Test A (Fuse, Dimmer Switch, Power Relay, Amplifier, Driver Control)

Check for loose connection at foot switch, power relay, connector near driver control, or in line connector between sensor amplifier cable and wire harness.
Disconnect red wire (override) from foot switch. If lower beam is obtained in both positions, replace foot switch.
Disconnect sensor amplifier cable at in line connector. Make a test lamp from a No. 53 bulb and 2 pieces of wire. Ground one test lamp lead and touch the other to yellow terminal in connector. Test lamp should light. If not, check for blown fuse or loose connection at driver control connector or power relay.
Connect one test lamp lead to battery voltage and touch the other lead to white terminal in connector, then rotate driver control knob counterclockwise and bulb should light. If not, check for loose connection at driver control connector, or defective driver control (open circuit).
Connect one test lamp lead to battery voltage and touch the other lead to black terminal in connector. Operate foot switch two or three times. Test bulb should light in one position of foot switch, and headlights should be on lower beam for both positions. If not, check for loose connections at foot switch or power relay, a poor ground at power relay, or a defective foot switch or power relay.
If steps 1 through 5 do not locate problem, sensor amplifier is at fault and should be replaced.