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[Solved] Opel Astra G - replacement of the ignition switch, key to the central locking

biedrek1 13383 13
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  • #1 16875243
    biedrek1
    Level 14  
    Posts: 312
    Rate: 44
    Hello.
    In the 2001 astra, the ignition switch broke - the metal pin broke and the car did not start. I bought a used ignition switch sleeve, with a key. After replacing the element, the car starts. Only the metal part was replaced, the ignition cube was the same. The problem is that the "new" key to start the car does not enter the car door locks - so you need to use 2 keys (1 for the door and 1 for the ignition switch). The car has a factory central locking - the key has two buttons to open / close the door.
    Unfortunately, the central lock, for unknown reasons, often jams - only closing, for example, and pressing the opening button does not do anything. Sometimes it is ok for a long time, and sometimes the lock does not respond to any button. That's why I can't count on buttons alone and would like to be able to open the door with a key.

    Another question is the question of what could be the reason for such a strange behavior of the central locking - it sometimes reacts to the remote control and sometimes not.
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  • #2 16875434
    bubu1769
    Level 43  
    Posts: 8039
    Help: 1173
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    As for the mechanical issue, I would transfer all the latches from the old cylinder to the new one and then it will work with the old key, but when it comes to the central one, does the diode on the remote control light up when pressing the button?
  • #3 16875913
    biedrek1
    Level 14  
    Posts: 312
    Rate: 44
    Is it possible to disassemble this sleeve so as to translate the guts and will the old key fit? Yes, after pressing the button the red LED lights

    I checked the battery with a measuring device - 3.05 V
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  • #4 16876201
    oktawian89
    Level 27  
    Posts: 1042
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    Sure it can.
  • #5 16876366
    bubu1769
    Level 43  
    Posts: 8039
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    You would have to check if the limit switches in the driver's door lock are not working.
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  • #6 16876530
    biedrek1
    Level 14  
    Posts: 312
    Rate: 44
    The matter was complicated - because I could not cope with the replacement of elements. I went to a specialist who put everything together on one key - this old key. By the way, he also repaired the key because it turned out that one plate inside was chipped and that is why the pilot sometimes caught and sometimes did not.

    The only problem left - the airbag indicator light is on, I took it off and pressed the connector but it doesn't work. After turning the key, it is on all the time, after turning on the engine, it disappears for a second and comes back, OBD connected to the car does not detect any errors.
  • #7 16876776
    bubu1769
    Level 43  
    Posts: 8039
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    What OBD? You must have at least an OP-COM for the diagnosis of the pillow. The ankles under the seats often loosen.
  • #8 16877404
    biedrek1
    Level 14  
    Posts: 312
    Rate: 44
    No, I have OBD for 20 zlotys .... :) After the weekend, I have to show up at a car repair shop. I moved the ankle under the seat, pressed it, etc. No changes. I wonder if this light is on, will the pillow work if necessary?
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  • #9 16877434
    Strumien swiadomosci swia
    Level 43  
    Posts: 27411
    Help: 1403
    Rate: 6379
    biedrek1 wrote:
    I wonder if this light is on, will the pillow work if necessary?

    No, because that's what shines in to inform you about a malfunction.
  • #10 16877444
    biedrek1
    Level 14  
    Posts: 312
    Rate: 44
    Well, as soon as possible to professionals. I hope I'll be able to squeeze somewhere on Monday
  • #11 16877628
    bubu1769
    Level 43  
    Posts: 8039
    Help: 1173
    Rate: 2342
    Even with a glowing indicator light, the pillows should work if necessary. The pillow error will not go out by itself, even if there is currently no fault, you have to connect the computer and delete it each time. For me, the error appeared once when I killed a fly on the dashboard, and as long as I did not delete the errors, the light was on. Anyway, to find out what caused the appearance of the light, you need to connect and read the saved errors.
  • #12 16878370
    Meteo33
    Level 17  
    Posts: 319
    Help: 12
    Rate: 83
    The only problem left - the airbag indicator light is on, I took it off and pressed the connector but it doesn't work. After turning the key, it is on all the time, after turning on the engine, it disappears for a second and comes back, OBD connected to the car does not detect any errors. [/ Quote]

    The reason may be, for example, the position sensor cable, and not the pillow itself. It is enough to drive through the holes or move the chair to light up the light.
  • #13 17898988
    biedrek1
    Level 14  
    Posts: 312
    Rate: 44
    The friend was right - after cleaning the contacts, the problem disappeared
  • #14 17898989
    biedrek1
    Level 14  
    Posts: 312
    Rate: 44
    The friend was right - after cleaning the contacts, the problem disappeared

