Serial bus communications became common with General Motors in the early 1980s when the ALDL (DLC of yesterday) contained a pair of wires from the ECM sporting a pulsing square wave when 10,000 ohms of resistance between ground and the serial bus was put into play via the scan tool being plugged into the connector and powered up. Take a few minutes to understand how serial bus communication networks work, learn a few simple tricks on diagnosing them when they don’t work and we’ll help remove that F for frustration. Don’t despair if this happens in your bay. After all, your scan tool could help you diagnose the vehicle if it could only communicate with it.
for short) usually starts in about the time these kinds of problems come into your bay. The F for frustration in “Frustrating Ridiculous Electronic Device” (F.R.E.D. When communications networks fail to communicate on today’s vehicles, the results can range from mysterious U codes in multiple modules to scan tools that are unable to display anything beyond “Check Vehicle Identification” or some other onerous message. Which module is talking and which one isn’t? This Tech2 is trying to talk to the highlighted module. Have you ever asked yourself the question, “What exactly causes a U code?” A famous quote from the prison warden in the classic 1967 Paul Newman movie “Cool Hand Luke” answers the question best: “What we’re dealing with here is a failure to communicate!”
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