There is no universal meaning for the digits 123 on an ignition switch. In most cases, the numbers refer to terminal designations or a model/revision code rather than a functional sequence like off, accessory, and start.
Markings vary by manufacturer and vehicle type. To know for sure, consult the service manual for your specific model, inspect the switch for accompanying part numbers, or contact the manufacturer or dealership with the exact make, model, and part information.
Likely explanations for the 123 marking
Here are common explanations you might encounter when you see 1-2-3 on an ignition switch.
- Terminal numbering: Many ignition switches have numbered terminals (1, 2, 3) for battery input, accessory circuits, and starter wiring; the numbers help indicate where wires connect.
- Model or revision code: Some switches are stamped with 1-2-3 to indicate a specific model, version, or production run used in different vehicles or assemblies.
- Lock cylinder alignment or orientation marks: In certain applications, 1-2-3 can serve as orientation marks to ensure the cylinder is installed correctly.
- Aftermarket or supplier labeling: Some aftermarket switches carry internal part numbers or supplier codes; 123 may not correspond to the vehicle's original wiring layout.
Concluding: While 123 can point to terminal IDs or a part code, its exact meaning varies by maker and application. Always verify with the official documentation for your switch.
How to determine the exact meaning for your vehicle
To confirm what 123 means on your switch, follow these steps.
- Identify the exact switch model by inspecting the housing or the cylinder for a part number, manufacturer name, or stamped code.
- Open the vehicle’s service manual or official wiring diagram for that switch model to see how terminals are labeled and wired.
- Inspect the wiring harness connector to locate terminal numbers and compare them to the diagram.
- If needed, contact the manufacturer or a dealership with the part number, vehicle VIN, and clear photos of the switch to verify the mapping.
Concluding: Confirming the precise meaning protects against miswiring and security issues, and helps ensure the ignition system functions safely and reliably.
Summary
In short, the digits 123 on an ignition switch typically indicate terminal IDs, a model or revision code, or alignment marks rather than a universal operation sequence. The exact meaning is model-specific, so consult the vehicle’s manual or the switch’s documentation to determine the correct interpretation for your particular vehicle.
What do the numbers mean on an ignition switch?
The number 15/54 or 15 indicates that `keyed' battery power goes to this terminal. The number 31 means that this point has to go to ground. The number 50 indicates the power line from the ignition switch to the starter solenoid trigger terminal.
What is the default pin for 123 ignition?
1234
Remember, the distributor has to be powered (6 or 12 volts). After that you will be prompted for a PIN-code, which is 1234 by default. After you have entered the PIN-Code a connection will be made. You can check whether a connection has been established by selecting the dashboard.
Which coil for 123 ignition?
For normally used cars we advise you to use the 123 Blue Coil. It may be better to use a 123 Red Coil for a rally car or other application where high revs are often driven. However, this last coil cannot be used if you want to drive with contact points.
How does 123 ignition work?
Altitude compensation: The 123ignition uses absolute pressure, (MAP or Manifold Absolute Pressure) to adjust the ignition timing. This compensates for thinner air (lower air pressure) at higher altitudes.