The B1438 code refers to a circuit failure in the Wiper Mode Select Switch. It is detected by the Body Control Module (BCM), which triggers the Check Engine Light. The code indicates a problem with the switch that controls the wiper modes.
Symptoms of the B1438 code may include the inability to switch between wiper modes, such as intermittent, low, or high speed. The wipers may not function properly or may not work at all.
Possible causes of the B1438 code include a faulty Wiper Mode Select Switch, a malfunctioning BCM, or electrical issues in the circuit.
To fix the B1438 code, a professional technician should perform a thorough diagnosis using specialized tools. They will inspect the Wiper Mode Select Switch, BCM, and the circuit for any faults or damages. Once the problem is identified, the necessary repairs or replacements can be made.
It is important to consult a professional for accurate estimates and to ensure the correct diagnosis and repair procedures are followed.
What does it mean
The B1438 code means there is a circuit failure with the Wiper Mode Select Switch. This can affect the wiper functionality, causing them to not work or operate inconsistently.
It's important to address this code promptly to ensure visibility in bad weather. Resetting the code won't fix the problem; proper diagnosis and repair of the switch circuit are necessary.
what are the symptoms
The symptoms of the B1438 code may include the Engine Light turning on and problems with the wiper functionality. These problems can include the wipers not working correctly or operating inconsistently. Other symptoms that may occur in certain vehicles include:
- The wipers not responding when the wiper mode select switch is used
- The wipers not stopping or pausing when the switch is activated
- The wipers operating at the wrong speed or intermittently
- The wipers not returning to the correct park position
- A delayed or slow response when activating the wipers
The B1438 code can have a significant impact on the wiper functionality, making it difficult or unsafe to use the vehicle in certain weather conditions. It is important to address this code promptly to ensure that the wipers work properly and to avoid any safety concerns related to reduced visibility in rainy or snowy conditions.
What are the causes
The B1438 code can be caused by a faulty Wiper Mode Select Switch or a problem with its harness. Another potential cause is a poor electrical connection in the Wiper Mode Select Switch circuit. Additionally, a faulty Body Control Module (BCM) could trigger the B1438 code.
To diagnose the B1438 code, start by visually inspecting the wiring harness and connectors. Look for any signs of damage or loose connections. Check the Wiper Mode Select Switch for any issues. If necessary, repair or replace the faulty BCM.
During the diagnosis process, it's important to avoid common mistakes. Don't overlook visual inspections or fail to thoroughly check for damaged components. Inspect connector pins for any abnormalities. Lastly, make sure to properly address and repair any issues with the Wiper Mode Select Switch and BCM.
Following the correct diagnostic procedures will help you accurately diagnose and resolve the B1438 code.
What Tools are Needed to diagnose
To diagnose the B1438 code accurately, you will need certain diagnostic tools. Here are the tools you need:
- OBD-II scanner: This tool retrieves the fault codes stored in the car's computer system, including the B1438 code.
- Multimeter: A multimeter measures voltage, resistance, and continuity in the electrical circuits related to the Wiper Mode Select Switch.
- Wiring diagram: This diagram helps trace circuit connections and identify any potential wiring issues.
- Circuit tester: A circuit tester checks the integrity of electrical circuits and looks for open or short circuits.
- Wiper Mode Select Switch tester: This specialized tool tests the functionality of the Wiper Mode Select Switch to determine if it's faulty.
To avoid common diagnostic mistakes when dealing with the B1438 code, make sure to thoroughly inspect the wiring harness and connectors for damage or poor connections. Follow the diagnostic procedure step by step, and use the correct diagnostic tools for the job.
How to fix Step by Step
Step 1: Begin by diagnosing the DTC B1438 using the necessary tools and equipment.
Step 2: Conduct a visual inspection of the wiring harness and connectors related to the issue. Look for any signs of damage or poor electrical connections.
Step 3: Check for any broken, bent, pushed out, or corroded connector pins.
Step 4: If any issues are found with the Wiper Mode Select Switch, address them accordingly.
Step 5: Check for any faulty components and repair or replace them as needed.
Step 6: In some cases, the Body Control Module (BCM) may need to be repaired or replaced to resolve the code.
Step 7: To prevent DTC B1438 recurrence, regularly inspect and maintain the wiper system and related components.
Step 8: Address any issues promptly and follow proper diagnostic procedures to prevent the code from reoccurring.
What are the Common Diagnosis Mistakes
One common mistake in diagnosing the B1438 code is not thoroughly checking the wiring harness and connectors for any damage or poor electrical connections. It is important to carefully inspect these parts as they can often be the main reason for the code.
Here are some common misdiagnoses and related DTCs to be aware of:
- Mistakenly identifying the Wiper Mode Select Switch as the issue when the problem actually lies with the wiring harness or connectors.
- Failing to check for other related DTCs that may be present along with the B1438 code.
- Overlooking the possibility of a faulty Body Control Module (BCM) as a potential cause.
- Not considering other potential causes that are not listed, such as problems with the vehicle's power supply or ground connections.
- Neglecting to conduct a thorough visual inspection of all components involved in the wiper system, including the motor and relay.
What is the Repair Cost
The repair cost for a B1438 code can vary depending on factors such as location, vehicle make and model, and additional repairs needed. Labor rates range from $75 to $150 per hour. It's important to consult a professional for an accurate estimate.
In some cases, the issue can be fixed without replacing the Body Control Module (BCM). Proper diagnosis is crucial to avoid further damage.
Can I drive safely with this code?
Driving with the B1438 code may pose risks. It indicates a circuit failure with the Wiper Mode Select Switch, potentially leading to further vehicle damage.
Visually inspect the wiring and connectors for damage. Address issues with the switch and consider replacing the Body Control Module.
Consult a professional for proper diagnosis and repair.
Conclusion
In conclusion, the B1438 code is an indication of a circuit failure related to the Wiper Mode Select Switch. It is important to address this code promptly to prevent further damage or issues.
The potential causes of the code include a faulty switch, open or shorted harness, poor electrical connection, or a faulty BCM. Diagnosing and fixing the issue involves visually inspecting the wiring harness and connectors, checking for damaged components, and repairing or replacing the faulty BCM.
Consulting a professional is recommended for accurate estimates and proper diagnosis and repair.