BMW 7 Series: System Components

Control Units, Control Elements and Spindle Drives

Luggage Compartment Lid Lift

The luggage compartment lid lift is fitted on the right-hand side in the luggage compartment floor. The HKL controls and monitors the operation of the automatic luggage compartment lid actuating system.

The control logic module is connected to terminal 30B. The HKL is also connected to terminal 30 for the load current through the spindle drives.

In sleep mode, the HKL requires a certain amount of closed-circuit current. With terminal 30B OFF, the HKL is no longer supplied with off-load current.

NOTE: Terminal 30B is switched off with a delay.

The luggage compartment lid lift operates at a voltage of between 9 V and 16 V. Outside this range, the functions may no longer be supported.

Fig. 43: Identifying Luggage Compartment Lid Lift Control Units, Control Elements And Spindle Drives

COMPONENTS DESCRIPTION CHART

1. Not for US market
2. Not for US market
3. HKL control module

Car Access System

The Car Access System is fitted next to the steering column. It is the master control unit for the central locking.

It is therefore also responsible for having the luggage compartment lid unlocked.

Junction Box Electronics

The junction box electronics are connected to the front power distribution box.

NOTE: The power distribution box and the junction box electronics are two separate components. This is an important point for the Service to note.

The central locking of the luggage compartment lid is controlled by a power output stage in the junction box electronics. The automatic soft-close drive is supplied by a relay in the distribution box at the rear. The junction box electronics control the relay.

Control Elements

Outer Luggage Compartment Lid Button

The outer luggage compartment lid pushbutton switches to ground. The signal from the outer luggage compartment lid button is sent to the junction box electronics. The junction box electronics signal the status of the outer luggage compartment lid button to the luggage compartment lid lift.

Interior Luggage Compartment Lid Button

The luggage compartment lid button switches to ground. The signal from the luggage compartment lid button is sent to the junction box electronics. The junction box electronics signal the status of the luggage compartment lid button to the luggage compartment lid lift.

The lighting of the luggage compartment lid button is only supplied with power under the following conditions:

• Luggage compartment lid open and
• Terminal 30B ON.

NOTE: A command sent from the inner luggage compartment lid button can only be executed with the luggage compartment lid open. This is due to the fact that the button has a connection to ground via the luggage compartment lid contact switch only when the luggage compartment lid is open.

Central Double-lock Button

The central double-lock button is connected to the Car Access System and switches to ground. The Car Access System makes the button status available on the K-CAN2.

NOTE: A command sent from the central double-lock button can only be executed with the luggage compartment lid open. This is due to the fact that the button has a connection to ground via the luggage compartment lid contact switch only when the luggage compartment lid is open.

ID transmitter luggage compartment lid button

The status of the luggage compartment lid button on the identification transmitter is evaluated by the electronics in the identification transmitter.

The identification transmitter sends an encrypted message to the vehicle by radio wave. The message reaches the remote control receiver via the antenna in the rear window. From there, the message is made available to the Car Access System.

The Car Access System verifies the message. Once the message has been successfully verified, the Car Access System sends out the request on the K-CAN2.

Luggage compartment lid button, A-pillar

The luggage compartment lid button is resistance-coded. The status of the luggage compartment lid button is evaluated by the Car Access System. The Car Access System issues the status on the K-CAN2.

Lock barrel, luggage compartment lid

The lock barrel in the luggage compartment lid is connected to the luggage compartment lid locking mechanism by means of a bowden cable. When the bowden cable is operated with the mechanical key, the luggage compartment lid lock releases and the luggage compartment lid can be opened.

NOTE: Opening the luggage compartment lid with the mechanical key can trigger an alarm in the anti-theft system.

Spindle Drives

Each spindle drive comprises the following components:

• Spindle drive
• Drive motor
• Drive motor Hall sensor
• Spring
• Fixture of the spindle drive to the luggage compartment lid
• Fixture of the spindle drive to the body
• Ball bearing for the spindle drive.

NOTE: A defective spindle drive must be replaced as a complete unit.

Luggage Compartment Lid Contact Switch

The luggage compartment lid contact switch is switched to ground while the luggage compartment lid is not open. The status of the luggage compartment lid contact switch is evaluated and made available by the junction box electronics.

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