Okay, I removed, cleaned and reassembled G402 (passenger side?), checked fuse #7 (good) and nothing changed. Cleared code, drove to IHOP, code was set. Cleared code, drove home, code was set. What does it mean when the P1652 has an H and a C?

Anyhow, this minor glitch probably has nothing to do with my Doomsday Event when "no comm" is possible with the PCM from every module. In the meantime I'll keep working the ground issue while staying close to home.

Thanks ,
Vince

 

Vince

Lets go directly to the source of the issue. Open the left storrage compartment and the ECS module will be located on the forward bulkhead of the box. There is a plug on the bulkhead too. Disconnect the module, inspect the plugs (BOTH) and look for corrossion, bent and loose pins. Also inspect the module for being exposed to moisture.

See how that pans out.

BC

 

Bill, the plugs on the unit look fine. No signs of wet/corrosion. I can't
get the blkhd connector off. What's the secret? If you want to call me - 301 373 3454, or I can call you if you prefer?

Okay, checked the manual and it looks like the bulkhead connector is not one that disconnects from the trunk side.

Thanks,
Vince

 

Very true I worked for chev. dealership also left for Honda. GM wonders what the problem is.

 

Vince

Im glad we talked!! I hope we get to the root cause of the problems. It looks like you may also have a chassis ground issue, and have had a BCM issue in the past so I will send you some BCM, ground and ground cleaning pictures.

Here is Chassis Ground G-101.



Remove it and you will also find a seperate ground eyelet. That is the ground for the Front Mounted EBTCM.

To properly clean the connector, you MUST disassemble it! Start By prying up the two retainer tabs (one on each side) and prying the front half off of the body.



Here are the two halves seperated.





This is the CORROSION that I found on my connectors.



Clean it off with a wire brush, snap her back together and bolt it back in. Now you only have 6 more to clean like that one!





Chassis grounds G-101, 102. 201 202, 301, & 302 use the same type of connectors. So far, I have not found any corrosion issues on any connectors other than G-101.

Then you have splice packs that look simular to the chassis ground connectors except that they DONT have the ground tab on them. They ground things like all of the lights in the front of the car to one SP and then the splice pack has one wire that goes to one of the chassis grounds. ie SP 101 gets grounded to Chassis ground g-101.. ect ect!!



Clean those chassis grounds and let us know how you make out!!

Bill C

 

Vince

Here are the pictures of the BCM out of the box!







The corrosion that I found was on the back of the board down by where the two connectords are soldered to the board.

BC

 

Thanks Bill.
I assure you that talking to one of the Legends Of The Forum was a most unexpected and informative experience. I think that you have helped all you can at this point. I just have to get to work on your suggestions. Today, football is my excuse to put it off another day. But I'll let you know what I find.

 

Well, the car's been running fine since the last "hiccup" New Years Eve.

I've cleaned, burnished, polished and reassembled grounds 101, 102, 401 and 402. I removed and cleaned the PCM connectors and two of the BCM connectors (I'm chicken to remove it) which all looked remarkably clean and corrosion free. Other than the recurring P1652 code, all seems quite normal. But, I can't get those (few) hairs on the back of my neck to lay down. We've driven about 200 "close-by" miles so far without incident, but I feel MURPHY's presence in the backround.
You know - that nagging feeling that at the worst possible time and place....SHAZAAM!.

By the way, I read a C6 post about battery issues where a GM rep asked if anyone with problems ever parked near a security gate? Seems the signal wakes up the computers which then drains the battery. Well, that's where I was when the calamity struck - sitting at a gate. The gate went up - the car went down. I wonder if there's a connection?

Thanks Bill, Don and all you others for advice and support . This will be it - unless disaster strikes again.

 

Got to hand to ya Bill, thats some great info. Cenzo, good luck with the car you are probably ok and as you stated it could have been some EMI interference causing the electronics to glitch.

 

Okay Kids, here's the latest.
After 9 weeks of trouble free operation, the car dies on the frikken Governor Thomas Johnson Bridge Friday before last. Fortunately, just made the apex and got a restart on the way down. Another 3 miles and the engine just shuts off again. Battery good, electical seems ok, all warnings displayed on DIC. Cranks but no start. Same symptoms as in the original post.

Flat-bedded to same dealer. This time it stayed broken. Four days later, after swapping out PCM and some other components to no avail, technician calls Tech Support. He's told to check the ground by the battery box, G104. THAT WAS IT! After disassembly, cleaning and reassembly, everything was back to normal! And here's the best part - NO CHARGE!

They classified it as a "callback" since it had been there before for the same problem and not fixed. Remember now, when they went to fix it the first time, the problem had gone away. So it really wasn't their fault.This is Bell Motors in Leonardtown Md. Will they get more of my business? I think so.

So, if your C5 is getting a little long in the tooth, you might want to schedule a pre-emptive Ground Cleaning Day BEFORE you get symptoms - or stranded someplace. Fortunately I was close to home - twice.

Once more thanks to all who shared my experience and offered help and sympathy - Bill, Don et al.

SEE YOU AT WATERSIDE!!?

 

Glad to hear the problem is fixed!!

All these corosion problems makes me NOT want to drive my car in anything but good weather!!

VR

 

Glad it's fixed. I think I need to start looking at mine. I don't want to ger stuck anywhere.