Horn switch (41)
| Horn switch (41) |
| Location |
Horn switch (41)
| Main task |
Used to control the horn. CIM sends the switch status on the bus.
| Type |
Single pin switch integrated in the driver's airbag. The switch is connected to the Sentronic circuit on automatic cars.
| Connection |
The steering wheel buttons are resistive multiplexed (5V) and divided into 2 circuits; switches for Sentronic, horn and SET in one circuit and other buttons in the second. The 2 circuits have a common ground from the CIM. Each circuit has an extra resistor for diagnosing an open circuit. The lead for the Sentronic/horn/SET is fed with 5V via a 560 Ω resistor integrated in the CIM. When the horn switch closes, the lead is grounded and the voltage drops to 0V. All the leads go via a coil spring to the CIM. The CIM sends the status of the horn and the other buttons on the bus.
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