Multifunction Electronic Modules Land Rover Range Rover L322

Scheme 46

GENERAL

The generic electronic module (GEM) centralizes the control of several body systems, reducing electrical complexity and increasing overall system reliability. The generic electronic module (GEM) controls the routines of the following systems

1. Anti-theft alarm system. Refer to «ANTI-THEFT - ACTIVE»(/land-rover/range-rover/l322-2005-2009/remont/door-locks-anti-theft-systems/#anti-theft-active) .
2. Car/Key Memory.
3. Central locking system and child safety lock. Refer to «ANTI-THEFT - PASSIVE»(/land-rover/range-rover/l322-2005-2009/remont/door-locks-anti-theft-systems/#anti-theft-passive) .
4. Glove box actuator. Refer to «INSTRUMENT PANEL»(/land-rover/range-rover/l322-2005-2009/remont/gauges-instrument-panels/#instrument-panel-and-console) .
5. Door mirror control Refer to «REAR VIEW MIRRORS»(/land-rover/range-rover/l322-2005-2009/remont/heated-glassdefoggers/#rear-view-mirrors) .
6. Headlamp washers. Refer to «WIPERS AND WASHERS»(/land-rover/range-rover/l322-2005-2009/remont/wiperwasher-systems/#wipers-and-washers) .
7. Interior lighting Refer to «INTERIOR LIGHTING»(/land-rover/range-rover/l322-2005-2009/remont/interiorillumination-lights/#interior-lighting) .
8. Load disconnection
9. Roof opening panel Refer to «ROOF OPENING PANEL»(/land-rover/range-rover/l322-2005-2009/remont/sun-rooft-topconvertible-top/#roof-opening-panel) .
10. Approach Lamps Refer to «EXTERIOR LIGHTING»(/land-rover/range-rover/l322-2005-2009/remont/exterior-lights/#exterior-lighting) .
11. Window regulators Refer to «GLASS, FRAMES AND MECHANISMS»(/land-rover/range-rover/l322-2005-2009/remont/windows/#glass-frames-and-mechanisms) .
12. Windshield wipers and washers. Refer to «WIPERS AND WASHERS»(/land-rover/range-rover/l322-2005-2009/remont/wiperwasher-systems/#wipers-and-washers) .

The vehicle type, equipment configuration and market specific features are specified to the generic electronic module (GEM) by means of coding data via the diagnostics interface.

Load switching circuits for currents less than 10 Amps consist of semiconductor switches within the generic electronic module (GEM). The load switching circuits for the headlamp and windshield wipers are subjected to a greater degree of loading (number of operating cycles and current loading), so the switching is performed outside the generic electronic module (GEM) by relays.

CAR/KEY MEMORY

The car memory contains vehicle function settings that can be changed to suit market and customer preferences. In some markets, some of the functions in the vehicle memory are blanked out due to marketing and statutory requirements. Where available, the settings can be changed using the Land Rover approved diagnostic system.

The key memory is based on the vehicle memory, and contains function settings that can be personalized to an individual driver. Different drivers are recognized indirectly through the remote control transmitter in the key. Up to 4 different keys can be recognized by the generic electronic module (GEM). The key memory settings can be changed using Land Rover approved diagnostic system.

The generic electronic module (GEM) broadcasts driver recognition on the P bus and the K bus to the following control modules, which also contain personalized key memory settings

1. Driver door module, for memorized door mirror settings
2. Memory control module, for memorized driver's seat and steering column settings
3. Radio, for memorized tone, audio source and station settings.

The driver recognition messages contain the key number, the button pressed on the remote control and whether the key is valid or not. The key number is contained in the unlock transmission of the remote control keys, so personalized settings are only recalled after the vehicle has been unlocked with the remote control of one of the key numbers stored in the key memory. If the vehicle is unlocked with the key in the driver's door lock, the generic electronic module (GEM) identifies the key as invalid and control modules with personalized settings recall the last used setting. The generic electronic module (GEM) outputs the driver recognition message when it detects

1. An 'unlock' command from a remote control (the signal is sent immediately so that the correct positions for seat, door mirrors and steering column can be set)
2. Any other actuation by remote control (when the remote control 'lock' command is detected, seat motion to a memorized position is stopped)
3. Operation of the central locking system by other than a remote control
4. A change of state of the ignition switch
5. A driver recognition enquiry from another control module.

