Engine Controls - BCM Unsuccessfully Updated/No Start
INFORMATIONBulletin No.: 09-08-56-003
Date: September 16, 2009
Subject: Information on Body Control Module (BCM) Not Completing Theft Deterrent System Components 10-Minute Learn Procedure, Resulting in DTC P1631 Setting and Vehicle Not Starting
Models:
2001-2004 Chevrolet C5 Corvette
Some technicians may replace the body control module (BCM) with a remanufactured unit instead of a new OEM unit. After programming the BCM with the proper RPO configurations using a scan tool, an unsuccessful theft deterrent system components 10-minute learn procedure occurs. This may result in a no start condition and/or a DTC P1631 being set.
The reason this may happen is due to recent internal changes during the BCM remanufacturing process that no longer allow the 10-minute learn procedure to function properly.
Follow the steps below if you are replacing the BCM:
Important
If you have already performed the 10-Minute Learn Procedure, DO NOT replace the BCM BEFORE performing the 30-Minute Learn Procedure.
1. The service BCM EEPROM chip must first be programmed with the proper RPO configurations by using a scan tool. Refer to Body Control Module (BCM) Programming/RPO Configuration in SI.
2. Once the BCM EEPROM chip has been programmed, perform the Theft Deterrent System Components 30-Minute Learn Procedure. Refer to Programming Theft Deterrent System Components in SI.
3. During programming, the battery voltage must be maintained within the proper range of 12-15 volts. Only use the approved Midtronics(R) PSC 550 Battery Maintainer (SPS Programming Support Tool EL-49642) or equivalent during programming.
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