Test R: The Auxiliary Panel/Floor Control Only Is Inoperative/Does Not Operate Correctly

PINPOINT TEST R: THE AUXILIARY PANEL/FLOOR CONTROL ONLY IS INOPERATIVE/DOES NOT OPERATE CORRECTLY

R1-R3:

R4-R6:

R6-R8:

R8-R9:

R10-R11:

Normal Operation
Under normal operation, to rotate the auxiliary temperature blend door actuator clockwise, the SJB supplies voltage to the auxiliary temperature blend door actuator motors through the circuit 1379 (PK/LB), and supplies ground through circuit 1380 (TN/YE). To rotate the auxiliary temperature blend door actuator counterclockwise, the SJB reverses the voltage and ground circuits.

The auxiliary temperature blend door actuator feedback resistor is supplied a ground from the SJB through circuit 1125 (BN) and a 5-volt reference voltage on circuit 1124 (WH). The SJB reads the voltage on the auxiliary temperature blend door actuator feedback circuit 1131 (LG) to determine the auxiliary temperature blend door actuator position by the position of the actuator feedback resistor wiper arm.

Possible Causes
- An open in circuit 1379 (PK/LB), 1380 (TN/YE), 1124 (WH) or 1131 (LG).
- A short to ground circuit 1379 (PK/LB), 1380 (TN/YE), 1124 (WH) or 1131 (LG).
- A short to voltage circuit 1379 (PK/LB), 1380 (TN/YE), 1124 (WH) or 1131 (LG).
- A short together circuits 1379 (PK/LB) and 1380 (TN/YE) or 1124 (WH) and 1131 (LG).
- Auxiliary temperature blend door actuator.
- SJB.