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Some 2008 Toyota Scion xB and xD vehicles equipped with a Remote Engine Starter (RES) may exhibit a discharged battery condition after short term storage, due to parasitic draw.
Toyota recommends using a Fluke 88 digital multimeter (or equivalent) and the GR8 battery diagnostic station (SPX/OTC P/N 00002-MCGR8).
NOTE: The Remote E/G Starter ECU is available under part number 08190-42830.
Use the procedure listed here to assist with the diagnosis of excessive parasitic battery draw to correctly identify if the RES ECU is the cause.