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Hello I went into Diagnostic mode and retrieved these codes.

PCM 603 HISTORY

ACM B1340 HISTORY

ACM B1341 HISTORY

SDM B1327 HISTORY

i HAVE NO HEAT. iF i AM READING THESE CODES RIGHT 1340 AND 1341 IS AIR MIX DOOR 1AND2 MOVEMENT FAULT. mY QUESTION IS IF i AM RIGHT WHERE AND HOW DO i FIX THE AIR MIX DOORS? iS IT THRU THE GLOVE COMPARTMENT? dO I HAVE TO REPLACE A ACTUATOR? PLZ HELP. I HAD TO REPLACE THE BATTERY RECENTLY BELIEVE IT OR NOT IT WAS THE ORIGINAL BATTERY. I HAVE A 1999 DEVILLE. I THINK PCM 603 AND SDMB1327 ARE RELATED TO THAT. aM I on the right track? I LOVE THIS FORUM AND ANYONE WHO CAN HELP ME PLZ CHIME IN. THANKING U IN ADVANCE.

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Please turn off your CAPS LOCK key.. :)

Did you have heat before you replaced the battery?

Did the NO HEAT problem start when you replaced the battery?

If it did...

Take a couple of minutes, and slowly cycle thru the full temp range... from 60 to 90 then back to 60.

Do that a couple of times and see if the doors will reset themselves and work properly.

If not... then you need to address the blend door problem.

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