OBD code B3978 indicates a fault in the Inflatable Restraint Sensing and Diagnostic Module system.
Symptoms include the Engine Light being ON.
The issue is commonly caused by a faulty module, wiring harness issues, or poor electrical connections.
It is crucial to address promptly for safety reasons.
To fix, inspect the wiring harness, connectors, and components for any damage or corrosion.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
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Symptoms of the b3978 OBD Code
The vehicle displays a warning light indicating a fault with the b3978 code stored in the system.
- Symptoms: Service Engine Soon Warning Light illuminated.
- Possible loss of communication with the rear seat entertainment control module.
Causes of the b3978 OBD Code
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Common triggers for fault code B3978 include faulty wiring, damaged connectors, or a defective control module.
- B3978 can be caused by a faulty Inflatable Restraint Sensing and Diagnostic Module.
- An open or shorted Inflatable Restraint Sensing and Diagnostic Module harness.
- A poor electrical connection in the Inflatable Restraint Sensing and Diagnostic Module circuit.
- A faulty Body Control Module (BCM).
Fixing Error Code b3978 Step By Step
To resolve fault code B3978, inspect and repair the circuit for the rear wiper motor control.
- To fix OBDII code B3978, review the possible causes related to the code.
- Visually examine the wiring harness and connectors associated with the code.
- Check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Repair or replace any damaged wiring or connectors found during the inspection.
- Clear the fault code from the vehicle’s computer using a scan tool.
- Test drive the vehicle to verify if the issue has been resolved.
Cost Of Fixing b3978 Fault Code
Diagnosing and repairing fault code B3978 may require replacement of the steering wheel position sensor.
The cost to diagnose and fix OBD code B3978 depends on the estimated 1. 0hour repair time.
Labor rates usually range from $75 to $150 per hour, so the general cost could be between $75 and $150. Factors like shop rates and complexity of the repair can influence the final cost.
Details of the b3978 OBD Code
B3978 code indicates a malfunction in the rear heated seat module communication circuit.
OBD code B3978 indicates a fault with the rear wiper motor relay circuit.
This code is triggered by the body control module (BCM) when it detects an issue with the rear wiper motor relay circuit.
The BCM monitors the circuit for proper operation and will set this code if it detects a fault such as a short circuit, open circuit, or excessive current draw in the rear wiper motor relay circuit.
This code is specific to the rear wiper system in the vehicle.
Mechanic’s Tech Notes
This code indicates a fault with the rear wiper motor circuit.
OBDII code B3978 indicates a communication error between the body control module and the transmission control module.
To diagnose, use a voltmeter to check TCM power and ground.
Verify TCM response over the CAN network using a scan tool.
Visually inspect wiring harnesses and connectors for damage, and check for broken, bent, or corroded pins.
Reflashing the modules may be necessary.
FAQ
OBD code B3978 indicates an issue with the Inflatable Restraint Sensing and Diagnostic Module circuit. Check wiring, connectors, and components for faults.
Common symptoms of OBD code B3978 include Engine Light ON, caused by issues with the Inflatable Restraint Sensing and Diagnostic Module or Body Control Module. Fix: Inspect wiring and connectors.
Diagnose and repair OBD code B3978 by checking for faulty Inflatable Restraint Sensing Module, harness issues, or BCM problems. Inspect wiring and connectors for damage or corrosion.
Wrap Up
If your vehicle is displaying OBD code b3978, you may experience issues with the rear wiper motor circuit.
This could be caused by a faulty rear wiper motor, damaged wiring, or poor electrical connections in the circuit.
To address OBD code b3978, start by inspecting the wiring harness and connectors related to the rear wiper motor.
Look for any signs of damage, corrosion, or loose connections.
Test the rear wiper motor for proper operation and replace it if necessary.
