Note On Intermittents

WARNING: This page is about a different car, the 1990 Cadillac Seville and 1990 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.

Manipulate related BCM and ECM wiring in each gear range while observing BD41 or EI74 values. If a failure is induced, values will change indicating an open or short to ground. Ensure good terminal connections exist at BCM, ECM and PRND321 switch. If terminal contacts are good and Code B127 continues to set, replace BCM.

Fig 1: BCM Code B127 Circuit Diagram

Fig 2: BCM Code B127 Flow Chart (1 of 3)

Fig 3: BCM Code B127 Flow Chart (2 of 3)

Fig 4: BCM Code B127 Flow Chart (3 of 3)