII code B1774 in a Lexus can vary depending on the underlying issue. It may range from a simple sensor replacement costing around $50 to $200, to more complex wiring or module repairs that could cost several hundred dollars.
9. Will OBDII code B1774 cause any long-term damage to my Lexus if left unaddressed?
Leaving OBDII code B1774 unaddressed in your Lexus may not cause immediate damage, but it can lead to inaccurate tire pressure readings, potential safety concerns, and decreased fuel efficiency over time.
10. Can a Lexus dealership help diagnose and repair OBDII code B1774?
Yes, a Lexus dealership or certified mechanic can help diagnose and repair OBDII code B1774 by using specialized tools and expertise to identify and resolve issues with the pressure sensor circuit malfunction.
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