DR-11B Radiator Fan Relay Control Circuit

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.
4. If voltmeter reading is between 0 and 7 volts, locate and repair open in wire from terminal No. 21 of logic module white electrical connector to radiator fan relay.