K 3500 Truck 4WD V8-6.6L DSL Turbo VIN 1 (2001)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
PCM/BCM Replacement - DTC's B001/B1271/B1780 Set
File In Section: 06 - Engine/Propulsion System
Bulletin No.: 99-06-03-010A
Date: June, 2001
INFORMATION
Subject:
DTCs B1001, B1271 or B1780 Set When Replacing/Reprogramming Other Modules
Models:
1999-2002 All Passenger Cars and Trucks
With Class 2 Serial Data Communication Between Modules
This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 99-06-03-010 (Section 06 - Engine/propulsion System).
Class 2 Serial Data Communication allows control modules (i.e. the Powertrain Control Module (PCM), the Body Control Module (BCM), the Dash
Integration Module (DIM), the Instrument Panel Cluster (IPC), the radio, the Heating, Ventilation and Air Conditioning (HVAC) Controller, and the
Sensing and Diagnostic Module (SDM) to exchange information. This information may be operational information or identification information. Among
the identification information exchanged and compared within these modules is the Vehicle Identification Number (VIN). Typically, the PCM broadcasts
a portion of the VIN, while another module broadcasts another portion of the VIN. This information is compared by the SDM in order to ensure
installation is in the correct vehicle. When the broadcast VIN does not match the VIN stored within the SDM, the following actions occur:
^
DTC B1001 Option Configuration Error is set and deployment of the airbags is inhibited.
^
The VIN information is also used by the radio in order to prevent theft. When the broadcast VIN does not match the VIN stored within the radio, a
DTC B1271 ora DTC B1780 Theft Locked is set and the radio is inoperative.
This situation may occur when a vehicle is being repaired. When a PCM or a body control type module is replaced, the VIN information must be
programmed into the replaced (new) control module. A module which has had VIN information entered into it (for example, one taken from another
vehicle) cannot be reprogrammed. VIN information can only be entered into new modules. The ignition must be ON in order to program the control
module. Since the VIN information is broadcast when the ignition goes to ON from any other ignition switch position, DTCs may be set in the SDM
and/or the radio. Therefore, always follow the specified control module replacement procedures.
1.
After completing the repair, turn OFF the ignition for at least 30 seconds.
2.
Turn ON the ignition and check for DTCs using a scan tool.
If DTCs B1001, B1271, or B178C are present with a history status, DO NOT REPLACE THE SDM OR THE RADIO.
3.
Clear the DTCs from all modules using the scan tool. The SDM and/or the radio should then operate properly.
4.
Ensure the proper operation of the SDM by turning OFF the ignition and then turning ON the ignition. The air bag warning indicator should flash
seven times and then go OFF.
Refer to Corporate Bulletin Number 99-09-41-001 for additional information regarding proper reprogramming of the new/replaced module.
Clearing codes from the other modules is part of the replacement and reprogramming procedure for the replaced module. The repair is not complete
unless all codes have been cleared from all modules.
DO NOT SUBMIT CLAIMS FOR OTHER MODULE REPLACEMENTS OR REPROGRAMMING.
DISCLAIMER
