B1651 Code - Manual Cut-Off Switch Trouble
Quick Answer
The Airbag Cut-Off Switch circuit consists of the Center Airbag Sensor and the Airbag Cut-Off Switch. Common causes include Faulty Airbag Cut-Off Switch, Airbag Cut-Off Switch harness is open or shorted, Airbag Cut-Off Switch 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
- B1651 indicates Manual Cut-Off Switch Trouble.
- Common causes
- Common causes include Faulty Airbag Cut-Off Switch, Airbag Cut-Off Switch harness is open or shorted, Airbag Cut-Off Switch 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 B1651 Description
What are the Possible Causes of the DTC B1651?
- Faulty Airbag Cut-Off Switch
- Airbag Cut-Off Switch harness is open or shorted
- Airbag Cut-Off Switch circuit poor electrical connection
- Faulty Center Airbag Sensor Assembly
How to Fix the DTC B1651?
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 B1651 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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Information for Specific Makes
- B1651 Lexus — Manual Cut-Off Switch Trouble
- B1651 Scion — Manual Cut-Off Switch Trouble
- B1651 Toyota — Manual Cut-Off Switch Trouble
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 B1651 Code
1. What are the common symptoms of OBDII code B1651 (Manual Cut-Off Switch Trouble)?
- Common symptoms include difficulty starting the vehicle, engine stalling, and the inability to shift gears.
2. What are the possible causes of OBDII code B1651?
- The code B1651 can be caused by a faulty manual cut-off switch, damaged wiring or connectors related to the switch, or a malfunction in the vehicle's security system.
3. How can I diagnose the issue related to OBDII code B1651?
- You can diagnose the issue by checking the manual cut-off switch for any signs of damage, testing the switch for continuity, and inspecting the wiring and connectors for any issues.
4. Can I repair OBDII code B1651 myself?
- If you have experience with automotive electrical systems, you may be able to repair the issue yourself by replacing the faulty manual cut-off switch or repairing any damaged wiring or connectors.
5. Is it safe to drive with OBDII code B1651 present?
- It is not recommended to drive with OBDII code B1651 present, as it can lead to potential safety hazards such as engine stalling or the inability to control the vehicle's operation.
6. How much does it cost to repair OBDII code B1651 at a mechanic?
- The cost of repairing OBDII code B1651 at a mechanic can vary depending on the extent of the issue and the labor rates in your area. It is advisable to get a few quotes from different mechanics for comparison.
7. Can OBDII code B1651 be triggered by other underlying issues?
- While OBDII code B1651 is primarily related to the manual cut-off switch, it can also be triggered by other underlying issues such as a malfunctioning security system or a fault in the vehicle's starting system.
8. Will resetting the OBDII system clear the B1651 code?
- Resetting the OBDII system may temporarily clear the B1651 code, but if the underlying issue is not addressed, the code is likely to reappear once the problem resurfaces.
9. Are there any preventive measures to avoid OBDII code B1651 from occurring?
- Regularly inspecting the manual cut-off switch, keeping the wiring and connectors in good condition, and following the manufacturer's maintenance guidelines can help prevent OBDII code B1651 from occurring.
10. Can OBDII code B1651 affect the overall performance of the vehicle?
- Yes, OBDII code B1651 can significantly impact the overall performance of the vehicle by causing starting issues, engine stalling, and safety concerns related to the manual cut-off switch operation.
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