GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2007 🢒 Escalade - 2WD 🢒 Power and Signal Distribution 🢒 Data Communications 🢒 Data Link References

This table identifies which serial data link that a particular module uses for in-vehicle data transmission. Some modules may use more than one data link to communicate. Some modules may have multiple communication circuits passing through them without actively communicating on that data link. This table is used to assist in correcting a communication malfunction. For the description and operation of these serial data communication circuits refer to Data Link Communications Description and Operation .

Control Module

Data Link Type

Diagnostic Procedure

Schematic Reference: Data Communication Schematics

Audio Amplifier w/UQA/UQS

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Assist Step Control Module, (Articulating Running Boards (ARB)) w/BRS

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Auxiliary Body Control Module (XBCM) w/JL1, JL4

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Body Control Module (BCM)
    • High Speed GMLAN
    • Low Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Chime Module w/UL5

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Digital Radio Receiver (DRR), w/U2K

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Driver Door Switch (DDS) w/YE9
    • Low Speed GMLAN
    • Local Interconnect Network (LIN)

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Electronic Brake Control Module (EBCM)

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Electronic Suspension Control Module (ESCM)

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Engine/Powertrain Control Module (ECM/PCM)

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Fuel Pump Control Module (FPCM) w/LFA, LC9, LMG, LY2, LY5, L76, L92

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

HVAC Control Module

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Inside Rearview Mirror (ISRVM) w/TQ5

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Instrument Panel Cluster (IPC)

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Inflatable Restraint Passenger Presence System (PPS) Module w/AL0

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Inflatable Restraint Sensing and Diagnostic Module (SDM)

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Inflatable Restraint Roll Over Sensor (ROS) w/ASF

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Liftgate Module (LGM) w/E61

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Memory Seat Module (MSM)/Driver Position Module (DPM) w/AN3

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Passenger Door Switch (PDS) w/YE9
    • Low Speed GMLAN
    • Local Interconnect
    • Network (LIN)

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Radio

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Rear Heated/Vented Seat Control Module (RHVSM) w/KA6

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Rear Seat Audio (RSA) w/UK6

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Remote Control Door Lock Receiver (RCDLR) w/AP3, AP8

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Theft Deterrent Module (TDM)

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Transfer Case Control Module (TCCM) w/NP8, NR3, NQH, NQF, NGQ

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Transmission Control Module (TCM)

High Speed GMLAN

Scan Tool Does Not Communicate with High Speed GMLAN Device

Ultrasonic Parking Aid (UPA) Module w/UD7

Low Speed GMLAN

Scan Tool Does Not Communicate with Low Speed GMLAN Device

Vehicle Communication Interface Module (VCIM) (OnStar®), w/UE1
    • High Speed GMLAN - pass through only
    • Low Speed GMLAN