U1549 Code - Body Control Module Lost Communication With Rear Wiper Motor On LIN Bus
Quick Answer
The diagnostic trouble code U1549 indicates that the Body Control Module (BCM) has lost communication with the rear wiper motor on the Local Interconnect Network (LIN) bus. Common causes include Faulty rear wiper motor, Damaged wiring or connectors in the LIN bus circuit, BCM software or hardware issues. 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
- U1549 indicates Body Control Module Lost Communication With Rear Wiper Motor On LIN Bus.
- Common causes
- Common causes include Faulty rear wiper motor, Damaged wiring or connectors in the LIN bus circuit, BCM software or hardware issues.
- 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 U1549 Description
The diagnostic trouble code U1549 indicates that the Body Control Module (BCM) has lost communication with the rear wiper motor on the Local Interconnect Network (LIN) bus. The LIN bus is a communication network used in modern vehicles to connect various control modules and sensors. In this case, the BCM, which is responsible for controlling various body functions such as lighting, wipers, and windows, is unable to communicate with the rear wiper motor.
Common Causes of U1549
- Faulty rear wiper motor
- Damaged wiring or connectors in the LIN bus circuit
- BCM software or hardware issues
- Water intrusion causing corrosion in the electrical connections
- Vehicle collision or impact affecting the rear wiper system
Symptoms of U1549
- Rear wiper not functioning
- Rear wiper working intermittently
- Rear wiper moving at incorrect speeds
- BCM warning light illuminated on the dashboard
How to Fix U1549
- Inspect the rear wiper motor and wiring for any visible damage or corrosion.
- Test the communication between the BCM and rear wiper motor using a diagnostic scan tool.
- Replace the rear wiper motor if it is found to be faulty.
- Repair or replace damaged wiring or connectors in the LIN bus circuit.
- Update or reprogram the BCM software if necessary to resolve communication issues.
Cost to Fix U1549
The cost of repairing the U1549 code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. Generally, the cost of replacing a rear wiper motor can range from $100 to $300, while addressing wiring or connector issues may cost between $50 to $150. Diagnostic fees can range from $50 to $100. Overall, the total repair cost for this issue could range from $200 to $500, excluding any additional parts or labor that may be required. It is advisable to contact local auto repair shops for accurate estimates based on the vehicle make and model.
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Code U1549 Information for Specific Makes
- U1549 Buick — Body Control Module Lost Communication With Rear Wiper Motor On LIN Bus
- U1549 Cadillac — Body Control Module Lost Communication With Rear Wiper Motor On LIN Bus
- U1549 Chevrolet — Body Control Module Lost Communication With Rear Wiper Motor On LIN Bus
- U1549 GMC — Body Control Module Lost Communication With Rear Wiper Motor On LIN Bus
Frequently Asked Questions about U1549 Code
1. What are the common symptoms of OBDII code U1549?
- Common symptoms include the rear wiper not functioning, intermittent operation of the rear wiper, and warning lights on the dashboard related to the rear wiper system.
2. What can cause the Body Control Module to lose communication with the rear wiper motor on the LIN bus?
- Potential causes can include a faulty rear wiper motor, damaged wiring or connectors in the LIN bus circuit, or a malfunctioning Body Control Module.
3. How can I diagnose the root cause of OBDII code U1549?
- A thorough inspection of the rear wiper motor, LIN bus wiring, and connections, as well as testing the Body Control Module, may be necessary using a diagnostic scan tool.
4. Can I continue driving my vehicle with OBDII code U1549?
- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to ensure the rear wiper system functions correctly.
5. What are some basic repair tips for resolving OBDII code U1549?
- Start by checking fuses related to the rear wiper system, inspecting wiring for damage, and ensuring all connections are secure before moving on to replacing components if needed.
6. Is it possible to reset OBDII code U1549 without repairing the issue?
- Resetting the code without addressing the underlying problem will likely cause it to reappear once the system detects the communication failure again.
7. Can extreme weather conditions affect the communication between the Body Control Module and the rear wiper motor?
- Yes, extreme weather conditions can potentially impact the electrical connections and components involved, leading to communication issues and triggering OBDII code U1549.
8. Are there any recalls or technical service bulletins related to OBDII code U1549?
- It’s recommended to check with the vehicle manufacturer or authorized service centers for any recalls or technical service bulletins specific to your vehicle make and model.
9. How much does it typically cost to repair OBDII code U1549?
- The cost of repair can vary depending on the root cause of the issue, but it may involve replacing the rear wiper motor, repairing wiring, or reprogramming the Body Control Module.
10. Can a DIY enthusiast with basic automotive knowledge fix OBDII code U1549?
- Depending on the skill level and tools available, some DIY enthusiasts may be able to diagnose and repair simple issues causing code U1549, such as checking and cleaning connectors or replacing fuses.
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