The chip automatically deactivates the immobilizer if a valid vehicle key is inserted into the ignition lock. You may also see a warning light with key symbol or key not detected message in the instrument cluster. A fault in the immobilizer system can prevent your Odyssey from being started. The immobilizer is an anti-theft security system that prevents the engine from being started and the vehicle from being moved with an unauthorized vehicle key.

In these cases an OBDII scan tool can be used to verify if the commands are being transmitted and acted on by the security module. The keyless entry antenna could be damaged, or the module is just not communicating with other modules on the vehicle. You may have to perform further diagnostics to identify the faulty. If none of your key fobs work, and and you can’t reprogram the keys, it is possible the receiver module has developed a fault. Honda Odyssey has a remote keyless system receiver that receives radio frequency signals from the key fob. battery replacement, reprogramming and the spare key fob works. Or, if your key fob just stopped working one day out of the blue, in rare cases this could indicate a faulty key fob – assuming you have tried everything to fix the issue e.g. If your Odyssey key fob stopped working after you dropped it on the floor, you may have damaged the internal chip. If you fail to do it yourself, you may have to visit an authorized dealer for reprogramming of the key. The instructions should be mentioned in the owners manual. You may also be able to program a key by following a few steps, an original key is typically required for successful pairing.

The key can be reprogrammed with an OBDII scanner. In rare cases, the remote key of Odyssey may stop working due to pairing issues. Your Odyssey key fob should start working again when you leave the area of interference. A large part of the radio interference is caused by defects and aging effects in electrical devices and radio systems, which lead to unwanted emissions, radiation and repercussions on power and communication networks. Interference signals can be caused not only by neighboring radio masts and towers, but also by unprofessionally installed satellite systems. In case of severe interference, the remote may not work at all. The remote key may work when you’re near the vehicle, but may not work from a distance. Odyssey remote control signal can be disrupted by objects, poor weather conditions or transmitters on the same frequency band close to the vehicle. If the 12 volt battery is dead or if the electric current has been interrupted due to corrosion on the battery terminals or the ground connection, all on-board electronics will stop working. The remote keyless system and the central locking system in Odyssey require the 12 volt battery to be in healthy state to function properly. If the key fob still doesn’t work after cleaning and drying, the chip is probably fried and you will have to buy a new key. In case of exposure to salt water, or soapy or dirty water, it is recommended to clean the chip with isopropyl alcohol or electronic cleaner.

If your Odyssey key fob stopping working after exposure to clean tap water or rain, immediately remove the battery and clean the electronic component with paper towel and let it dry fully before putting back the battery. Exposure to excessive water increases the risk of water damage, so you shouldn’t make this a habit.

If your Odyssey key fob survived a wash cycle, or a deep bath in the ocean or pool water, it doesn’t make the key fob waterproof, it means you got lucky. Submerging the key in ocean water at the beach can be much more damaging to key fob electronics due to highly conductive nature of salt water. A splash of water or brief exposure to light rain should be fine, but exposure to excessive amount of water like submerging the key in the pool can cause the water to penetrate the seals and damage the chip. Your Odyssey key has rubber seals which prevents the water from getting to the electronic chip inside. If your Honda Odyssey key fob has taken a bath in the soapy water of the washing machine after you forgot to take it out of your pants pocket, water damage is very likely. Also make sure all the battery contacts are corrosion and dust free. Make sure the battery is firmly placed and does not move around when you shake the remote. If the clips don’t have any tension, it can cause contact issues and the remote may not receive any power. The battery inside the key fob of Odyssey has metal retaining clips that hold the battery in position and completes the circuit. This is assuming the new battery you installed is healthy and its use by date is many years away. Depending on how often you use the key fob or remote control of your Odyssey, the battery should last between two and four years.

2019 honda odyssey key fob battery