Key sensor in ignition switch

Hi,

That's a tough one. The security control unit is behind the radio which has nothing to do with this. Next, there is a sensor in the key switch which sends a signal to the control unit to enable the engine to start. When you had the repairs done, was the tumbler replaced as well as a new key? Was there ever an issue like this prior to the repairs (before the tumbler broke)?

The idea that you have to push the key with force to get the light to turn off honestly sounds like a bad lock cylinder.

Let me know.

Joe

Hello Joe!

Glad to receive your kind and expert reply, the work on the existing ignition switch was the replacement of the spring loaded pins in the tumbler which the key puts in the position that allows turning, like in all cylinder locks.

There was no issue with the green key light at all before the cylinder locked up as I was leaving the supermarket in mid '19; the car locksmith came and helped remove the lock in order to start the car, move the steering wheel and take it home, in the same neighborhood.

He then removed the cylinder, took it to his shop, proceeded to replace the worn pins, came back the next day and re-installed it, the car could be started again. The troubles with the key sensor started a few days later, the blinking light would not stop until removing the key, putting it back, pushing, holding then turning, etc, several times until the green light is off and the car can be started.

Have the two original keys that came with the vehicle.

Very best wishes, continue to have a nice Christmas season, and a Happy New Year.

Bobby

Hello again Joe, check the attached pictures of the ignition switch key sensor, the Honda part number is 39730-S04-G0.

Bobby

Hi,

Did he reuse the old tumbler and just replace the pins?

Hello Joe,

Thank you again for your kind reply and sharing your technical expertise.

Yes, the locksmith reused old tumbler, replacing the worn pins.

Does changing the tumbler mean having to change all the locks in the car?

The key sensor coil or ring is what detects the key, correct? Why would a mechanical tumbler make the light stay blinking?

Best wishes

Bobby

Hi, Bobby.

No, there is no need to change all the locks. As far as the tumbler, what he did shouldn't have affected anything. However, something have gone back together differently. Have you spoken with the person that repaired it?

Take care,
Joe

Hello Joe,

Thank you again for your answers, talked to the locksmith again, he agrees that the mechanical repairs to the lock cylinder pins should not affect the electronic key sensor, he suggested cleaning the contacts. It's a small plastic plug, will try tomorrow to unplug, plug again which I have already done so.

If the sensor is replaced, do you know if this requires reprogramming the keys, computer, etc? -Am looking for the replacement Honda Part # 39730-S04-G0.

Best wishes,

Bobby

Hi,

Try cleaning to see if that does anything. However, if you already have, it shouldn't be an issue. As far as replacement, to the best of my knowledge, it will need reprogrammed. You really don't need to get a Honda part, but in all honesty, I suggest it. Otherwise, you'll most likely end up with crazy issues.

Let me know if I can help in any way.

Take care and wishing you a good new year.

Joe