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--- doc:appunti:hardware:toyota_yaris_radio [2017/02/03 06:18] – niccolo
+++ doc:appunti:hardware:toyota_yaris_radio [2017/02/19 12:40] (current) – [Steering wheel commands] niccolo
@@ Line 15: / Line 15: @@
 ===== Steering wheel commands =====
-There are five buttons at the steering wheel: volume + and -, channel up and down and mode. At the radio the connector has only three wires, connected to the 20 pin harness.
+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:
+{{.:yaris:yaris-steering-commands-schematic.png?direct&480|Toyota Yairs steering wheel commands: schematic}}
+{{.:yaris:yaris-steering-commands-wires-pinout.png?direct&200|Toyota Yairs steering wheel commands: radio connector pinout}}
+With a multimeter we read the resistance values at the radio receiver connector while pressing each button:
+^ Resistance at SWG - SW1  ^^
+| No buttons pressed  |  100 kΩ |
+| Seek +              |     0 Ω |
+| Seek -              |   329 Ω |
+| Vol +               |  1000 Ω |
+| Vol -               |  3110 Ω |
+^ Resistance at SWG - SW2  ^^
+| No buttons pressed |  100 kΩ |
+| Mode               |     0 Ω |
+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 |