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My AC is working fine, cold and hot, but I get this code B1531 and the "auto" is blinking on AC display.

Anyone know what it is? Could it be temperature sensor?
Grand vitara 2.0 4x4 2010 (brazil)

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A diagnostic code reading procedure of the flashing indicator light is here...

Beyond that and the scanner info you have already, I suggest that you find a good A/C shop to tackle this issue. ;)
 

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Answers to where to start looking are both in the screenshot.

B1504 Sunload sensor. 0 w/sqm car in the dark when you git those readings? Its the sensor in the dash by the windscreen drivers side. Pull it, tie a string to the cable before unplugging it and measure it for resistance change to light levels as per the fsm.

The B1531 can be caused by a sticking blend door causing the actuator to jam. Start by checking the doors for free movement then start digging deeper.
 
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