Test FD: Step 5

5) Code 75: Check For BOO Circuit Cycling  Code 75 indicates that while brake pedal was released during KOER Self-Test, BOO signal was high. Possible causes for this fault are: brake pedal depressed during entire self-test, open BOO/brakelight circuit (between ECA and brakelight ground), short to POWER, or faulty ECA. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect for and repair any damaged wiring. Install breakout box, leaving ECA disconnected. Set DVOM on 20-volt scale. Measure voltage between test pins No. 2 and 40 while depressing and releasing brake pedal. If voltage cycles, replace ECA, remove breakout box and repeat QUICK TEST.