The seat and steering column memories are coded with an automatic movement option for the driver's seat, door mirrors and steering column. The options are

1. No automatic setting
2. Automatically setting the positions in response to the remote control 'unlock' command
3. Automatically setting the positions in response to the remote control 'unlock' command and opening of the driver's door.

Automatic movement of the seat can be stopped by pressing the remote control 'lock' button or any of the seat adjustment or memory switches. Automatic movement can be restarted by pressing the remote control 'lock' button again. Pressing the 'unlock' buttons (for selective central locking) and 'unlocking the boot' does not stop automatic seat movement.

Storage of personalized settings is automatically updated for each setting change provided a valid remote control key has been detected (interruption of the automatic recall movement of the driver seat, door mirrors and steering column is not interpreted as a setting change). The last setting for the recognized driver is automatically stored in the key memory area of the corresponding control module. If no valid remote control key has been detected, setting changes are stored in a recall memory for retrieval when an invalid key is detected.

The following table contains the car and key memory functions that can be changed (depending on market) using the Land Rover approved diagnostic system.

LOAD DISCONNECTION

The generic electronic module (GEM) supplies various electrical loads on the vehicle, such as the glove compartment lamp, reading lamps, luggage compartment lamps, etc., that can be switched on and remain on when the vehicle is parked. A central load disconnection feature in the generic electronic module (GEM) ensures the battery is not discharged in the event these loads are switched on continuously. The trigger time after the ignition is switched off is 16 minutes and is independent of the sleep mode timer.

The generic electronic module (GEM) disconnects the following loads while the engine cranks, to maximize the available power from the battery

1. Wipers
2. Washer pump
3. Headlamp cleaning
4. Window regulators
5. Roof opening panel.

If the one-touch function of a window or the roof opening panel is active before the load disconnection, the function is not continued when engine cranking stops.

SLEEP MODE

To conserve power, the entire generic electronic module (GEM) goes into a 'sleep' mode 16 minutes after signal activity ceases and the ignition is switched off. The typical current consumption of the generic electronic module (GEM) in sleep mode is 1.25 mA. In the sleep mode the generic electronic module (GEM) is in a limited operational mode from which it can be awakened by certain relevant wake-up signals. After being awakened, the generic electronic module (GEM) remains awake for 1 minute if no action is triggered. If an action is triggered, the generic electronic module (GEM) remains awake for at least 16 minutes.

The generic electronic module (GEM) wakes up when it receives a signal from any of the following

1. The K bus
2. Any door status switch (driver, front passenger, left-hand (LH) and right-hand (RH) rear doors)
3. Hood ajar switch
4. Central locking switch
5. Driver's door lock cylinder lock switch
6. Driver's door lock cylinder unlock switch
7. Interior lamp switch
8. Lower tailgate opening switch
9. Tilt alarm sensor
10. Ultrasonic sensor
11. Upper tailgate opening switch
12. Upper tailgate status switch.

DIAGNOSTICS

Diagnostic monitoring is included in the operating software of the generic electronic module (GEM) and is performed on a continual basis. All of the input and output signals which are relevant for diagnostics can be read out and injected using the Land Rover approved diagnostic system. Detected faults are stored in the non volatile electrically erasable programmable read only memory (EEPROM) of the generic electronic module (GEM).

All faults stored by the generic electronic module (GEM) are stored chronologically, with a fault counter, in a fault or information area of the memory. Faults which positively point to one or more defective components are stored in the fault area. Faults which do not positively point to a defective component are stored in the information area to provide information during troubleshooting. The generic electronic module (GEM) ignores faults detected within 32 seconds of power up or when battery voltage is less than 9V.

A distinction is made between sporadic and static faults. Sporadic faults are those which have occurred at least once, and the cause of the fault message was no longer present at least one time. Static faults are faults which are still active at the time diagnostics are performed.

The generic electronic module (GEM) can store up to 30 faults at any one time. If further faults are detected following the 30th fault they are ignored. Faults can only be erased using the Land Rover approved diagnostic system.

