People have posted scans of pinouts but they are expired, simple pin location would help greatly. No ground feed to front o2, heater code with good power feed but weak (6v) ground side (no load, dvm).
Edit, correct answer is:
Connector "D" has pins for front O2 sensor:
Sensor + D19
Sensor - D29
Heater 1/2 is D4 and D5.
Disregard colors as they change between ECM and underhood connector.