There are many reasons result in Volvo VOCOM I 88890300 connection error,here show solution for it.
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Volvo VOCOM 88890300
Fault tracing
Connection fault diagnosis
Make sure the product is keyed on (check the instrument cluster to make sure that the battery voltage is ok).
Check the vehicle cable (make sure none of the PINs are bent).
Check that the communication unit is working properly (please see the documentation of the communication unit).
Check that all the LED
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