Test T: No Operation In Some Blower Speeds - EATC
PINPOINT TEST T: NO OPERATION IN SOME BLOWER SPEEDS - EATCT1-T3:
T3-T4:
Normal Operation
Under normal operation, the blower motor relay coil receives ignition voltage. Voltage is supplied to the relay switch contact. The coil receives ground from the remote climate control (RCC) module through circuit 275 (YE)/276 (BN) if any function except OFF. When the relay coil is energized, voltage is delivered to the blower motor control module through circuit 371 (PK/WH). Ground for the blower control module is provided by circuit 57 (BK). The RCC module sends pulse width modulated signal to the blower control module through circuit 776 (OG/BK) to control the blower speed.
Possible Causes
- An open in circuit 776 (OG/BK)
- A short to ground in circuit 776 (OG/BK)
- Blower motor control module
- Remote climate control (RCC) module