GM Service Manual Online
For 1990-2009 cars only

DTC

Diagnostic Procedure

Module(s)

1

DTC 1 Fasten Seat Belt Indicator Control Circuit Shorted B+ or Ground

BCM

2

DTC 2 Battery Feed To Courtesy Lamps

BCM

3

DTC 3 Courtesy Lamps

BCM

6

DTC 6 Theft Deterrent Relay Control Circuit Shorted

BCM

7

DTC 7 Horn

BCM

8

DTC 8 Remote Keyless Entry

BCM