2017-2025 Honda Ridgeline Blind Spot Radar: Failure, Replacement, and Calibration
Diagnosing the 'Blind Spot Info System Problem' warning and understanding the critical calibration process for your Ridgeline's radar sensor.
- This part is a radar module for the Blind Spot Information (BSI) system, not a video camera.
- After replacement, the radar module MUST be professionally calibrated (aimed) using special tools. This is not a DIY step.
- The primary symptom of failure is the "Blind Spot Info System Problem" message on the dashboard.
- Even minor rear bumper impacts can damage or misalign the sensor, causing a system fault.
Symptoms of a Failing Blind Spot Radar
The most common sign of a problem with the blind spot radar system is a clear warning message on your instrument panel.
- "Blind Spot Info System Problem" Message: This is the primary indicator of a fault. When this message appears, the Blind Spot Information (BSI) and Cross Traffic Monitor (CTM) systems are disabled. An amber warning light will also typically illuminate on the dashboard. 🎬 Watch: What this dashboard warning looks like in action
- Intermittent Operation: In some cases, the warning may appear intermittently, especially after starting the truck in cold or damp weather. Restarting the vehicle may temporarily clear the fault.
- System Inoperative: The BSI indicator lights on the A-pillars will not light up when cars are in your blind spot, and the CTM will not provide alerts when reversing.
Forum discussions indicate that sometimes these warnings can be triggered by other vehicle issues, such as a faulty torque converter in some 2017 models, which can cause various electronic miscues. However, if the warning is specific to the BSI system, the issue is most likely with one of the radar units or their wiring.
Known Issues, TSBs, and Recalls
While there are no widespread recalls specifically for the blind spot radar units on the 2017-2025 Ridgeline, owners have reported several common issues.
- Sensitivity to Impact: The radar units are located in the rear corners, making them vulnerable during a rear-end collision. Even a minor bumper tap that leaves no visible damage can be enough to break the unit or knock it out of alignment, triggering a system fault.
- Connector Corrosion: The wiring connectors for the radar units are located behind the bumper and can be exposed to moisture and road salt, potentially leading to corrosion and a poor connection. Some owners have reported that cleaning the connectors resolved intermittent issues.
- Intermittent Faults: Owners frequently report the "Blind Spot Info System Problem" message appearing randomly and sometimes clearing after the vehicle is restarted. This can be caused by a water leak shorting a connection, a failing sensor, or a software glitch.
- Related Recalls: While not directly for the BSI radar, there have been recalls for the rearview camera wiring harness on 2017-2024 models, which can fail from the tailgate being opened and closed. This highlights the general vulnerability of wiring in the rear of the vehicle.
Important: The initial prompt for this article incorrectly identified this part as a "Video Camera." The part numbers 36930T6ZA02, 36931-T6Z-A12, and 36931T6ZA12 refer to the right (passenger side) Blind Spot Radar Module, which uses radio waves, not a visual feed.
Buying a Used Blind Spot Radar Module
Purchasing a used OEM radar module can offer significant savings over a new part. However, there are critical factors to consider to ensure you get a functional component.
- Physical Inspection: Carefully inspect the used unit for any signs of damage. Look for cracks in the black plastic housing, damage to the mounting tabs, and bent or corroded pins in the electrical connector. Do not purchase a unit with any visible physical damage.
- Verify Part Numbers: Match the part number exactly. The primary part number for the right (passenger) side is 36931-T6Z-A12, which supersedes 36931-T6Z-A11. The corresponding left (driver) side part number is 36936-T6Z-A12.
- Budget for Calibration: This is the most important factor. A used radar unit, no matter how perfect, is useless until it is professionally calibrated. This process, called "radar aiming," is mandatory after installation and can only be done by a dealer or a qualified shop with Honda's diagnostic software (i-HDS) and special radar reflectors. Factor this significant cost into your budget.
- Why Used OEM is the Best Choice: Aftermarket blind spot radar modules are not a viable option for this system. The BSI is deeply integrated with the vehicle's safety software, and only a genuine Honda part will communicate correctly. A used OEM part is a reliable alternative to an expensive new one.
Replacement and Calibration
Physically replacing the radar unit is straightforward, but completing the job requires professional-level tools.
Installation Difficulty: 4 out of 5
The physical swap is relatively easy (2/5), but the mandatory, non-DIY calibration makes the total job difficult (4/5).
- Bumper Removal: The rear bumper cover must be removed to access the radar units, 🎬 See this step-by-step rear bumper removal walkthrough which are bolted to the vehicle's body in the corners.
- Sensor Replacement: Once the bumper is off, the sensor is simple to unbolt, unplug, and replace with the new unit.
- Radar Aiming (Calibration): This step is not optional and cannot be done at home. The vehicle must be taken to a Honda dealership or a specialty shop with the correct ADAS (Advanced Driver-Assistance Systems) calibration equipment. The technician uses a diagnostic scanner and a set of precisely placed radar reflectors to aim the sensor. 🎬 Watch: How professional blind spot radar calibration is performed This ensures the radar is monitoring the correct zone and will not cause false alerts or fail to detect a vehicle.
Pro Tip: If your BSI system failed after a minor collision, even if the bumper was repaired, the radar unit itself was likely damaged or knocked out of alignment. The body shop's repair invoice should include a line item for radar calibration; if it doesn't, the system was likely not aimed correctly and will not function.
Cost Comparison
The mandatory calibration cost significantly impacts the total repair price. Always get a quote for both the part and the calibration labor.
| Part/Service | Estimated Cost |
|---|---|
| New OEM Radar Unit | $710 - $1,075 |
| Used OEM Radar Unit | $150 - $350 |
| Shop Labor (Replacement) | $150 - $250 (approx. 1-2 hours) |
| Shop Labor (Calibration/Aiming) | $300 - $500 |
Frequently Asked Questions (FAQ)
Can I replace the blind spot radar myself?
You can perform the physical installation, which involves removing the bumper and swapping the unit. However, you cannot complete the job yourself. The system will not work until it is professionally calibrated by a dealer or ADAS-certified shop, so you must plan for that visit.
What is blind spot radar calibration or aiming?
Calibration, or aiming, is a process that tells the radar sensor its exact position and angle relative to the vehicle's centerline. A technician uses specialized targets and Honda's diagnostic software to perform this alignment. Without it, the sensor won't know where to look, making the BSI and Cross Traffic Monitor systems inoperable or dangerously inaccurate.
Why did my blind spot system fail if my bumper isn't damaged?
The radar units are sensitive. A minor impact can damage the internal electronics or knock the sensor's alignment off without causing visible damage to the bumper cover. Other causes include water intrusion into the wiring connector or simple internal failure of the electronic components over time.
Is it safe to drive with the "Blind Spot Info System Problem" warning on?
Yes, the truck is safe to drive. The warning simply means that the Blind Spot Information and Cross Traffic Monitor safety features are turned off. You will need to rely on your mirrors and check over your shoulder when changing lanes or backing up.
Helpful Videos
Technical Specifications
OEM Part Numbers: 36931-T6Z-A12 36931T6ZA12 36931-T6Z-A11 36930T6ZA02
Right (Passenger) Side Blind Spot Information (BSI) Radar Unit. Operates on a specific radio frequency for vehicle detection.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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