Chrysler Repair: 1998 Plymouth Voyager Service Engine Soon Light, 1998 plymouth voyager, voyager service

Question
I had a bad radiator fan relay, which I have replaced.  Relay works, fans work as they are supposed to.

However, the "Service Engine Soon" light still comes on, so I had the code read.  It is P1491, for the radiator fan relay.  How do get the light to quit coming on now that parts are replaced, and everything is working as it is supposed to?

L

Answer
Symptom:
P-1491 RADIATOR FAN CONTROL RELAY CIRCUIT
When Monitored and Set Condition:
P-1491 RADIATOR FAN CONTROL RELAY CIRCUIT
When Monitored: With the ignition key on, battery voltage greater than 10 volts, and the
PCM requests the fans to be turned on.
Set Condition: An open or shorted condition is detected in the radiator fan relay control
circuit.
POSSIBLE CAUSES
FUSED B (+) CIRCUIT OPEN
RAD FAN RELAY OUTPUT CIRCUIT, 0 VOLTS TO BATTERY V
RADIATOR FAN RELAY GROUND CIRCUIT OPEN
RADIATOR FAN RELAY DEFECTIVE
RAD FAN RELAY CONTROL CIRCUIT SHORT TO GROUND
RADIATOR FAN MOTORS W/H INTERMITTENT DEFECT
RADIATOR FAN MOTORS W/H OBSERVABLE DEFECT
RADIATOR FAN RELAY CONTROL CIRCUIT OPEN
PCM DEFECTIVE (RADIATOR FAN MOTORS