User Manual

Installation
Instructions
Component Data Link
Engine Controller J1708 J1939
Transmission
Controller
J1708 J1939
Brake Controller J1708 J1939
IP Cluster J1708 N/A
Cluster N/A J1939
Body Controller N/A J1939
Data
Link
LED
Nomenclature
Component
J1939
ENG Engine Controller
TRN Transmission Controller
BRK ABS Brake Controller
EGC Electronic Gauge Cluster
BOD Body Controller
J1708
IPC Instrument Panel
Controller
BRK ABS Brake Controller
TRN Transmission Controller
ENG Engine Controller
N A VLT Voltage for Tool
Top View
BENDIX
®
DLMU
™
MONITORING UNIT
The Bendix
®
DLMU
™
(Data Links Monitoring Unit) is a
diagnostic tool providing the technician with a visual indication
of various components that are active on the J1708 and J1939
communication links.
When working on or around vehicles, follow all standard
industry safety practices. Bendix’s standard safety warnings
are shown on page 2 of these instructions.
DEVICE FEATURES
The DLMU
™
unit attaches to the 9-pin off board diagnostic
connector located in the cab of the vehicle.
The data links monitoring unit indicates the following
components:
FIGURE 1 - THE BENDIX
®
DLMU
™
UNIT
NO COMMUNICATION
If the DLMU
™
unit does not detect any devices on either the
J1939 or J1708 link, it will indicate this by illuminating each red
LED individually in a clockwise pattern. This pattern indicates
no response from any of the requested devices and will continue
until a device responds or the tool is disconnected from the
9-pin diagnostic connector.
Possible sources of communication issues are:
1. J1708 or J1939 communication is not present at the
diagnostic connector.
2. ECU or the diagnostic connector has no power.
3. The DLMU™ monitoring unit can not arbitrate bus
access.
4. Malfunctioning DLMU™ unit.
OPERATION
When DLMU
™
unit is fi rst plugged into the 9 pin diagnostic
connector, and receives power, the green VLT LED is illuminated
(indicating the data links monitoring tool is receiving power).
The DLMU
™
unit will then monitor the various electronic
components and illuminate red LEDs to indicate which
components responded to the request or are broadcasting on
the data links.
LED Lights
Illuminate