B1187 Code - Gauge Control Module Lost Communication with the SRS Unit
Quick Answer
The B1187 diagnostic trouble code indicates that the Gauge Control Module has lost communication with the SRS (Supplemental Restraint System) Unit in the vehicle. Common causes include Faulty wiring or connectors between the Gauge Control Module and SRS Unit, Defective Gauge Control Module or SRS Unit, Corrosion or damage to the communication lines. 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
- B1187 indicates Gauge Control Module Lost Communication with the SRS Unit.
- Common causes
- Common causes include Faulty wiring or connectors between the Gauge Control Module and SRS Unit, Defective Gauge Control Module or SRS Unit, Corrosion or damage to the communication lines.
- 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.
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Code B1187 Description
The B1187 diagnostic trouble code indicates that the Gauge Control Module has lost communication with the SRS (Supplemental Restraint System) Unit in the vehicle. This communication failure can impact the vehicle's performance and safety systems, as the SRS Unit is responsible for deploying airbags and other safety features in the event of a collision. The Gauge Control Module, on the other hand, is responsible for displaying information such as speed, fuel level, and engine temperature on the dashboard.
Common Causes of B1187
- Faulty wiring or connectors between the Gauge Control Module and SRS Unit.
- Defective Gauge Control Module or SRS Unit.
- Corrosion or damage to the communication lines.
- Software issues within either component.
Symptoms of B1187
- Malfunctioning airbag warning light on the dashboard.
- Inaccurate or erratic readings on the instrument cluster gauges.
- Loss of functionality in the vehicle's safety systems.
- Illumination of the check engine light or SRS warning light.
How to Fix B1187
- Diagnose the specific cause of the communication failure using a diagnostic scanner.
- Inspect wiring and connectors for any signs of damage or corrosion, repairing or replacing as necessary.
- Test the Gauge Control Module and SRS Unit for proper functionality and replace any faulty components.
- Clear the diagnostic trouble codes and perform a system reset to ensure proper communication between the components.
- Test drive the vehicle to verify that the issue has been resolved and that all systems are functioning correctly.
Cost to Fix B1187
The typical repair costs for addressing a B1187 code can vary depending on the specific cause of the communication failure and the parts that need to be replaced. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. However, it's important to note that diagnostic time and labor rates at auto repair shops can vary based on location, vehicle make and model, and engine type. It's advisable to check with local shops for a more accurate estimate.
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Code B1187 Information for Specific Makes
- B1187 Acura — Gauge Control Module Lost Communication with the SRS Unit
- B1187 Honda — Gauge Control Module Lost Communication with the SRS Unit
- B1187 Lexus — Short To Ground In Passenger Side Air Bag Module Second Stage Squib Circuit
- B1187 Scion — Short To Ground In Passenger Side Air Bag Module Second Stage Squib Circuit
- B1187 Toyota — Short To Ground In Passenger Side Air Bag Module Second Stage Squib Circuit
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 B1187 Code
1. What are the common symptoms of OBDII code B1187?
- Common symptoms include the airbag or SRS warning light illuminating on the dashboard and potential loss of communication with the gauge control module.
2. What are the possible causes of OBDII code B1187?
- The code B1187 can be triggered by issues such as a faulty gauge control module, a damaged SRS unit, wiring problems, or a communication error between the two components.
3. How can I diagnose OBDII code B1187?
- Diagnosing code B1187 involves using a scan tool to retrieve the specific error code, checking the connections and wiring between the gauge control module and SRS unit, and testing the components for proper functionality.
4. Can I drive my vehicle with OBDII code B1187?
- It is not recommended to drive your vehicle with OBDII code B1187 present, as it indicates a potential issue with the SRS system, which is crucial for occupant safety in the event of a collision.
5. How can I repair OBDII code B1187?
- Repairing code B1187 may involve replacing a faulty gauge control module, repairing damaged wiring or connections, resetting the system, or seeking professional assistance for further diagnosis and repair.
6. Are there any safety concerns associated with OBDII code B1187?
- Yes, OBDII code B1187 relates to the Supplemental Restraint System (SRS), which includes airbags. Driving with this code unresolved may compromise the effectiveness of the airbags in the event of an accident.
7. Can a DIY enthusiast fix OBDII code B1187 at home?
- Depending on your experience and access to tools, you may be able to address simple causes like loose connections. However, for more complex issues, it is advisable to seek professional help to ensure proper diagnosis and repair.
8. How much does it cost to repair OBDII code B1187?
- The cost of repairing code B1187 can vary widely depending on the root cause of the issue, the extent of the damage, and whether you choose to repair it yourself or seek help from a mechanic. It's best to get a diagnosis and estimate from a professional.
9. Will resetting the OBDII code B1187 make it go away permanently?
- Resetting the code may temporarily turn off the warning light, but if the underlying issue persists, the code is likely to return. It's crucial to diagnose and fix the root cause to prevent future occurrences.
10. How long does it take to repair OBDII code B1187?
- The repair time for code B1187 can vary depending on the complexity of the issue, the availability of parts, and the expertise of the person performing the repair. Simple fixes may take a few hours, while more involved repairs could require more time.
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