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Code P0685, ECU/ECM relay location needed

Tiny
AALIYAHMC
  • MEMBER
  • 2007 KIA OPTIMA
  • 174,798 MILES
I have the car listed above with a 2.7. Where can I find the ECU/ECM relay? I’m aware there is 2 one under the hood the other in the dashboard behind the radio but where and what does it look like? I’ve seen your diagram but it doesn't really explain where to look on my car. I’ve literally took everything apart in my car and can’t find it on the inside.
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Saturday, September 11th, 2021 AT 6:11 PM

5 Replies

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

Have you already checked the main relay under the hood (see picture below)?
I have also attached the basic diagnostics for the code P0685.

Please note that code can be also for having bad wiring for that circuit, corrosion or having a short.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Please let me know what you got.
Thank you.
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Saturday, September 11th, 2021 AT 8:13 PM
Tiny
AALIYAHMC
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I’ve tried everything diagnostics says it’s the relay underneath the dashboard but I’ve tore my whole car apart and still can’t find where the second relay inside the car is.
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Sunday, September 12th, 2021 AT 2:24 AM
Tiny
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  • 6,383 POSTS
For the PCM Alldata only shows that one relay under the hood. Can you tell me which manual states there is a second one?
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Sunday, September 12th, 2021 AT 7:04 PM
Tiny
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  • 3 POSTS
I called Kia dealership and they say there are two. One behind the dashboard and one underneath the hood.
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Monday, September 13th, 2021 AT 4:46 AM
Tiny
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  • MECHANIC
  • 6,383 POSTS
Interestingly I do not see the one under the dash on Alldata.
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Monday, September 13th, 2021 AT 9:14 PM

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