GASKET 1868404 - Caterpillar

Illustration 1 g06244026
(1) Air outlet motor
(2) Air outlet dampers
(P) ConnectorDiagnostics
Illustration 2 g06244051
(3) Air outlet select switch
(4) Monitor
Illustration 3 g06244634
Partial electrical schematic
Measure the value of the resistance in the air outlet motor (1) between terminals 1 and 3. See "Specifications" below for the correct resistance value. Proceed to Step 2.
If the resistance value is incorrect, see Step 3. If the resistance value is correct, see Step 4.
Replace the air outlet motor.
Disconnect the connectors from the motor and measure the voltage between the harness connectors RD/BK and BR/RD. See "Specifications" below for the correct voltage value. Proceed to Step 5.
If the voltage value is correct, see Step 6. If the voltage value is correct, see Step 7.
Check the wiring harness between the connector and the HVAC ECM. Repair the wiring harness if faulty. Also, check the source of the power system.
Reconnect the motor and measure the voltage between terminal 22 and 27 of the HVAC ECM. See "Specifications"below for the correct voltage value. Proceed to Step 8.
If the voltage values are incorrect, see Step 9. If the voltage values are correct, the system is operating correctly.
Check the wiring harness between the connector and the HVAC ECM. Repair the wiring harness if faulty. If the wiring harness is not faulty, see Step 10.
Replace the HVAC ECM.Specifications
Resistance ... 6.0k OhmVoltage between connectors ... 5 VDC
Table 1
Terminals 22 and 27 of Connector for the HVAC ECM
Damper Position Voltage Value
Front Vents 0.07
Front and Rear Vents 1.58
Floor Vents 2.80
Defrost Mode 4.38
Front, Floor, and Rear Vents 4.93
Illustration 4 g03291980