In this video we tackle a very intermittent issue in a Grand Caravan where the wipers stay on,
power windows inoperative, power door locks inoperative, and almost every trouble light on the
dash lights up. In fact, the instrument cluster displays a No Bus message.
During one of these occasions, Jordan connects the WiTech2 scanner to determine what
modules are offline. As well, he scans for codes, finding only a communication code. (Of
course!) The scanner shows that all of the modules that are offline share a common bus.
Using a wiring diagram, Jordan determines what wires to probe in order to scope the bus. The
scope pattern shows the bus pulling battery voltage, indicating a shorted module rather than a
wiring issue. (Phew!)
After removing panels to access the suspect modules, all he needs to do now is wait for the
problem to re-occur. And wait. And wait. When the problem rears it’s ugly head again, the
problem is quickly located.

All of the test tools used in this video can be purchased at www.autotesttools.com
Also, we can upgrade your current test equipment.

Don't forget to follow us on
Facebook:   / autoaidetechnicalservices  
Instagram:   / autoaide  
Website: http://www.autoaide.ca
Twitter: @autoaidetech
Follow this link to be added to our email to receive the latest news and webinar information
https://form.jotform.com/201346646227252