When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Run-Start Circuit Failure Leads to Top Nonfunctioning
Troubleshooting & Technical Questions & ModificationsHave technical or modification questions about the Crossfire?
Find out the answer, or give advice in here!
Hi everyone. I bought my SRT6 roadster this past spring in Florida with a known issue with the top. Electrical function does not work at all - windows do not go down when the latch handle is rotated with ignition on, and light in top button is not powered. With my DRBIII emulator, I have verified all related modules are working (BCM, PTCM, CLP), and all switches, sensors, solenoid, etc are fine. The only anomaly was that the BCM-IGN Voltage output was showing “OFF” instead of “ON”. With that being the case that would certainly help explain why the electric top functions would be non-operational.
Upon further investigation I found F7 to be blown, preventing the Run-Start voltage to be present at the BCM. Fuse continues to blow so I suspect a short of some type. In the wiring diagram, the F7 circuit also supplies current to the Automatic Day / Night Mirror (which my 05 roadster does not have) and an Intrusion Detector (which is listed as export and I am assuming I don’t have) in addition to the BCM. Before I tackle the mess that is the Underhood Accessory Fuse Block, I just wanted to ask these questions for anyone who might know:
Were the models after 04 prewired for the dimming mirror (I.e. 20ga. PK/RD/BK wire leading from the fuseblock up to the mirror location)?
Are the domestic models prewired for the intrusion sensor, and if so where would that be located?
Would greatly appreciate any answers to these questions, or any other insight on where to look for the short.
Last edited by Egyorko; Sep 6, 2021 at 06:04 PM.
Reason: Wanted to alert reader that I solved the problem in a subsequent post.
Re: Run-Start Circuit Failure Leads to Top Nonfunctioning
I also realized that the short could be in one of several outputs from the BCM that is sourced internally from pin 58 (Run-Start). I’m thinking this might be the case, since the BCM circuit card that came with the car was fried (see below - someone may have used a bigger fuse instead of addressing the issue). If anyone knows what outputs may be sourced from pin 58 internal to the BCM that would be helpful.
Re: Run-Start Circuit Failure Leads to Top Nonfunctioning
Originally Posted by Egyorko
I also realized that the short could be in one of several outputs from the BCM that is sourced internally from pin 58 (Run-Start). I’m thinking this might be the case, since the BCM circuit card that came with the car was fried (see below - someone may have used a bigger fuse instead of addressing the issue). If anyone knows what outputs may be sourced from pin 58 internal to the BCM that would be helpful.
Have you downloaded the service manual and perused the BCM system circuit diagrams? The pinouts will locate the circuits for you, you can build from there the answers to your questions. Looks like quite a few pins are effected. The manual is free to download and available with a search of the site. Good luck!
Re: Run-Start Circuit Failure Leads to Top Nonfunctioning
Problem solved!!! Going from Post #2, I started looking at functions that relied on having voltage from the ignition in the RUN position. Turned out there was a near dead short in the Control Module Cooling Fan. It was no small effort to remove it, but once I did (and replaced the #7 fuse) I had full top functionality, including a working rear defogger. I haven't taken the fan apart yet but I suspect water/moisture got inside. I will look for a replacement, but in the meantime, top down fun!
Run-Start Circuit Failure Leads to Top Nonfunctioning
Have you downloaded the service manual and perused the BCM system circuit diagrams? The pinouts will locate the circuits for you, you can build from there the answers to your questions. Looks like quite a few pins are effected. The manual is free to download and available with a search of the site. Good luck! 
