Honda Immobilizer issues

Tyler Technician Nova Scotia Posted   Latest  
Resolved
Security
2008 Honda Civic Si 2.0L (K20Z3) 6-spd — 2HGFG215X8H101678

Hey Guys

I have a 08 Civic si that has an immobilizer/key issue. Customer states the parked it and the next morning it would not start. Green immo light is flashing with key on. They towed to the dealership and got a new key programmed as the original key was in bad shape had been giving them issues. Dealer supposedly programmed the key and told the customer it would need a new dash harness. 

Customer had it towed here for second opinion. The only problem I can see with the dash harness was someone has cut one of the plugs off for clock spring. Customer says it was this way when he purchased the vehicle.

Tested all circuits to immobilizer k can, s can is present at immobilizer. Power and ground load test fine. Replaced the immobilizer with a used part of same part number and was able to do immo replacement procedure but it fails to register the key. Now it seems it is locked out and it states "immobilizer system not normal" and seems to have locked me out of any immo functions on the scan tool. 

Any help is appreciated on this one. 

Thanks 

Tyler

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Jorge Mechanic
New York
Jorge
 

Can I ask what scanner you are using for this? Did you try all keys lost? PCM replacement option?

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Tyler Technician
Nova Scotia
Tyler
 

Snap on verus edge. I have had good luck doing honda keys in the past with it. Local locksmith tried a couple different tools with same result.

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Tyler Technician
Nova Scotia
Tyler
 

I have tried pcm replace. Have not tried all keys lost though…

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Jorge Mechanic
New York
Jorge
 

If nothing works, check MICU. Make sure no connectors are semi plugged. Same with immo. Always try all the options in immo. This happen to me as well

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Arsalan Mechanic
District of Columbia
Arsalan
 

It should give you a code in either PCM or IMMO?

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Tyler Technician
Nova Scotia
Tyler
 

No codes related to immo in either

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Gevele Technician
Pennsylvania
Gevele
 

Pull out all wire diagrams from pcm to immo unit , bcm , and all data lines with modules, do full code scan I had the same issue with a crashed car… original key worked , bodyshop lost that key and upon making a key, dealer or aftermarket locksmith always failed at key programming…

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Paul Owner/Technician
California
Paul
   

I think you'll need an HDS. If the immobilizer system is “not normal”, then there's an immobilizer code in the “immobilizer info” section of the HDS. If the system is normal, there'll be a code N-1. There are other letter dash number codes that will describe the fault if N-1 isn't present. You could try some other tools and maybe you'll have some luck with those. Autel or AutoProPad maybe.

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Helpful
Rudy Technician
Utah
Rudy
 

I agree with Paul, there will definitely be a code in the immobilizer info section. Autel also has this section available. I used it to trouble shoot a fault on a 2008 CR-V

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Darin Engineer
Ohio
Darin
 

Admittedly this may be far off-topic, but I had an Acura recently that suffered some no-starts, and I originally thought it might be related to the immobilizer because the green light was flashing. In the end, an intermittent ground between a transaxle ground bracket and the transaxle was the problem.

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Helpful
Sujesh Owner/Technician
Georgia
Sujesh
 

I have a 2007 Civic Si here now that WAS a crank, no start. That has Immo light flashing and Immobilizer says system not normal with my Autel ms906BT. I did all keys lost function on the original key and that got the car running been fine ever since.

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Tyler Technician
Nova Scotia
Tyler
 

This is the only function I have not tried. I will update when I get a chance to get back on the cars. Thanks everyone

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Tyler Technician
Nova Scotia
Tyler Update
 

Update. Finally got back to the vehicle. With the new key from the dealer. when I try to preform the system check it states immobilizer system cancelled. This is why it will not let me preform any functions. With the original busted key. It allows me to do a system check and I get Code A-3. The Honda code chart states- -The ignition switch was turned ON (II) with a non-immobilizer key -…

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Paul Owner/Technician
California
Paul
   

It's certainly possible. Do you have a transponder key reader to check the key? What type of chip? If not, what's the Honda part number for the key? I know some of the Honda Fits and S2000 have an oddball chip. The same might be true of the Si. Edit: According to the VIN, it should be a 35111-SVA-306 key, which should have a regular Phillips 46 chip.

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Tyler Technician
Nova Scotia
Tyler Resolution
 

Well guys this ones fixed. Not because of my skillset but pure shit ass luck. I dropped something on the floor and bent down to pick it up and noticed a harness hanging down in the left front wheel well. The inner fender was missing and the harness was not secured. It had rubbed on the tire and wore down two wires a lt green and a pink. I suspect the pink was the s-net circuit between immo…

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