The first thing to do is to remove ECU which is located behind the passenger
side kick panel. Remove the sill by removing the four plastic screws
(position highlighted by red circles) and carefully prying it off.
Don't
lose the screws and clips. You'll need them to put it back when you're
finished.
Next, the kick panel itself should be removed by undoing the highlighted
three screws.
Note: In this picture you can see that the interior
light is on - it shouldn't be! Before any electrical work on your car, you
should disconnect the battery for safety. Short circuits can cause fires or
damage the electronics!
Remove the plug off the back of the lamp and put the kick panel aside.
The ECU must then be disconnected from the wiring harness by undoing the
bolt circled on the left. Then undoing the two highlighted screws top and
bottom.
As you can see, this model of 180SX (1991 SR20DET) has ECU type
number 62. There are several different numbers used in different years and
models. Some of the information outlined here may differ a little if you
have a different numbered ECU, though the general process should still
apply.
After unclipping the cable tied harness from the bottom tab, the ECU can now
be completely removed from the car.
The first thing to do is to remove ECU which is located behind the passenger
side kick panel. Remove the sill by removing the four plastic screws
(position highlighted by red circles) and carefully prying it off.
Next, the kick panel itself should be removed by undoing the highlighted
three screws.
Remove the plug off the back of the lamp and put the kick panel aside.
The ECU must then be disconnected from the wiring harness by undoing the
bolt circled on the left. Then undoing the two highlighted screws top and
bottom.
After unclipping the cable tied harness from the bottom tab, the ECU can now
be completely removed from the car.