More info for build notes in the readme

README.md

@@ -25,19 +25,26 @@ A module to augment the Aux-In functionality of SAAB 93NG's (2002/3+), to add Bl
   - Also handles CAN bus messages, for steering wheel Play/Pause/Next/Previous
 
 # Notes for building your own (by [jokubasver](https://github.com/jokubasver))
-- CAN H connects to LS GMLAN1 (wire can be found on the ICM connector pin 1, or solder directly to ICM connector PCB pad).
-  - Leave CAN L and LS GMLAN2 disconnected.
+- CAN H connects to LS GMLAN1 (green wire, it can be found on the ICM connector pin 1, or solder directly to ICM connector PCB pad).
+- CAN L connects to GND
+- Connect a 4.7k resistor between CAN H and CAN L
+  - So to make it simple - Since the whole Bluetooth Aux board is getting GND from the AUX connection, I connected GND from the MCP2515 module to CAN L, and I connected a 4.7k resistor across CAN H and CAN L on the MCP2515 module.
 
-- 5V, GND, AUX Left, AUX right can be soldered on the EHU PCB. All pads are clearly marked.
+- Everything also works if I leave CAN L disconnected and not use the 4.7k resistor. CAN L can be left floating as described here: https://electronics.stackexchange.com/questions/139562/single-wire-can-saab-9-3-i-bus-gmlan#comment670941_139882
+  - Question is - which is the proper way? Leave out the terminating resistor and leave CAN L floating? Or connect CAN L to GND and use a 4.7k terminating resistor? Both connection variants seem to work fine.
 
 - Instead of using 12V, the EHU 5V line can be used.
   - It turns off after ~10-15 seconds after locking the car with the remote. 
   - 5V wakes up as soon as you unlock the car.
+  - This requires the use of an isolated 5V-5V DC-DC converter (see below)
+
+- 5V, GND, AUX Left, AUX right can be soldered on the EHU PCB. All pads are clearly marked.
 
 - Using EHU 5V will cause some audible Bluetooth interference. 
   - Use an isolated 5V-5V DC-DC converter to eliminate it (CC3-0505SF-E would be pin-compatible and would fit nicely on the bluetooth aux kit PCB)
+  - I am personally using AM1SS-0505SJZ together with capacitors and inductors that are shown in the datasheet's example schematic. 
 
 - **Warning on EHU 5V line**
   - I have experienced massive current draw from the battery when using this 5V line previously, while experimenting with a generic Bluetooth Aux module. I tried it again with this project and everything is fine.
   - My guess is that my first experiment had a ground loop, and this either caused current to flow through the ground loop, draining the battery, or it confused the EHU and prevented it to go into sleep.
-  - To solve the ground loop, I left AUX GND disconnected on the EHU end.
+  - Therefore, I highly suggest you use an isolated DC-DC converter (whether you are using 12V, or 5V from the EHU)