Renix O2 Sensor / REM Showing 0 Volts for Heater Circuit

[oleskool]

So yesterday while driving around my REM popped up a CEL. I pulled the code and it’s O2 Heater Voltage Low. So when I got the truck back home I went through and checked the circuit and the relays. Oddly enough I am getting the proper voltages on the proper wires at the O2 connector and the O2 sensor is reading correctly. Out of curiosity I threw in a known good O2 to see if that made a difference but still the same reading of 0.0 V from the REM. Is there somewhere else I need to be looking, reset the computer etc?  Or is the REM not relaying the correct data?  Everything on the connector side and relay side are good at this point unless the connector to the O2 are not making a good connection which I will dig into tomorrow. Anywhere else I should look?

 

TIA!

[Ωhm]

With KEY ON check for Battery Voltage (B+) at D2_9. I think REM uses this for the reading.

 

 

[oleskool]

3 hours ago, Ωhm said:

With KEY ON check for Battery Voltage (B+) at D2_9. I think REM uses this for the reading.

 

 

Thank you. Looks like the REM connector isn’t picking up the voltage. I did verify everything was working correctly however.