Test J: No Operation In Some Blower Speeds

PINPOINT TEST J: NO OPERATION IN SOME BLOWER SPEEDS

J1-J3:

J4-J5:

Normal Operation
Under normal conditions, when the function selector switch is in any position except OFF, the blower motor switch completes the circuit 261 (OG/BK) from the blower motor through either the blower motor resistor, or directly to ground.

Possible Causes
- circuit 57 (BK) open
- circuit 261 (OG/BK) open
- circuit 752 (YE/RD) open
- circuit 754 (LG/WH) open
- blower motor resistor
- blower motor switch