Test FD: Step 12

12) Check For BOO Circuit Cycling  Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector. Inspect connector for damaged pins, corrosion, and loose wires. Install breakout box, leaving ECA disconnected. Set DVOM on 20-volt scale. Measure voltage between test pin No. 2 or test pin No. 5 (as applicable per vehicle) and test pin No. 40 while applying and releasing brake. If voltage cycles, switch circuit is okay, replace ECA, remove breakout box, reconnect all components and repeat QUICK TEST. If voltage does not cycle, repair open BOO circuit between ECA and BOO connection to brakelight circuit. Repeat QUICK TEST.