When you’re dealing with your BMW, particularly models around the 1995 S600 era, understanding key programming is crucial, especially after ECU reconnection. While the process detailed below doesn’t directly involve the “Bmw 95 S600 Pin To Obd2 Pinout” in terms of needing a specific pin configuration for this procedure, it’s helpful to know that modern vehicle diagnostics and some programming tasks often interface through the OBD2 port. This guide focuses on the key programming sequence for these systems, ensuring your vehicle recognizes your keys after an ECU reset or replacement.
Key Re-Programming Procedure After ECU Reconnection
After you have reconnected your Engine Control Unit (ECU) to your BMW, the system typically enters an auto-programming mode. This mode is designed to recognize and register new keys. Follow these steps carefully to program your keys successfully:
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Initial Key Insertion: Begin by inserting any key – it doesn’t have to be the key you intend to program – into the ignition lock cylinder. Turn the key briefly, just enough to register, and then remove it immediately. At this point, observe your dashboard. The security light should illuminate and remain continuously lit. This indicates that the system has entered the key programming mode.
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Programming the First Master Key: Now, take the first transponder key that you wish to designate as a master key. Insert this key into the ignition lock cylinder. Crucially, do not turn the ignition on. Keep the key inserted for approximately 3 to 5 seconds. During this time, you might see the security light blink. A blink often signifies that the system has successfully recognized and accepted the key. After the 3-5 second interval, remove the key from the ignition. The security light should remain continuously illuminated, confirming that you are still in the programming mode and ready to program subsequent keys.
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Programming the Second Master Key: Repeat the process with your second transponder key intended as a master. Insert it into the ignition lock cylinder without turning on the ignition. Again, leave it for 3 to 5 seconds. Look for the security light to blink, indicating acceptance. Remove the key after the interval. The security light should remain on, keeping you in programming mode.
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Programming the Valet Key: If you have a third key that you want to program as a valet key, insert it into the ignition lock cylinder, without turning the ignition on. This time, observe the security light. After inserting the third key, the security light should turn off. Once it goes off, remove the third key from the ignition. Following this, the security light should extinguish completely and then start to blink at regular intervals.
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Finalizing the Programming Cycle: Now, it’s important to wait. Allow approximately 30 seconds for the programming cycle to fully complete and for the programming mode to automatically close. Do not insert any keys or interact with the ignition during this 30-second period.
Key Designation: Master vs. Valet
After the programming cycle is complete, your keys will be designated as follows: The first two keys programmed using this procedure are internally recognized by the ECU as MASTER keys. The third key, if programmed, is designated as the VALET key.
Testing Your Programmed Keys
To ensure your keys have been programmed correctly, perform the following tests:
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Master Key Test: Insert one of the designated MASTER keys into the ignition. If the key is correctly programmed, the security light should stop blinking almost immediately as soon as you insert the key.
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Valet Key Test: Insert the VALET key into the ignition. If correctly programmed as a valet key, the security light will remain solid for approximately 2 seconds and then turn off.
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Unprogrammed Key Indication: If you insert a key, and the security light does not stop blinking, this indicates that the key has not been successfully programmed to your vehicle. In such cases, you may need to repeat the programming procedure or consult a professional.
While this procedure outlines the key programming process, understanding the broader context of your BMW’s systems, including the OBD2 port and potential pinouts for diagnostic purposes, can be beneficial for comprehensive vehicle maintenance and troubleshooting. However, for this specific key programming task, the above steps should be sufficient to get your keys recognized by your BMW’s ECU after reconnection.
