VUE AWD L4-2.2L VIN D (2005)
LOW SPEED GMLAN SERIAL DATA CIRCUIT
The data link connector (DLC) allows a scan tool to communicate with the low speed GMLAN serial data circuit. The serial data is transmitted over a
single wire to the appropriate control modules. The transmission speed for low speed GMLAN is up to 83.33 Kbps. This high speed is used for
programming purposes only. Under normal vehicle operating conditions the speed of the bus is 33.33 Kbps. This protocol produces a simple pulse
train sent out over the low speed GMLAN serial data bus. To wake up the control modules connected to the low speed GMLAN serial data bus, a
wake-up pulse of 10 volts is sent out over the bus.
The modules on the low speed GMLAN serial data line are:
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Radio, w/U32
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Digital radio receiver (DRR), w/U2K
KEYWORD 2000 SERIAL DATA CIRCUIT
The Keyword protocols utilizes a single wire bi-directional data line between the modules and the scan tool. The message structure is a request and
response arrangement. Keyword 2000 is used for scan tool diagnostics only. The modules do not exchange data on these systems. They are two
independent Keyword serial data circuits connected to data link connector (DLC) terminals 7 and 12. The following modules communicate with scan
tool through Keyword 2000 serial data circuits:
Keyword serial data to DLC terminal 7
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Transmission control module (TCM), w/L61
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Engine control module (ECM)/powertrain control module (PCM)
Keyword serial data to DLC terminal 12
Electronic brake control module (EBCM)