Order of execution
1. With the needle of a test lamp, you can pierce the insulation of the wire and determine which wire has voltage.
2. Locate the wiring diagram for each switch.
3. First, it is checked whether voltage is supplied to the switch at all; in this case, you need to turn on the ignition or lighting several times.
4. Then it is checked whether there is continuity in the switch in the corresponding position.
5. Using the ignition switch assembly as an example, it looks like this:
6. Remove the top and bottom trim of the steering column as described in the section on dismantling the lever switches in this chapter above.
7. Connect a connecting wire of a control lamp to weight.
8. Pierce the insulation of the wire under test with the test tip.
9. Both terminals 30 of the thick red wire must always be powered by the battery.
10. Grey/yellow wire of terminal P in position «Ruhestellung» (rest) the ignition switch is energized and is de-energized when it is turned.
11. Black/yellow wire terminal X (as well as terminals 75) is energized only in the key position «Zundung ein» (ignition on).
12. The thin red wire to terminal 86s is energized until the key is removed. This is where the radio is plugged in (for information) interior lighting delay relay and warning buzzer in the combined instrument panel.
13. Black wire terminal 15 receives voltage in the key position «Zundung ein» (ignition on) And «Anlassen» (engine starting).
14. Red / black wire from terminal 50 of the start signal to the starter is energized only in position «Anlassen» (engine starting)
15. Terminal 50b has the same function as terminal 50 to pre-excite the generator already during engine start.
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