Parking Assist Monitor System System Description

This system has a television camera mounted on the luggage compartment door to display the rear view of the vehicle on the display panel of the multi-display. The display panel also shows a composite view consisting of the rear view and parking guidelines to assist the driver in parking the vehicle by monitoring the rear view.

This system consists of the following components: television camera ECU, television camera, multi-display, and steering sensor.

This system is equipped with a self-diagnosis system, which is operated on a designated window that appears on the display panel, just as in the navigation system.

The television camera ECU controls the system by using information from the following components.

The ECM, through the CAN communication system, inputs the shift lever R position signal from the park/neutral position switch to the television camera ECU when the shift lever is moved to the R position.
After receiving the shift lever R position signal, the television camera ECU changes the display signal for the multi-display from the navigation system to the parking assist monitor system.

In "Parallel Parking Assist Mode", an appropriate steering angle and timing information can be provided for the driver while parking. This is based on the information from the steering sensor signal and the vehicle angle data signal that are sent to the television camera ECU.

HINT:

1. The vehicle speed signal is required to adjust the steering angle neutral point.
   
2. For models other than China models:
   
1. In manual assist mode, the steering sensor signal and the vehicle angle data signal are not used to control parking assist.
   

1. For China models:
   
1. Even in manual assist mode, steering angle data signals are used to control parking assist.
   

The parking assist monitor system communicates with the components via the AVC-LAN. Also "Parallel Parking Assist Mode" judges the vehicle angle data transmitted via the AVC-LAN from the navigation ECU (the data is calculated by the navigation ECU by integrating the yaw rate of the gyro built into the navigation ECU).

The parking assist monitor system has a diagnostic function (displayed in "NAVIGATION SYSTEM" of the multi-display).

A three-digit "unit code (physical address)" number (in hexadecimals) is set in each function of the components that make up the AVC-LAN.

A two-digit "logical address" number (in hexadecimals) is set in each function of the components that make up the AVC-LAN.

What is AVC-LAN?
AVC-LAN, an abbreviation for "Audio Visual Communication Local Area Network", is a united standard developed by the manufacturers in affiliation with Toyota Motor Corporation. This standard pertains to audio and visual signals as well as switch and communication signals.

Purpose:
Recently, car audio systems have rapidly developed and the functions have vastly changed. The conventional car audio system is being integrated with a multimedia interface similar to those in navigation systems. At the same time, customers are demanding higher quality from their audio systems. This is an overview of the AVC-LAN standardization. Its specific purposes are as follows:

1. To solve sound problems, etc., caused by using components of different manufacturers through signal standardization.
   

2. To allow each manufacturer to concentrate on developing products they do best. From this, reasonably priced products can be produced.
   

   HINT:

   1. If a +B or GND short is detected in the AVC-LAN circuit, communication is interrupted and the audio system will stop functioning.
      
   2. If an audio system is equipped with a navigation system, the multi-display unit acts as the master unit. If a navigation system is not equipped, the audio head unit acts as the master unit instead.
      When the audio system is equipped with a navigation system, the multi-display is the master unit.
      
   3. The radio receiver assembly provides resistance to make communication possible.
      
   4. Car audio systems with an AVC-LAN circuit have a diagnostic function.
      
   5. Each component has a specified number (3-digit) called a physical address. Each function has a number (2-digit) called a logical address.
      

Notes for parking assist monitor:

1. The parking assist monitor may not function properly if subjected to a severe impact by any hard object.
   

2. Do not scrub the cover part of the camera (resin made). Scrubbing it may scratch the cover and affect the image. Prevent organic solvents, waxes, bond removing solvents, or glass coating from adhering to the cover. Clean it off immediately and wash with water.
   

3. Exposing the camera to a sudden temperature change may affect proper function.
   

4. A clear image may not appear if the camera is covered with dirt, snow, mud, etc. In such a case, wash the camera with water and wipe it dry. Use detergent to remove the foreign matter if necessary.
   

Images are difficult to discern even in normal conditions if:

1. The camera screen is frosted over (immediately after turning the engine switch on (IG), image may be blurred or darker than normal).
   

2. A strong beam of light, such as a sunbeam or headlight, contacts the camera.
   

   HINT:

   When a strong beam of light, such as a sunbeam reflected off the vehicle's body, contacts the camera, the image may be blurred. This is called a "smear" phenomenon.

3. It is too dark around the camera (at night, etc.).
   

4. The ambient temperature around the camera is either too high or too low.