2022-2024 Honda Civic Back-Up Sensor Software Update

Owners of 2022-2024 Honda Civic Touring 4-door models may encounter a "back-up sensor system abnormal message" appearing in the multi-information display (MID) while reversing. This issue, addressed by Honda Service Bulletin 25-024, is particularly noticeable when backing up near chain link fences or highly reflective surfaces.

This service bulletin, 25-024, outlines a software update to correct the problem, ensuring the back-up sensor system functions as intended. The update is applicable to all VIN ranges for the specified models.

Symptoms

The primary symptom owners will notice is a specific warning message displayed on the multi-information display (MID). This message, stating "back-up sensor system abnormal message", occurs under certain conditions when the vehicle is reversing. It is most commonly triggered when the vehicle is near objects that cause multiple reflections, such as chain link fences or other highly reflective surfaces.

Possible Cause

The root cause of the "back-up sensor system abnormal message" is identified as a memory overload within the back-up sensor system. When the sensors detect a large number of reflected waves, the increased processing load can overwhelm the sensor's memory, leading to the abnormal message. This is why the Honda Civic back-up sensor issue often appears in specific environments.

Fault Codes / DTCs

While the bulletin does not list specific diagnostic trouble codes (DTCs) in the Pxxxx format, it references a Defect Code 03214 and a Symptom Code 03217 for warranty claims. The corrective action involves clearing any existing DTCs before and after the software update to ensure a clean system state.

Important Warnings

Honda has issued several critical warnings for technicians and owners regarding this software update:

• VCI Compatibility: Do not use the MongoosePRO VCI for this service bulletin, as it is not an American Honda-approved device for this procedure.
• Power Supply: Do not use a lithium-ion jump pack to supply power during the update. Lithium-ion jump packs can deliver pulses of high amperage that do not provide consistent power, potentially causing control module failure. Control module failures resulting from improper software update completion (e.g., early key cycle, low battery voltage, disconnected DLC cable) are not covered under warranty.
• Interruption During Update: If an error occurs during the update or if the i-HDS diagnostic tool freezes, do not disconnect the battery or turn the ignition to OFF. Instead, reboot the i-HDS and restart the procedure.
• Electrical Operation: To prevent damage to the control unit, do not operate any electrical components (such as headlights, audio system, brakes, A/C, power windows, or door locks) during the software update process.
• Warranty for Routine Checks: Warranty reimbursement for technician labor is not provided for routine checking or installation of generally available software updates.

Repair Procedure Summary

The repair for the Honda Civic back-up sensor issue involves a software update to the parking and back-up sensor system. The procedure, as outlined in Honda Service Bulletin 25-024, includes the following steps:

1. Initial DTC Check and Clear: Technicians must perform an ALL DTC CHECK to identify any existing codes. These codes should be noted, and then an ALL DTC Clear must be performed to clear all diagnostic trouble codes.
2. Software Update: The PGM-FI software is updated using the ECU Reprogramming Application with the DST-i. This step specifically targets the parking and back-up sensor system software. Technicians are advised to refer to service bulletin 22-100, "Updating Control Units/Modules with the ECU Reprogramming Application," for detailed instructions on updating vehicle systems.
3. Final DTC Check and Clear: After the software update is complete, another ALL DTC CHECK is performed to clear any new codes that may have been set during the update process.

It is crucial that the 12-volt battery is fully charged before starting the update and remains connected to a steady power supply (like a Midtronics GR8-110P AST or similar approved device) throughout the entire procedure.

Required Tools or Parts

To perform the software update for the Honda Civic back-up sensor system, specific tools and software versions are required:

• Diagnostic Tools: i-HDS and a Honda-approved VCI (Vehicle Communication Interface).
• Battery Charger/Power Supply: Midtronics GR8-110P AST (in Power Supply Mode), Midtronics DCA8-8000 Dynamic Diagnostic Charging System (in Reflash Mode), or Associated Equipment Corporation ESS 6100 100A Smart Charge (in Power Supply Mode | DIAG+).
• Software Versions (or later):
  • i-HDS Software Version: 1.010.011
  • HDS Software Version: 3.105.036
  • Honda ECU Reprogramming: 4.7.0.0
• Program ID: 39673-T20-A070
• Failed Part Number (for warranty claim): 39670-T20-A06

Owner Action

If your 2022-2024 Honda Civic Touring 4-door is displaying a "back-up sensor system abnormal message" when reversing, you should contact an authorized Honda automobile dealer. They have the necessary tools, equipment, and trained technicians to perform the software update as described in Service Bulletin 25-024. This update is typically covered under warranty.

NHTSA ID: 11014326