Mazda 2007 CX-9, Service Highlights

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ENTERTAINMENT
09-20–36
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AUTONOMOUS NAVIGATION OPERATION
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The navigation unit detects the position of the vehicle from a cumulative calculation of the vehicle's direction
and travelled distance based on the processing of direction data obtained from the gyro sensor and vehicle
speed signals obtained from the instrument cluster.
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Even when GPS satellite reception is not available, accurate detection of vehicle's position is still possible.
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Signals from GPS satellites are used partially for detecting direction data.
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GYRO SENSOR FUNCTION
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The gyro sensor is located in the navigation unit. The sensor converts yaw rate, which is one of the inputs used
in calculating the vehicle direction of travel from the vehicle cornering angle, into electrical signals. It then sends
these signals to the navigation unit.
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GPS (GLOBAL POSITIONING SYSTEM) NAVIGATION OUTLINE
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GPS is a navigation system developed by the U.S. Department of Defence. The system has GPS satellites
orbiting the earth at an altitude of approximately 21,000 km {13,000 miles}.
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There are at least five satellites over any point 24 hours a day.
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The navigation unit receives radio signals from these satellites and determines a vehicle's position.
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Terminal
Signals
16-pin connector
2A GND
2B B+
2C –
2D ACC
2E PRF SP IN (-)
2F MUTE
2G PRF SP IN (+)
2H Vehicle speed
2I PRF SP OUT (-)
2J –
2K PRF SP OUT (+)
2L R-range
2M Front speaker output (-)
2N Front speaker output (+)
2O Front speaker input (-)
2P Front speaker input (+)
Terminal
Signals
6-pin connector
3A MIC+
3B MIC-
3C MIC B+
3D GND
3E MIC SENSE
3F –
Terminal
Signal
1-pin connector
4A GPS antenna input
4B GND
2A 2C 2E 2G 2I 2K 2M 2O
2B 2D 2F 2H 2J 2L 2N 2P
3A 3C 3E 3B 3D 3F
4A
4B
3423-1U-06H(09-20).fm 36 ページ ２００６年１１月２１日 火曜日 午後５時４６分