Collision Avoidance - Back-Up Sensor Troubleshooting
Back-up Sensor System: How It Works and How to Troubleshoot ItNOTE:
This article applies to '03-06 MDXs, '05-06 RLs, and '04-06 TLs.
You've probably noticed a number of newer Acura vehicles are sporting a back-up sensor system. When you're backing up, the system beeps to let you know your rear bumper is coming up on an obstacle.
This system-available as an accessory kit on all applicable models-is designed to come on as soon as you shift into reverse with the back-up sensor switch on. The four sensors in the rear bumper send out ultrasonic waves that reflect back from solid objects. The system figures out the distance from an object by measuring the time difference of the reflected wave.
The sort of beeps you hear from the back-up sensor system depend on just how close you are to the object and which of the sensors are doing the detecting. Here's the lowdown for all applicable models:
If you're hearing a series of two, three, or four beeps, it means the back-up sensor system has a problem. Here's what those beeps are telling you:
You can check the status of the back-up sensor system with this simple procedure:
1. Start the engine.
2. Apply the parking brake, press the brake pedal, and shift into reverse.
^ If you hear a 1-second beep, the system is OK.
^ If you hear continuous beeping, or no beeping at all, the system has a problem. Very often a sensor that's covered with mud, ice, snow, etc. is the culprit. Use low pressure water to wash the sensors, and use a clean cloth to wipe them dry. If the sensors were already clean, then check for an open or short circuit. Keep in mind, any of the conditions below could also cause the back-up sensor system not to work right:
^ You're driving on a rough road, on grass, or on a hill.
^ You leave the vehicle out in hot or cold weather. If the sensors are exposed to temperatures below -4°F or above 122°F, they might not work.
^ You're driving in bad weather.
^ The electrical system is affected by some electrical equipment or a device that generates an ultrasonic wave.