Bendix Commercial Vehicle Systems AutoVue LDW by Bendix CVS Service Data Sheet - Manual (Page 13)

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3.4 ADVANCED TROUBLESHOOTING
Refer to the AutoVue ® LDW system by Bendix CVS wiring
diagram on page 12, during these procedures.
General. Inspect the camera and its lens, for any damage
and the wiring for any pinching or cuts. If a camera bracket
appears to have been reinstalled, check if the bracket is
level by removing the camera (slide upwards), and use
a torpedo level on the bracket tabs (See Figure 8, on
page 6). Note that the other vehicle cab accessories
must be carefully installed since mounting screws, etc.
that penetrate locations where the AutoVue components
or wiring are routed can cause shorts or wiring breaks.
If you do not have the capability to read the J1939 error
codes it is recommended to, in turn swap out components
with known good system components in the following order:
switch; processor; camera.
In practice this would result in:
• Temporarily replace the switch with a known good
switch, retest. If this does not correct the problem put
the original switch back in.
• Temporarily replace the processor box with a known
working unit. If this does not correct the problem put
the original box back in.
• Temporarily replace the camera with a known working
unit. If this does not correct the problem put the original
camera back in.
If after temporarily replacing all the major components the
green lamp still fails to illuminate, hardware issues have
been eliminated and the technician can focus elsewhere
(wiring, mis-installation, etc.) for the source of the problem.
Confirm the processor part number:
Potentially a processor may have been programmed for
one vehicle model but was mis-installed or moved to a
different vehicle model. Call Bendix to verify that you
have the correct processor part number on the vehicle.
In cases where — after start-up — an Enable/Disable
switch is pressed but the “enable” (green) and “status”
(amber) lamps remain on:
1. Conditions: Vehicle parked, with the ignition on. Using
a voltmeter connect the positive (+) lead to gray wire
and the negative lead (-) to a good chassis ground, do
not use the black wire on switch for ground.
2. The voltage reading should be between 3.2 V to 3.6 V.
3. Using a voltmeter connect the positive (+) lead to the
switch pin black wire and the negative lead (-) to a
good chassis ground.
4. The voltage reading should be between -0.10 V to
0.1 V.
5. If the above voltages are not correct, turn off the ignition
and remove the switch from the switch socket.
6. Using an Ohmmeter, connect the positive (+) lead
to the gray wire, and the negative lead (-) to a good
chassis ground, do not use the black wire.
7. The resistance reading should be between 30k Ohms
and 70k Ohms.
8. If the resistance reading is less than 30k Ohms,
disconnect the main connector from the processor
and recheck the resistance of the gray wire. If the
resistance is still less than 30k Ohms, then a short
may exist in the wiring harness (for example, a screw
may have been driven in to the wire).
9. If the resistance reading is greater than 70k Ohms, an
open circuit may exist in the wiring harness.
10. Using an Ohmmeter, connect the positive (+) lead
to the black wire and the negative lead (-) to a good
chassis ground.
11. The resistance reading should be less than one (1) Ohm.
12. If the resistance reading is greater than one (1) Ohm,
an open circuit may exist in the wiring harness.
13. If the above voltages are correct, turn off the ignition
and remove the switch from the switch socket.
14. Using an Ohmmeter, connect the positive (+) lead to
blue wire and the negative lead (-) to a good chassis
ground, do not use the black wire.
15. The resistance reading should be greater than
10k Ohms.
16. Using an Ohmmeter, connect the positive (+) lead to
violet wire and the negative lead (-) to a good chassis
ground, do not use the black wire.
17. The resistance reading should be greater than
10k Ohms.
In cases where — after start-up — an Enable/Disable
switch is pressed but the “enable” (green) lamp remains
on and the “status” (amber) lamp does not remain on:
1. Conditions: Vehicle parked, with the ignition on, and
all LDW components (camera, processor, & switch)
are connected.
2. Turn off the ignition and remove the switch from the
switch socket.
3. Using an Ohmmeter, connect the positive (+) lead to
blue wire and the negative lead (-) to a good chassis
ground, do not use the black wire.
4. The resistance reading should be greater than 10k
Ohms.