| 摘要 |
A test unit determines the existence of open or short circuits within the speakers and speaker wire harness of a stereophonic front and rear speaker system in a vehicle. The test unit, having a buzzer incorporated therein, is directly electrically attached to the speaker wire harness through an existing harness plug, which plug includes a lead for supplying electric power from the vehicle battery to the test unit. A rotary switch, mounted upon the test unit and operating in conjunction with a test unit mounted toggle switch, serially tests for both open and short circuits in each speaker and the wire harness leading to and from each speaker. An audible tone emanating from the buzzer and/or a speaker provides an indication of an open or short circuit condition and identifies the location of the fault.
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