    Added after 31 [seconds]:

    Replacing the ignition switch, cleaning the wires

Topic summary

✨ The discussion revolves around the replacement of the ignition switch in a 2001 Opel Astra G, where the user faced issues with a new key that does not fit the door locks, necessitating the use of two separate keys. The user also reported problems with the factory central locking system, which intermittently fails to respond to the remote control. Suggestions included transferring latches from the old cylinder to the new one to ensure compatibility with the original key and checking the limit switches in the driver's door lock. The user later sought professional help to unify the keys and repair the remote, which had internal damage. Additionally, an airbag indicator light issue was raised, with advice to use a proper OBD tool for diagnostics and to check connections under the seats. Cleaning contacts resolved the airbag light problem.
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FAQ

TL;DR: In a 2001 Astra G, a 3.05 V key battery still showed intermittent remote; "Sure it can."—the lock core can be rebuilt to keep one key. [Elektroda, oktawian89, post #16876201]

Why it matters: This FAQ helps Astra G owners fix ignition/central locking mismatches and an airbag light without chasing dead ends.

Quick-Facts

Quick Facts

How do I keep one key after replacing the Astra G ignition switch?

Move the old cylinder’s latches/wafers into the replacement sleeve. The ignition will then work with your original door key. This mechanical rekey avoids carrying two keys and preserves central locking convenience. A locksmith or experienced DIYer can do it with care. "Transfer all the latches from the old cylinder to the new one." [Elektroda, bubu1769, post #16875434]

My remote’s LED lights but range is flaky—what should I check first?

Verify the key battery voltage and inspect the remote PCB for cracked solder or chipped components. In the case discussed, the battery measured 3.05 V, yet a damaged internal plate caused intermittent response. Reflow or replace damaged parts after testing. [Elektroda, biedrek1, post #16875913]

Why does my central locking sometimes close but not open?

Faulty limit/microswitches in the driver’s door lock can confuse the control logic. The car may register only one direction and ignore the other. Inspect, clean, and test the switches; replace the lock module if wear is evident. [Elektroda, bubu1769, post #16876366]

Can the replacement ignition sleeve be disassembled to swap the guts?

Yes. The replacement sleeve can be disassembled so you can transplant the internals and match your original key. This enables a one-key solution for doors and ignition after the metal pin failure. [Elektroda, oktawian89, post #16876201]

Which diagnostic tool reads Astra G airbag (SRS) faults correctly?

Use OP-COM or equivalent capable of SRS modules. Cheap generic OBD readers often won’t see airbag codes. Read, fix the cause, then clear stored faults after repair. [Elektroda, bubu1769, post #16876776]

Airbag light on: does the system still work?

Treat an illuminated SRS lamp as a malfunction indicator. Do not assume airbags will deploy. Schedule diagnostics and repair before driving further. "That’s what it shines to inform you about a malfunction." [Elektroda, Strumien swiadomosci swia, post #16877434]

What common cause triggers the Astra G airbag light after seat movement?

Loose or oxidized connectors under the front seats often trigger the SRS lamp. Movement or bumps can worsen contact issues. Reseat and clean the connectors, then clear the stored fault with proper equipment. [Elektroda, bubu1769, post #16876776]

What actually fixed the intermittent remote and SRS light in this case?

Cleaning electrical contacts/connectors resolved the issues. After cleaning, the poster reported the problem disappeared. Good contact hygiene can restore both remote reliability and SRS integrity. [Elektroda, biedrek1, post #17898988]

How do I diagnose intermittent central locking in three quick steps?

  1. Verify remote battery voltage and LED response.
  2. Inspect driver-door lock limit switches for wear and contamination.
  3. Clean connectors and retest; replace the lock module if faults persist. [Elektroda, bubu1769, post #16876366]

My OBD scanner shows no errors, but the airbag light stays on—why?

Generic OBD tools often can’t access SRS. The light can persist even with no powertrain codes. Use OP-COM to read and clear SRS faults after you fix the wiring or connector issue. [Elektroda, bubu1769, post #16876776]

Edge case: the light briefly goes out after startup, then returns—what does that mean?

The SRS controller runs a self-test at key-on. A momentary extinguish followed by re-illumination points to a stored or intermittent fault. Inspect under-seat connectors and clear codes after repair. [Elektroda, biedrek1, post #16876530]

What’s the simplest reliability upgrade after rekeying the ignition?

Have a specialist inspect and repair the key fob PCB for cracked plates or joints. In the discussed case, fixing a chipped plate restored consistent remote operation. [Elektroda, biedrek1, post #16876530]
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