doc:appunti:hardware:toyota_yaris_radio
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doc:appunti:hardware:toyota_yaris_radio [2017/02/03 06:40] – [Steering wheel commands] niccolo | doc:appunti:hardware:toyota_yaris_radio [2017/02/19 12:40] (current) – [Steering wheel commands] niccolo | ||
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===== Steering wheel commands ===== | ===== Steering wheel commands ===== | ||
- | There are five buttons at the steering wheel: **volume +**, **volume -**, **channel up**, **channel down** and **mode**. At the radio the connector | + | There are five buttons at the steering wheel: **volume +**, **volume -**, **channel up**, **channel down** and **mode**. At the radio side there are only **three wires** connected to the **20 pin connector**. |
Here it is the schematic: | Here it is the schematic: | ||
- | {{.: | + | {{.: |
{{.: | {{.: | ||
+ | |||
+ | With a multimeter we read the resistance values at the radio receiver connector while pressing each button: | ||
+ | |||
+ | |||
+ | ^ Resistance at SWG - SW1 ^^ | ||
+ | | No buttons pressed | ||
+ | | Seek + | 0 Ω | | ||
+ | | Seek - | 329 Ω | | ||
+ | | Vol + | ||
+ | | Vol - | ||
+ | |||
+ | ^ Resistance at SWG - SW2 ^^ | ||
+ | | No buttons pressed | 100 kΩ | | ||
+ | | Mode | ||
+ | |||
+ | so we calculated the resistor values: | ||
+ | |||
+ | ^ Steering Wheel Commands Resistors | ||
+ | | R1 | 100 kΩ | | ||
+ | | R2 | 100 kΩ | | ||
+ | | R3 | 330 Ω | | ||
+ | | R4 | 680 Ω | | ||
+ | | R5 | 2200 Ω | | ||
+ | |||
+ |
doc/appunti/hardware/toyota_yaris_radio.txt · Last modified: 2017/02/19 12:40 by niccolo