STS V8-4.6L VIN A (2005)
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Electronic brake control module (EBCM)
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Electronic suspension control (ESC) module
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Engine control module (ECM)
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Transmission control module (TCM)
8. Data link connector (DLC) terminals 6 and 14 provide the connection to the GMLAN serial data high circuit and the GMLAN serial data low
circuit respectively.
15. If only one of the high speed GMLAN circuits is open all communication on the high speed bus will be disrupted.
19. The communication malfunction may have prevented diagnosis of the customer complaint.
Scan Tool Does Not Communicate With Low Speed GMLAN Device
SCAN TOOL DOES NOT COMMUNICATE WITH LOW SPEED GMLAN DEVICE
CIRCUIT DESCRIPTION
Modules connected to the low speed GMLAN serial data circuit monitor for serial data communications during normal vehicle operation. Operating
information and commands are exchanged among the modules. Connecting a scan tool to the data link connector (DLC) allows communication with
the modules for diagnostic purposes.
TEST DESCRIPTION