China Aerospace Telecommunications Ltd
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（2）Methods of locating the ground wire
The ground wire of vehicle generally adopts the mode of grounding.
（3）
Methods of locating ACC detection wire (IGN+)
ACC detection wire (IGN+) is the ground based on which the main unit
judges whether the vehicle is in the started mode, and it may be located in the
wiring harness inside the baffle plate under the steering wheel or inside the
fuse box. Method of locating: ground one end of the test probe and put the
other end on the wire. When the vehicle key is respectively in the position of
ACC, ON or START, the LED indicator of the test probe illuminates. When the
key returns to the position of OFF, the LED indicator of the test probe goes
off.
！WARNING: ACC detection wire (IGN+) must connected.