Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Navigation System
The navigation system module controls the operation and the interface between the user, the vehicle subsystems, and the external components. The navigation system module is on the standard corporate protocol (SCP) network and can be diagnosed with a diagnostic tool. Communication through the controller area network (CAN) utilizes data transmitted and received between the navigation system module and the audio unit to control the video screen display through the video interface circuits.
The vehicle navigation system guides the user to a pre-entered destination. A map DVD stored in the navigation system module sends route calculation data to the audio unit. The audio unit audibly and visually instructs the user of the maneuvers required to arrive at the destination entered.
A voice recognition system allows the user to interface with the system without using the touch screen. A microphone located in the rear view mirror provides a direct input to the navigation system module.
The navigation system module uses the GPS antenna, vehicle speed, and other internal sensor information to accurately establish vehicle position. In order to calculate the initial vehicle position, the GPS antenna is used to track several available satellites simultaneously. The GPS antenna only receives data and does not communicate with the satellites. A gyroscope integral to the navigation system module monitors the pitch and yaw of the vehicle created during cornering or turning. A hardwired vehicle speed input from the anti-lock brake system (ABS) module and a reverse input from the digital transmission range (TR) sensor through the SCP network are also used to detect vehicle speed and direction changes.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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