Fixing ground and shorts? Ground locations and wire color codes?

DALE MCCUMONS

MEMBER
2005 CADILLAC CTS
3.6L
6 CYL
2WD
AUTOMATIC
150,000 MILES

Hey Ken, thanks for your help with everything. I'm trying to fix the speedometer, and cruise, anyway after I pull seats. I need the location of all grounds to make sure they are all good. And any info for fixing bad wires under seats hoping it's not the ECM please send links. Also, I need links for disabling sir system and anything else you think will help. Thank you very much.

6 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

Hi Dale,

Here is the ground and SIR wiring diagrams so you can see how they work and where the ground is, have you done CAN scan to see where the problems are? You can get a CAN scanner (Controller Area Network) from Amazon for about $36.00.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

and

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Amazon CAN scanner link for about $35.00.

https://amzn.to/3R9lJ60

This guide can help you check the connections:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem.

Images (Click to make bigger)

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Wednesday, October 19th, 2022 AT 9:23 AM

DALE MCCUMONS

MEMBER
11 POSTS

Hi ken thanks again for the help for 2005 Cadillac CTS 3.6l Vin 7. On the ground locations can I get pictures with the names of the ground locations? The ones you sent are small and hard to read. Also, the color codes. The wires running under seats is there a several grounds? And how many will affect the speedometer, cruise, ect, ect? Those are the locations I'm hoping will fix this or do you all the grounds affect it? I appreciate your help. This car is a big pain with all these sensors. Thanks again

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Thursday, October 20th, 2022 AT 10:24 AM

DALE MCCUMONS

MEMBER
11 POSTS
2005 CADILLAC CTS
3.6L
6 CYL
2WD
AUTOMATIC
150,000 MILES

Hi Ken, thanks for answer to last question. The diagrams of ground locations are fine, but can I get pictures with the names of ground locations from under hood, under dash, and under seats, etc, and any other locations that I should check? Also, wire color codes need. All the sensors on this car make it a giant pain. I couldn't afford to have a shop check all of this so thank you very much for your help and if you have any suggestions or more information that I need to check I would really appreciate it. Thank you again, have a good day.

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Friday, October 21st, 2022 AT 9:51 AM (Merged)

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

Did you click on the images to enlarge them? Also, the colors of the wires and location are mentioned in the diagrams as well. Most of the ground wires are black.

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Friday, October 21st, 2022 AT 9:54 AM

DALE MCCUMONS

MEMBER
11 POSTS

Yes, are there pictures of the ground locations? Took it auto zone and had scanner hooked up. Trouble codes power train system-secondar DTCs-po573-00-brake switch circuit 1high voltage. Anti-lock brake system b3903, c0460-steering position sensor malfunction, c0461-steering position sensor range, u100-class 2 data link malfunction. The check engine light is off. Engine runs okay. Transmission shifts okay. Odometer reads 150000 + plus miles. Scanner reads 1385 miles. I can't afford to take to shop and pay for them to search for hours to find problem unless that' my last resort. I would appreciate your help, thanks.