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My dome light does not turn on when doors are opened.
Remote central locking does not work.
Rear fog light does not work.
Slow speed wiper setting does not work.
Trunk lock does not work.
Engine management light permanently on.
Hand break light permanently on.
Immobiliser key flashing.
Regrding replacement MICU should I look for unit from similar car. Should I look for one from 4 door variant etc? Or any old would do?
Recently, I managed to get used to MICU and fit it. Happy to report that the dome light, central locking, wiper interval, hand break indicator ect is now working fine. The only issue is that the power to the driver's door is not cut off when the key is not in the ignition. Therefore, it is possible to open and close the window. So massive thank you Ryanthegreat1! I thought that I will open the old MICU and post the picture.
The three tiny 8-pin ICs are as follows IS93C46-3 1024-bit memory IC, 3793-A Power voltage monitor, and 7W00F Clock generator. I am a bit worried about the IS93C46-3 1024-bit memory IC as if it stores the serial number it could make syncing the immobiliser more difficult. So currently I am in a situation where ECU's EEPROM-L56R-93c56 is unsoldered. What is worse due to storage or unsoldering the part is damaged. The content is gone. How could I go about syncing the keys, immobiliser unit and ECU? I could not find a "verging" hex file that would allow me to program the keys I already have using the ignition.
Thanks! I have looked at it and it is a bit pricy or I have to wait for it to arrive from far east. I will look for a local technician and ask for a quote. Considering I also have an ABS issue perhaps I could get that diagnosed at the same time.
I was thinking of this one as it is out of a box solution with everything included. https://www.obd2shop.co.uk/wholesale...RoCuJEQAvD_BwE
There are cheaper options that include a diagnostic port to USB cable only.
Thank you for pointing out the software issue. Well, I looked at Foxwell on the official website as well as on Amazon and eBay. There are NT510 elite and NT630 pro at good prices in both cases the seller confirmed that it can deal with both ABS and immobilizer. Bit stuck between two. What would be the spec/ability worth considering taking into account that both can support vehicles of interest?
Quick update. I fitted a new MICU. During installation, I noticed that MICU also has EEPROM (93c46) and ignored it for time being. With the new MICU fitted car drives fine apart from the engine management light being on and the immo key flashing as well as the remote central locking not working. I also tested EEPROM removed from ECU (93c56) with the new EEPROM reader and it turns out it is not damaged (initially I thought it was). As soon as I fitted the original ECU EEPROM the car will not start (immo key flashing). This leads me to the suspicion that MICU is also serialised hence EEPROM on the MICU board (93c46). This could explain why with all original parts apart from MICU the car does not start. I intend to swap the MICU EEPROM from my old MICU to the new one.
I suspected it. I will swap the MICU EEPROM from the original MICU to the new one and hopefully, it will work. For my information where else is the serial code stored does the immobiliser has a separate EEPROM?
Not sure about the antenna as in another car I have swapped the ignition barrel to a new one. The ignition barrel has a built-in antenna same as in Honda. After the swap all was fine. Antena is usually connected to an amplifier and some sort of ADC and this board might have EEPROM. I hope that the key reader board is fine and does not require swapping.
At least in the later Hondas the antenna is serialized.
From what I gather the antenna stores the knowledge of the keys. When doing immobilizer work with an HDS you can do a PCM or MICU replacement without all keys. But if you replace the amring around the ignition switch you need all keys to program them all back in.
Just thought I'd add this info about MICU not working. I searched for info on how to test MICU on my 2002 Honda Civic EX 1.7, A/T, 4 door, and the first two things it said to check was #9 (10amp) back up lamp fuse in under hood fuse box and also #10 (7.5amp) Meter or ( gauge) fuse in under dash fuse box. My back up lamp fuse was blown which caused my MICU to not function properly, no door lock control, dome light fader not working, a/c not working, brake light on, and no immobilizer green key light on my instrument cluster.
My #10 (7.5amp) meter fuse was still good.
After replacing the #9 (10amp) back up lamp fuse, my MICU started working again, all MICU controlled functions started working again.
I looked at the MICU schematic and the both of these fuses run directly to the MICU. Not sure why the back up lamp circuit failure would cause the MICU to malfunction, but it does.
Just thought this info might help someone have issues with MICU, immobilizer and no start conditions.
Just thought I'd add this info about MICU not working. I searched for info on how to test MICU on my 2002 Honda Civic EX 1.7, A/T, 4 door, and the first two things it said to check was #9 (10amp) back up lamp fuse in under hood fuse box and also #10 (7.5amp) Meter or ( gauge) fuse in under dash fuse box. My back up lamp fuse was blown which caused my MICU to not function properly, no door lock control, dome light fader not working, a/c not working, brake light on, and no immobilizer green key light on my instrument cluster.
My #10 (7.5amp) meter fuse was still good.
After replacing the #9 (10amp) back up lamp fuse, my MICU started working again, all MICU controlled functions started working again.
I looked at the MICU schematic and the both of these fuses run directly to the MICU. Not sure why the back up lamp circuit failure would cause the MICU to malfunction, but it does.
Just thought this info might help someone have issues with MICU, immobilizer and no start conditions.
Under-hood Fuse No. 9 (10A) is called the back up fuse; but it is not the fuse for the "back up lamp".
Fuse No. 9 protects the following components or circuits:
Audio unit, CarLink interface box connector, DLC, Gauge
assembly, Immobilizer control unit-receiver, Keyless receiver unit
(’04-’05: DX, LX; EX), Multiplex control unit, Security control unit
TECH8, Woops, my bad, guess I didn't research it deep enough, was just glad to see it working again, lol.
It's been a long day. I appreciate the info, 👍👌🤙.
Always good to learn something new.
Well, now all I have to do to it is put a set of plug coils on it and rebuild the head, piece of cake, lol.
Take care , Coupe88
11-26-2021, 11:33 AM
Re: Faulty immobiliser Honda civic 2002.
