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Discussion Starter · #1 ·
Help: My Insight is possessed – I had the IMA replaced by Honda under Warranty about 37,000 miles ago, been about 4-5 years. Been getting Code P1648 & P1449 showing then not showing and changing and not changing .... READ DETAIL BELOW

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I was getting code P1648 & P1449; the IMA was not charging or assisting, the display was showing no bars. So I researched and decided to run “gas” only by doing the following:

1. Completely unplugged the BCM all 3 cables ( you push the bottom up and prey the top with a screwdriver )
2. Left the battery switch off.

This worked, but my BATT light was on

3. Installed a new 12v ( the old one was toast )
4. Plugged the 3 cables back into the BCM
5. Turned on the battery switch

Surprise!!!

The car had no IMA, Engine, or Battery light displayed and to top it off the IMA stated to charge

Wife and I drop to a party and back 5 miles total ---- No problem ---- I charged and use asset
I drove the babysitter home and 10 – 15 miles down the road the IMA & Engine light popped. So, I

1. Completely unplugged the BCM all 3 cables
2. Left the battery switch off.

Pokey, but working.

Forward 2 days:

I decided to disconnect the 12v and let it sit for about an hour then plugged the 3 cables back into the BCM and turned on the battery switch

Surprise!!!

The car had no IMA, Engine, or Battery light displayed and to top it off the IMA stated to charge, again……

WHY,WHY, WHY ????

I never heard or seen the big IMA fan kick on, could the batteries be overheating, because of the fan not working?
I’ll get a meter on the fan Wednesday….

My wife will drive to and from school (work) about 4 mile round trip and see if it trips? With such a short trip the batteries should not get to hot.

Thanks,
James
 

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decided to disconnect the 12v and let it sit for about an hour then plugged the 3 cables back into the BCM and turned on the battery switch

Surprise!!!

The car had no IMA, Engine, or Battery light displayed and to top it off the IMA stated to charge, again……

WHY,WHY, WHY ????
Because when you disconnected the 12 v. battery, all diagnostic trouble codes (DTC's) were erased. When you reconnected the 12 v. battery, no DTC existed, so no trouble light illuminated, and the IMA system behaved normally, at first. But after driving for a while, the same problems occurred again, DTC's were set, the trouble lights illuminated again, and the IMA system quit working.

Bottom line: the problems indicated by the DTC's are real and need to be dealt with in some way. Disconnecting the IMA battery as you did is one (unsatisfactory?) way to deal with a "bad" IMA battery.
 

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You mentioned replacing the 12 V battery. Have you checked,
with a VOM, to be certain that new battery is being fully charged,
and is kept charged?..

The 12 V battery is vital for the IMA to work properly, and if
the engine does not/can not keep it well charged, the exact symptoms
you describe will occur.

Carry a VOM with you, and whenever you stop, verify that the 12 V
voltage is above at least 12.4 volts with the engine off,
and above about 13 V at idle. If voltage is spastic, carefully check all
battery connections.
 

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Discussion Starter · #5 ·
If the lights trip again, I'll have to run "gas" only. I'm an unemployed teacher and money it more then tight.
 

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Discussion Starter · #6 ·
CycleDoc:

I'll carry a VOM and check. I agree that the 12v battery is vital for the IMA to work properly. It's hard for me to believe the battery is dead or dieing after only 36k miles on it.
 

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Discussion Starter · #8 ·
Yes, 37,000 miles in 5 years.

My wife has been driving it to work (about 1.5 miles from home ) for about 2 years. When I worked it was driven about 10 miles. We are both teachers so the car is not driven for about 2 months total each year. We have 2 tots so we mostly drive are other car.

Yes, the IMA battery does not cycle very often.
 

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Help: My Insight is possessed – I had the IMA replaced by Honda under Warranty about 37,000 miles ago, been about 4-5 years. Been getting Code P1648 & P1449
Given that you got a P1449 and a P1648 simultaneously, I suspect corrosion at the BCM/MCM connectors. Open up the lid and unplug ALL the connectors from the BCM and MCM and reseat them. Then reset your system by disconnecting the 12V battery for a few seconds.

Try that and let me know how it goes.
 
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