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==== This is the exact removal flow the manual gives, and it’s the safest way to access A46. 461232-BMW_3-Series_E90-E91_200… ==== ===== - 10mm socket/wrench (battery terminals) ===== * Ratchet + extensions * Torque wrench (important) * Gloves/eye protection * Phone to take “before” photos (do it—future you will thank you) ===== 1. Ignition OFF. 461232-BMW_3-Series_E90-E91_200… ===== # In trunk, open the battery compartment. Remove right-side trim (plastic retainer). 461232-BMW_3-Series_E90-E91_200… # Remove the protective bracket over the battery (mounting fasteners) and lift it off. 461232-BMW_3-Series_E90-E91_200… # At the battery, disconnect negative FIRST (loosen fastener “A”). 461232-BMW_3-Series_E90-E91_200… - Be gentle: the IBS is attached to the ground cable and is stress-sensitive. The manual is loud about not pulling, prying, or levering on the IBS/ground cable. 461232-BMW_3-Series_E90-E91_200… # Unlock the BST plastic cover, loosen the positive cable fastener “B.” 461232-BMW_3-Series_E90-E91_200… # Carefully lift the rear power distribution panel (A46), positive cable, negative cable, and IBS off the battery and lay aside. 461232-BMW_3-Series_E90-E91_200… # Remove battery hold-down bolt “C,” disconnect the vent hose, lift the battery out. 461232-BMW_3-Series_E90-E91_200… ===== Bentley shows you how to lift A46 off as an assembly. Once it’s off and on a bench: ===== # Photograph everything: every cable routing, every nut, every connector position. # Transfer cables/connectors from the old A46 to the new A46 one at a time (so nothing gets swapped). - Remember: A46 includes the high-amperage fusible links—they aren’t serviced separately. 461232-BMW_3-Series_E90-E91_200… # Inspect the mating points for heat damage (discoloration, pitting, looseness). Any heat at a high-current joint = resistance = voltage drop = future meltdown. ===== - Reconnect negative LAST when reinstalling the battery. 461232-BMW_3-Series_E90-E91_200… ===== * Battery post pinch-bolt torque specs: - M6 = 5 Nm (44 in-lb) - M8 = 15 Nm (11 ft-lb) 461232-BMW_3-Series_E90-E91_200… * After battery reconnect, if the battery was replaced/changed in rating: the car may need CAS recoding + battery registration. 461232-BMW_3-Series_E90-E91_200…
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