Immobilizer problems

Tiny
DUCMAN13
  • MEMBER
  • 2000 HONDA CIVIC
  • 4 CYL
  • FWD
  • MANUAL
  • 60,000 MILES
Hi there.I have a honda civic 1.4 2000 model and today my car won't just start. It cranks the engine but nothing else happens. The green key led is flashing. This happened after leaving the car for 2 days under lots of humidity. Any ideas? Thanks in advance
Monday, December 21st, 2009 AT 11:37 AM

14 Replies

Tiny
KHLOW2008
  • MECHANIC
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Hi ducman13,

When the green key is fladshing, the security system is armed.

Did you try disarming the system by locking and unlocking the doors with the key?
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Tuesday, December 22nd, 2009 AT 11:16 AM
Tiny
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Yes done that. Also tried both my keys. Also tried to lock and unlock the doors from inside with the key on. But no luck
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Saturday, December 26th, 2009 AT 3:20 PM
Tiny
KHLOW2008
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The PCM is not reading the key correctly and under such circumstances, you would have to reprogram the keys to get them to work correctly.

Guess you would have to contact the dealer to perform that.
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Sunday, December 27th, 2009 AT 12:21 AM
Tiny
DUCMAN13
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Was thinking that maybe its because of humidity. Cause i've left the car not working for 3 days under much humidity. Everything was so moist inside when I tried to start it. Do you think I have to change the immobiliser controller?Cause I cant think both keys not working.
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Sunday, December 27th, 2009 AT 5:30 AM
Tiny
KHLOW2008
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Humidity is the worst enemy of control units and maybe you can try removing the PCM to dry it out to see if it helps.

If corrosion/oxidation had taken place due to the humidity over a period of time, then you might have to replace the control unit. Only a test would be able to determine if it is necessary.
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Sunday, December 27th, 2009 AT 6:16 AM
Tiny
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I have no idea where PCM is located though.
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Sunday, December 27th, 2009 AT 12:08 PM
Tiny
KHLOW2008
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PCM is located behind the right kick panel.


https://www.2carpros.com/forum/automotive_pictures/192750_ECMLocation00CivicFig10_1.jpg

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Sunday, December 27th, 2009 AT 1:47 PM
Tiny
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Wow. Fast reply. Thanks you very much for that.I've also managed to download a service manual, maybe it will help me too. Couldn't find anything about my green key light flashing though in it.I will try to remove the pcm and dry it and see what happens. Will let you know. Thanks for the help so far though.
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Sunday, December 27th, 2009 AT 3:10 PM
Tiny
KHLOW2008
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I was browsing through the alarm system indformation and there are diagnostic procedures.

Is your model CX, DX, EX etc? They have different security systems.
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Monday, December 28th, 2009 AT 5:40 AM
Tiny
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I dont really know.I have to check on the car to see which it is. It says 1, 4iS on the back. Will check and let you know
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Monday, December 28th, 2009 AT 6:40 AM
Tiny
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1.4iS? Are you located in the US or UK?

Wiring might be different so we might need to check through all of them.
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Monday, December 28th, 2009 AT 9:05 AM
Tiny
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In greece. But I brought the car from italy
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Monday, December 28th, 2009 AT 2:35 PM
Tiny
KHLOW2008
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The data that I have are for American models so they might not be the same.

Have you checked all the fuses? A blown fuse can cause the security system to stay armed.

Is vehicle equipped with a valet switch for the security system?
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Tuesday, December 29th, 2009 AT 6:54 AM
Tiny
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Should I check the fuses under the hood?
I dont know what a valet switch is.
I also found in another forum just that sometimes fuse nr 9 under hood is responsible for the alarm system. Should I check this?
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Tuesday, December 29th, 2009 AT 7:55 AM

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