Fan 2 (Right) - No Low Speed Fan Operation (P0480)

If radiator fan 2 is operating on high speed, but not low speed it would indicate that the radiator fan low control circuit, radiator fan 2 low relay, radiator fan motor and the radiator fan 2 low relay output circuits are likely good. An issue with any of these would cause the fan to not operate on high speed also.

1. Turn the ignition on. Using the scan tool, select the Rad/Cond Cooling Fan Relay #1 Control State actuator. Back probe and measure the voltage on the radiator fan relay 2 output circuit (A112) at the radiator fan 2 resistor connector. Battery voltage should be present.
   1. If battery voltage is present, continue to step 2.
   2. If battery voltage is not present, repair the circuit for an open or high resistance.
2. Back probe and measure the voltage on the (N24) circuit at the radiator fan 2 resistor connector. The voltage will not be equal to battery voltage but there should be voltage present.
   1. If voltage is not present, replace the resistor and retest.
   2. If voltage is present, repair the (N24) circuit for an open or high resistance between the resistor and the harness splice.