DR-12B Radiator Fan Relay Control Wire

1. Turn ignition switch off, then disconnect logic module white electrical connector.
2. Connect a voltmeter between logic module white electrical connector terminal No. 21 and ground, then turn ignition switch to the Run position.
3. If voltmeter reading is within one volt of battery voltage, replace logic module.
CAUTION: Before replacing the logic module check the terminal in cavity No. 21 of the white connector to make sure it is not crushed causing a poor connection.
4. If voltmeter indicates no voltage, locate and repair open in wire from terminal No. 21 of logic module white electrical connector to radiator fan relay.