The GM-48571-45 adapter harness is used as a diagnostic tool, in conjunction with previously essential tools, including the GM-39200-B Digital Multimeter and the GM-48571-A Pinout Box, to interface with the Hybrid Battery Module CSB connector on vehicles. This allows for the measurement of individual cell voltages and temperature sensor resistances. The Pinout Box has tip jacks for plugging in the DMM test leads. This adapter can be used on 10 or 12-cell battery section modules.