Exhaust flap via ECU

I have installed a varex system on my car . I have 2 relays , set up as following :

Relay 1 :

Pin 30 motor +

pin 87a +12V

pin 87 GRN

Pin 85 +12

Pin 86 ADU/ECU

Relay 2 :

Pin 30 motor +

pin 87a GRN

pin 87 +12V

Pin 85 +12V

Pin 86 ADU/ECU

It works for a few times and then it burns the motor due to being constant power fed . even when I remove the +12V for both relays I have power coming to the relays , which I believe is due to reverse polarity from the trigger wire .

Has anyone done something similar ? If not does anyone with more experience with these kinda stuff have any recommendations ?

TIA

From the way you have the relays set up ,it looks like you are using 1 output from the ecu.

This will require 2 outputs.

Switch ON 1 output at a time

Output 1 =open

Output 2 =closed

Set the outputs up on timers in the ecu.

Set the ON time for the amount of time it takes to move the valve into position ,(maybe 1 second more) then switch the output off. (I assume there is no limit switches on the motor)

Output 1 to relay 1 ,pin 85

Output 2 to relay 2 ,pin 85

Relay 1 pin 30 motor+

Relay 2 pin 30, motor -

Wire both relays

Pin 86 = 12v

Pin 87A = gnd

Pin 87 =12v

Thanks for the reply . I am pretty sure I had tried what you suggested but I didn't have a complete circuit with the suggested set up. From what I found it is when I have the car turned off the the relays have constant power and constantly feeds the motor causing it to burn .

But I can give it another try with your recommendations .

No problem.

Also make sure the 12v supply's to the relays are being switched through by the main relay .(the same relay that is supplying power to the ecu , injectors ,coils etc)

This will eliminate any back feeding though the aux output which can in some instances keep the ecu powered up when main relay is off