Re: what the little black box next to the brain box is...
If you mean next to the ECU then you may be talking about the transmission computer. If you mean under the radio and they are blue and grey, they are for getting check engine light codes. there is no such thing as a brain box so i dont really know what you are talking about.
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There should also be a 15 amp EFI2 fuse next to the two headlights fuses. The 20 amp fuse is the main power supply to the circuit opening relay which controls the fuel pump. If you're 100% certain that the 20 amp fuse has power on both sides with the key in the on position and you do not have power to the black wire with a red line that the fuel pump this means is the circuit opening relay is not functioning or the computer is not energizing or turning on the circuit opening relay. Circuit opening relay is located on the back side of the junction block on the driver side instrument panel. This is where the other fuse box is located. If you reach your hand up onto the back side of this fuse box there is one large gray single wire probably 8 gauge and next to that are three relays that are exactly the same the first relay closest the passenger side of the circuit opening relay does a click when you turn the key to the start position? As a test you could swap that relay with the one next to it and see if the car starts or it clicks in the start position. Your other option to rule out whether not you also are dealing with the fuel pump problem is to run a jumper wire with 12 V directly to the black wire with a red tracer. You would need to tap into this wire with the connector plug-in otherwise you will also have removed the ground or use a jumper box and just use power on the black wire with a red line and ground on the white wire with a black line pins in the fuel pump bracket.
the number on the pcm has to match and you will need to swap the eprom out from the old one to the new one. open the unit and you will see a rectangular eprom simply lift it out and make sure it gose back in the same direction usually a small white dot in one corner to indicate pin 1
if you are looking for the engine temp switch(sending unit,
it is located on the engine next to the large coolant hose (the hose
that is not attached to the pump) on the engine. Just a little above and
to the passenger side of the vehicle
If your 2010 Ridgeline is the same as the 2009, the wires colors and location are listed below;
Power Lock pink/black - MICU, green 30 pin plug, pin 25 The MICU (Multiplex Integrated Control Unit) is part of the dash fuse box, in the driver kick. It has 2 plugs on the left side edge of the fuse box. Meter this wire while pressing the passenger door lock switch. Power Unlock pink/blue - MICU, green 30 pin plug, pin 9 The MICU (Multiplex Integrated Control Unit) is part of the dash fuse box, in the driver kick. It has 2 plugs on the left side edge of the fuse box. Meter this wire while pressing the passenger door lock switch.
this is a fairly simple job. The location of the unit varies within the same year make and model. Take your vin number and ask the local deal about recalls and -- where the location of you vehicle computer is - sometimes these are called brain boxes by dealers - - once located you will have little problem in removing and replacing the unit.
THREE LOCATIONS ONE IS ON THE LEFT SIDE OF DASH ON THE END,PULL LITLE COVER MAIN FUES PANEL IS UNDER HOOD NEAR BATTERY,BIG SQUARE BLACK COVER PULLS OFF, LAST ONE NEXT TO BRAKE PEDAL, BLACK COVER WITH SILVER NUT HOLDING IT ON(RELAYS ARE THERE)
first, remove the front black cover located next to the front grille. next, remove the black cover located on the left. the retainers can be removed by pushing down on pin located in the middle. once these are removed, you'll see a black box. this contains the air filter. it can be opened by pushing the metal clips outwards. lift the cover and you'll find the filter. most stores don't stock these filters so you'll probably need to order it.