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it's an 05 SRX v6 3.6. intermitantly when i turn the key to start

the engine nothing happens. all i hear is a slight click by the gear shifter.

 

sometimes, if i disconnect the battery, and hear a faint high frequency

tone when reconnected, is an indication that it will start.

 

can someone tell me which relays are involved in starting this vehicle?

thanks.

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I trust you checked the battery voltage with a volt meter? 

Are you 100% sure the battery is good?  Has it been load tested?  I had a friend who assumed his battery was good because it was 30 days old, it was dead.  Heat kills batteries.  


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

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

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it's not the battery. the same issue occurred with the old battery and the new one.

 

it could be the starter relay. i'll start there, and check the grounds.

 

i also got the dreaded U0100 - lost communications to ECM", and p0700 - tranny

PCM lost communications.

 

i'm starting to wonder if these vehicles are designed to be disposed of after

13 or so years, considering all of the electronics. it's hard to believe they mounted the ECM

right onto the engine.

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17 hours ago, jschunke said:

it's starting fine with the new starter relay.

Good for you, glad you found the culprit, thanks for reporting back your finding


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

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

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it happened again. turn the key, no turnover.

so i cleaned the ground to the ECM and the body ground. fiddled and now it's

running again.

 

it's a replacement ECM from flagship One. lifetime warranty. It just doesn't seem probable that an

ECM would fail intermittently. i can send it in for testing.

 

we'll see if the clean grounds resolve this. otherwise i'm dumping this vehicle..

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I am beginning to see a need for electrical diagnostics experts as these cars age. What do you think about that?


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

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

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