Jump to content
CaddyInfo Cadillac Forum

Where is the underhood relay center?


stswrx

Recommended Posts

My 99 STS, engine replacement step 24 in my GM manuals is to disconnect the electrical harness from the underhood relay center. For the life of me, I can't find a picture in the manual anywhere of what it looks like or where it is.

Help?

Link to comment
Share on other sites


On my 96 one was behind the left (driver's side) wheel, under a cover. Remove the strut brace, remove the cover. Not sure if same on the 99.

Bruce

2016 Cadillac ATS-V gray/black

Follow me on: Twitter Instagram Youtube

Link to comment
Share on other sites

It's on the RH (passenger) side between the windshield washer tank and the power steering pump pulley. The cover is stamped with "FUSES RELAYS".

That is what you are seeking.

Jim

Drive your car.

Use your cell phone.

CHOOSE ONE !

Link to comment
Share on other sites

Thanks Bruce/Jim.

I looked at that Fuse relay box, it appears to be 2 boxes stacked ontop of one another with clips on the outside. I lifted the clips, but the wiring coming into the boxes prevents me from separating them. Where exactly are the connectors the manual suggests I disconnect? This is part of dropping the cradle, so if there are parts not in the way I'd like to leave them be.

Thanks for answering the dumb questions ^_^ . There will be more...

Link to comment
Share on other sites

I was just in that area when I lowered my carriage. If you look behind the fuse relay panel there is a plug that I believe you can disconnect. You will need to disconnect all of the sensors and pull the wiring harness out. Here are a couple of photos that might help:

Bank 1

(1) IC Module

(2) IC Connector C2

(3) IC Connector C4

(4) IC Connector C3

(5) IC Connector C1

(6) Bank 1 Sensor 1 (Rear) HO2S

(7) ECT Sensor

(8) Linear EGR Valve

Bank 2

(1) Engine Oil Level Switch

(2) CKP Sensor A

(3) CKP Sensor B

(4) MAP Sensor (beneath dress cover)

(5) Engine Oil Pressure Switch

post-2998-1184121911_thumb.jpg

post-2998-1184121919_thumb.jpg

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...