Up to 16 faults stored by the generic electronic module (GEM) are also stored in those modules connected to the generic electronic module (GEM) via the P bus, i.e. the driver and passenger door modules and the roof opening panel module. Faults stored in the peripheral modules cannot be accessed via the diagnostic socket. The faults in the peripheral modules are used for diagnosing modules after they are removed from the vehicle.

Scheme 47

1. Move the passenger seat cushion fully rearwards.
2. Remove the Generic Electronic Module (GEM) access panel. Release the 2 clips.
3. Move the passenger seat cushion fully forwards.
4. Disconnect the battery ground cable. Refer to «SPECIFICATIONS»(/land-rover/range-rover/l322-2005-2009/remont/charging-system/#charging-system-general-information__specifications) .
5. Remove the GEM. Disconnect the 3 electrical connectors.

INSTALLATION

1. Install the GEM. Connect the electrical connectors.
2. Connect the battery ground cable. Refer to «SPECIFICATIONS»(/land-rover/range-rover/l322-2005-2009/remont/charging-system/#charging-system-general-information__specifications) .
3. Move the passenger seat cushion fully rearwards.
4. Install the GEM access panel. Install the clips.

Scheme 48

Scheme 49

Scheme 50

Scheme 51

Scheme 52

1. Disconnect the battery ground cable. Refer to «SPECIFICATIONS»(/land-rover/range-rover/l322-2005-2009/remont/charging-system/#charging-system-general-information__specifications) .
2. Remove the access panel from the loadspace trim panel LH.
3. Remove the loadspace trim panel, floor stowage compartment LH access cover.
4. Raise and support the spare tire loadspace trim panel.
5. Remove the LH finisher trim panel. Remove the luggage tie down ring. Remove the 2 turn fasteners securing the LH finisher trim panel.
6. Remove the lower turn fastener, securing the front loadspace trim panel LH.
7. Remove the trim clip securing the front loadspace trim panel LH to the floor stowage compartment.
8. Remove the LH floor stowage compartment. Remove the 3 nuts.
9. Remove the information and entertainment module upper bracket. Remove the 2 bolts. Remove the 2 screws.
10. Release the information and entertainment module from its lower locating bracket.
11. Remove the information and entertainment module. Disconnect the optical connector. Disconnect the 7 electrical connectors.
12. Remove the information and entertainment module lower bracket. Remove the 2 screws.

1. Install the information and entertainment lower bracket. Install the screws.
2. Install the information and entertainment module. Connect the optical connector. Connect the electrical connectors.
3. Install the information and entertainment module upper bracket. Tighten the bolts to 10 Nm (7 lb.ft).
4. Install the LH floor stowage compartment. Install the nuts.
5. Install the trim clip securing the front loadspace trim panel LH to the floor stowage compartment.
6. Install the lower turn fastener, securing the front loadspace trim panel to the floor stowage compartment.
7. Install the LH finisher trim panel. Install the turn fasteners.
8. Install the luggage tie down ring. Tighten the bolt to 25 Nm (18 lb.ft).
9. Lower and secure the spare tire loadspace trim panel.
10. Install the loadspace trim panel, floor stowage compartment LH access cover.
11. Install the access panel to the loadspace trim panel LH.
12. Connect the battery ground cable. Refer to «SPECIFICATIONS»(/land-rover/range-rover/l322-2005-2009/remont/charging-system/#charging-system-general-information__specifications) .
13. Using the Land Rover approved diagnostic system, follow the on-screen instructions and configure the information and entertainment module.

Scheme 53

1. Remove the access panel from the loadspace trim panel LH.
2. Release the multifunction voice activated module. Remove the 2 nuts.
3. Remove the multifunction voice activated module. Disconnect the electrical connector.

1. Install the multifunction voice activated module. Connect the electrical connector.
2. Secure the multifunction voice activated module. Tighten the bolts to 6 Nm (4 lb.ft).
3. Install the access panel to the loadspace trim panel LH.

See also:
• ANTI-THEFT - ACTIVE
• ANTI-THEFT - PASSIVE
• INSTRUMENT PANEL
• REAR VIEW MIRRORS
• WIPERS AND WASHERS
• INTERIOR LIGHTING
• ROOF OPENING PANEL
• EXTERIOR LIGHTING
• GLASS, FRAMES AND MECHANISMS
• SPECIFICATIONS