Acura 3.5 RL Manual page 1322

Troubleshooting Precautions (cont'd)
Global Positioning System (GPS) Limitations
The GPS cannot detect the vehicle position in these instances:
For the first 5 to 10 minutes after reconnecting the battery.
When the satellite signals are blocked by tall building, mountains, tunnels, large trees, or large trucks.
When the GPS antenna is blocked by something on the package shelf.
When there is no satellite signal output. (Signal output is sometimes stopped for satellite servicing.)
When the satellite signals are blocked by the operation of some electronic aftermarket accessories.
The precision of the GPS is reduced in these instances:
• When only two satellite signals can be received. (Three satellite signals are required for accurate positioning.)
• When the satellite control center purposely lowers the signal precision.
LCD Display Unit Limitations
• In cold temperatures, the display may stay dark for the first 2 or 3 minutes until it warms up.
• When the display is too hot because of direct summer sunlight, it will remain dark until the temperature drops.
• When the humidity is high and the interior temperature is low, the display may appear cloudy. The display will clear
after some use.
• Fingerprints on the touch panel may sometimes be noticeable because of the panel's low-reflection coating. When
cleaning the panel, wipe it gently with a soft cloth. To avoid scratching the panel, do not rub too hard.
• The touch panel is an infrared system, so there is no need to press hard. If a touch switch does not function immediately,
shift your finger slightly on the switch, and touch it again.
Symptom Duplication
• When the symptom can be duplicated, follow the self-diagnostic procedures (picture diagnosis mode) and the appro-
priate troubleshooting procedures.
• When the symptom does not reappear or only reappears intermittently, ask the customer about the conditions when
the symptom occurred.
— Try to establish if outside interference may have been the cause.
— Try to duplicate the symptom under the same conditions the customer was experiencing.
— Vibration, temperature extremes, and moisture (dew, humidity) may be factors that are difficult to duplicate.
Service Precautions
• Before disconnecting the battery, make sure you have the anti-theft codes for the radio and the navigation system, and
write down the frequencies for the radio's preset buttons.
• After servicing, park the vehicle in an area where the GPS satellite signals will be unobstructed, and check the satellite
mark on the display.
• When the battery is disconnected, the clock is reset to "0:00." The clock will reset to the correct time after the system
receives the GPS satellite signals.
• After reconnecting the battery, you have to wait to get an initial signal from a satellite. This takes about 10 minutes.