Integrated Head Unit

INTEGRATED HEAD UNIT





The high line head unit contains the following functionality:
^ Radio tuner.
^ CD player (Six disc in dash changer).
^ Integrated telephone control.
^ Auxiliary input (for any device featuring a 3.5mm jack plug output).

The IHU (Integrated Head Unit) unit also integrates with the navigation system, this requires the addition of a navigation computer, touch screen display and GPS antenna.

The IHU is woken up by CAN bus activity and is not woken up from the ignition aux position.

The IHU is the Bus Master for the MOST system and contains the timing master for the MOST system.

Connector C1354 Pinout Table For High Line Audio

Connector C1354 Pinout Table For High Line Audio:

Connector C2115 Pinout Table

Connector C2115 Pinout Table:

Tuner
The IHU incorporates a AM/FM tuner which allows for 18 FM pre-sets and 12 AM (6 MW and 6 LW) pre-set stations to be stored in the IHU memory. The radio tuner also incarcerates the following radio functions:
^ Auto tune
^ Traffic announcements (TA)
^ RDS EON function
^ Seek station
^ Tune up/down

CD Player
The CD player is a 6 disc in dash mounted device. The CD multi changer is capable of playing commercial CDs, CDRs, CDRWs and MP3 discs.

Random Play
The Random feature only works on the CD, which has been selected. The Random feature plays all the tracks on the selected CD in a random order. All the tracks on that disc will be played before a new random sequence is played. If a new CD is selected while in random mode, the random mode will be cancelled and play will commence from track 1.

Repeat
The Repeat feature allows the current track to be repeated in an endless loop, when selected by the user.

MP3
The CD player has the capability to play MP3 files. The MP3 discs follow a format of folders and files within the folder. It is also possible to place all the files in the root directory on the CD.

The random and repeat features follow the normal CD random and repeat feature functions.

Scan
Scan allows the user to play the first 10 seconds of each track on the CDs in the unit.

Automatic Volume Control - AVC
The AVC feature is designed to adjust output volume to compensate for the rising level noise of the vehicle as the vehicle travels faster.

There are 10 settings for AVC, where 0 = off, 1 is the lowest setting (minimum volume change with speed and 9 the maximum).

The vehicle speed signal is used to enable the IHU to calculate the volume adjustment required. The vehicle speed signal is received over the CAN from the ABS control module. The signal is an average of the four wheel speed sensor signals.

Control of the AVC is carried out by the audio amplifier.

Should an invalid speed signal be received the AVC will not alter the output volume.

IHU Diagnostics
The IHU has built in diagnostics functions accessed via hidden menus, to enable the technician to diagnose problems with the system. The diagnostics are grouped into three areas:
^ Security
^ Set-up

Access to the hidden menus, to he functions within the menus are not intended to give direct control to the customer and should, where possible, kept transparent.

The following sequence outlines the process of entering and navigating through the Menus.

NOTE:
^ Exiting the hidden menu is achieved by turning the unit OFF, via the On/Off button at any time.
^ Head unit is assumed to be in OFF condition.
^ Press ON/OFF button.
^ Within 5 seconds press and hold the On/OFF button for 10 seconds to access the SECURITY menu.
^ A short press of the FF button (<2seconds) enters the SET-UP1 menu.

Exiting the hidden menus can be achieved at any time by pressing the ON/OFF button.

The following table details the hidden menus. Each screen is broken down into greater detail, within the relevant Hidden Menu Type.

IHU Menu Screens





In the security menu the only buttons that function are:
^ Volume
^ Fast forward
^ Fast rewind

In the Set-Up Menus, the only buttons that function are:
^ Volume
^ Fast forward
^ Fast rewind
^ Source
^ Seek

In the test menu the only buttons that function are:
^ Volume
^ Fast forward
^ Fast rewind
^ Source
^ Seek