Top warning light on DTC B1777

OldGuyFla

Does the defogger work?

I checked out the manual & it looks like to me a good starting point would be at connector B311. But the manual says that connector isn't shown on the cable layout. I'll take a look at my car & see if I can find B311.

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High_Octane

Defogger for the rear window does not work. This DTC B1777 prevents that from happening. I can still turn on the defogger switch though.
What I am guessing is that pins 104 and 111 are getting power, which should not be the case since they are outputs that supply power to the defogger.
I already took out the two 20A fuses so pins 48 and 49 which are input pins, should not have any power going to it.

And how do you work in the roof compartment without the lid closing after a few mins? Disconnect the battery after opening the lid?

OldGuyFla

I had never left the lid open for any long time, so I went out this morning & let it stay open for an hour & it is still open. I don't know why it would close on its own.

Looking at my car I see a connector right at the lower side of the window on the right side. It plugs into the defogger. Have you tried seeing if that connector has voltage going to it?

Have you tried ohming out the actual filaments in the window to see if they are shorted?

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10MPlayer

I just had to replace a couple of hydraulic lines and fix a broken wire a while back. I did it old school and propped it open with a stick.

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About my name: I occasionally play a Conn 10M Tenor Saxophone - so 10MPlayer