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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Data Communication System) >> Diagnostic Information and Procedures >> DTC B1390 >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The body control module (BCM) has an internal precision battery voltage sensor connected to dedicated battery positive voltage from X1 terminal 51 and dedicated ground terminal 19. The BCM then compares the sensors voltage to the battery positive voltage from X1 terminal 52. DTC B 1390 will set if these voltages are different by greater than 2 volts.

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