Chassis High Speed GMLAN Circuit Description

Fig 1: Chassis Expansion Bus Block Diagram

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
DF	Serial Data Chassis Expansion Bus
DF	Serial Data Chassis Expansion Bus
DF	Serial Data Chassis Expansion Bus
DF	Serial Data Chassis Expansion Bus
DF	Serial Data Chassis Expansion Bus
DF	Serial Data Chassis Expansion Bus
DF	Serial Data Chassis Expansion Bus
DF	Serial Data Chassis Expansion Bus
UGN	COLL IMMINENT BRK: VEHICLE FORWARD MOVEMENT, BRAKE PREFILL and INTELLIGENT BRAKE ASSIST
UVZ	SENSOR: COLLISION AVOIDANCE and MITIGATION, VEHICLE REVERSE MOVEMENT
UGN	COLL IMMINENT BRK: VEHICLE FORWARD MOVEMENT, BRAKE PREFILL and INTELLIGENT BRAKE ASSIST
UVZ	SENSOR: COLLISION AVOIDANCE and MITIGATION, VEHICLE REVERSE MOVEMENT
UFQ	PARK ASSIST: FRONT, REAR, LATERAL-FRONT (SEMIAUTOMATIC STEERING ADVANCED PARKING AID)
F55	CHASSIS: CONTINOUSLY VARIABLE REAL TIME DAMPING MAGNETO RHEOLOGICAL
NJ2	STEERING: ELECTRIC, BELT DRIVE
F46	CHASSIS: ALL WHEEL DRIVE (AWD)
K36	K36 Inflatable Restraint Sensing and Diagnostic Module
B99	B99 Steering Wheel Angle Sensor
K124	Active Safety Control Module
B119	B119 Multi-axis Acceleration Sensor
K41	K41 Front and Rear Parking Assist Control Module
K19	K19 Suspension Control Module
X84	X84 Data Link Connector
K17	K17 Electronic Brake Control Module
K43	K43 Power Steering Control Module
K47	K47 Rear Differential Clutch Control Module

The GMLAN Chassis Expansion Bus is basically a copy of the High Speed GMLAN Bus except that its use is reserved for chassis components. This implementation splits message congestion between two parallel buses helping to insure timely message transmission and reception. Sometimes communication is required between the Chassis Expansion Bus and the primary High Speed GMLAN Bus. This is accomplished by using the K17 Electronic Brake Control Module (EBCM) as the Gateway module. Since the High Speed GMLAN Chassis Expansion Bus and primary High Speed GMLAN Bus operate in the same manner, the diagnostics for each are similar.