Find the correct wiring diagram for each switch.
First, it is checked whether voltage is supplied to the switch at all; for these purposes, you need to turn on the ignition or lighting.
It is then checked whether the switch supplies voltage in the appropriate position.
Using the ignition/start switch as an example, this looks like this:
Dismantle facing of a steering column to get access to a connecting wire.
Connect a wire of a control lamp with weight.
Pierce the insulation with the test tip:
If shutter (1) the steering lock is fixed when installing the lock drum, press the bolt down with a screwdriver until the locking pin is fixed (2). Now mount the lock drum.
The photo on the left shows the control unit for the central locking or anti-theft system on the right at the passenger's feet next to the driver.
On right: The airbag control unit is located between the front seats under the center console.
There is voltage at terminal 1 5A of the thinner black wire only when the key is in the position «ignition on».
The black thick wire of terminal 1 5 is energized only in position «ignition on» And «engine starting».
The black/red wire of terminal 50, which sends a start signal to the starter, is energized only in position «Engine starting».
In this way, you can check the switches, to the connecting wires of which you can get close with a test lamp. If you cannot get to the connecting wire of a switch without much effort, then you can check as follows:
Example of a rear seat heating rocker switch: Remove the switch.
First, it is checked whether the switch is in order. Connect to contact tabs «2» And «3» ohmmeter.
When switch position «incl.» the ohmmeter should show 0 ohms. In switch position «off» the instrument shows ∞ Ohm.
If the switch is OK, the connection terminals are checked.
To identify the connection terminals, first grasp the switch. With marked contact tabs (1 to 5) connection terminals can be defined.
Now you can check whether current is supplied through the corresponding terminals and, accordingly, whether there is contact with ground.
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