Troubleshooting - 3M Opticom Installation Instructions Manual

Vehicle Equipment Installation Instructions

7 Troubleshooting

Table 7-1 shows the symptoms of 3M™
Opticom™ GPS Priority Control System Vehicle
Equipment installation problems. The table also
shows the possible causes of those problems and
suggests solutions to correct them.
Table 7-1. Troubleshooting Symptoms, Possible Causes, and Solutions
Symptom
Vehicle control unit POWER LED
will not light.
Times in log are incorrect.
GPS will not acquire.
(GPS LED is amber.)
Table 7-2 shows the expected voltages at various
wiring terminals.
Possible Cause
Wiring incorrect.
Remote activation line not active.
Fuse/s blown
Vehicle control unit failed.
Time localization not set, or set
incorrectly.
Initial start-up may take up to 15
minutes.
Radio/GPS unit's view of sky is
obstructed.
Garage re-radiator not operating.
RF interference.
Incorrect wiring.
Radio/GPS cable connector (terminal
block) plugged in backwards.
Radio/GPS unit failed.
Radio/GPS antenna failed.
Vehicle control unit failed.
No power to GPS receiver.
Solution
Check wiring. Verify that control
unit is getting 12 VDC.
Verify that 12 VDC is being applied
to blue wire of vehicle interface
harness.
Replace fuses with 2A/250V 3AG
SLO-BLO.
Return unit to 3M for service.
Set correct offset for your area.
Wait 15 minutes.
Move unit or remove obstructions.
Repair or replace re-radiator.
Turn off vehicle control unit for 15
minutes, then try again.
Check wiring at both ends of
radio/GPS cable.
Plug in terminal block correctly.
Return unit to 3M for service.
Return unit to 3M for service.
Return unit to 3M for service.
Check voltage between brown (+)
and brown/white (–) wires at both
ends. It should be about 8.3 VDC.
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