Test I: No Operation In Some Blower Speeds

PINPOINT TEST I: NO OPERATION IN SOME BLOWER SPEEDS

I1-I3:

I4-I5:

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