Help with a temp control DTC code

[edco]

I've been trouble shooting my heater and ended up changing the AC Amplifier, when I do the self-diagnostics I'm getting Rear Defrost and Rear heat buttons blinking. Any idea what to look at, I'm not seeing that configuration in my shop manual "Most likely missing it " my rig is a 1999 - Thanks in advance - Matt

 

[TXSunDevil]

Hope this helps. From the 2002 FSM

 

[TXSunDevil]

 

[edco]

Thank you for posting the info from the work shop manual, much appropriated I'm getting both the rear defrost and the rear AC or fan switch blinking after the DTC test. Both the larger buttons toward the bottom of the photo. I see some codes for the rear AC switch but not with the defrost, maybe I'm just missing it?

 

[TXSunDevil]

I do not see it either. Have you tried clearing the code and see what returns?