Test M
PINPOINT TEST M: THE BLOWER MOTOR IS INOPERATIVE - EATCTest M1-M4:
Test M4-M6:
Test M7-M9:
Test M9-M11:
Test M12-M14:
Test M14 Continued:
Normal Operation
Under normal operation, when blower operation is requested a signal is sent from the control module to the Smart Junction Box (SJB) over the SCP BUS. The SJB sends a message over the SCP bus to the PCM.
The blower motor relay coil receives a ground from the Smart Junction Box (SJB) through circuit 1322 (BN/WH). The coil receives voltage through circuit 298 (VT/OG). Voltage is supplied to the relay switch contact through circuit 364 (BK/LG). When the relay coil is energized, voltage is delivered to the blower motor and the blower motor control module through circuit 371 (PK/WH). Ground for the motor is provided through circuit 261 (OG/BK) from the blower control module. Ground for the blower control module is provided by circuit 1205 (BK). The EATC module sends pulse width modulated signal to the blower control module through circuit 1120 (BK/WH) to control the blower speed.
Possible Causes
- An open in circuit 1205 (BK), 364 (BK/LG), 261 (OG/BK), 371 (PK/WH), 298 (VT/OG) or 1322 (BN/WH).
- A short to ground in circuit 1120 (BK/WH).
- A short to voltage in circuit 1322 (BN/WH).
- A/C blower relay.
- Blower motor control module.
- EATC module.
- SJB.