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Topdiag BT400 is 4-in-1 multi-function circuit/battery tester：
1.Battery replacement：Protect the memory of the vehicle ECU when replacing the battery
2.OBD2 Port Pin Voltage Test：Test OBD2 interface can work well
3.Circuit Leakage Test:Test the vehicle circuit for leakage
4.Battery Test:Cranking Test/Charging Test/Battery Data and health assessment
Topdiag BT400 Support Circuit Leakage Test：
1. Prepare an extra spare vehicle battery , Connect the device to the spare battery
correctly with red clip to positive black clip to negative pole, Plug OBD2 adapter to the
Data Link Connector socket in the Vehicle.
2. Select Current menu under “ Current” functions. It will enter in the waveform
monitoring interface as fugure 3.
3. Unplug and the car fuse or related electrical components on the car to observe the
current changes, if there is a current drop instantly or abnormal, it proves that there is a
possibility of leakage in the fuse circuit or the related components issue, Compare the
circuit diagram of the car electrical system and locate the leakage point.
Topdiag BT400 Support Replace Battery：
Prepare an extra spare vehicle battery , Connect the device to the spare battery correctly with red clip to positive black clip to negative pole, Plug OBD2 adapter to the Data Link Connector socket in the Vehicle.Selecte the “ Replace battery ” function, Press OK key to enter, and follow the steps as displayed to continue . 
