GM Service Manual Online
For 1990-2009 cars only

DTC

Diagnostic Procedure

Module

B1000

DTC B1000

BCM, IPC, MSM, Radio, RCDLR, RDM, SDM

B1001

DTC B1001

IPC, Radio, SDM

B1004

DTC B1004

IPC

B1009

DTC B1009

RDM

B1420

DTC B1420

BCM

B1440

DTC B1440

BCM