LAND ROVER DISCOVERY 4 2010 L319 BLUETOOTH CONTROL UNIT AH42-10F845-AA

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Genuine Land Rover Discovery 4 L319 Bluetooth Telephone Hands-Free Control Unit – AH42-10F845-AA / LR025842 – 2010

Genuine Land Rover/JLR used Bluetooth control module / telephone hands-free control unit, suitable for selected Land Rover Discovery 4 L319 models equipped with the corresponding factory Bluetooth telephone and infotainment system.

This electronic module forms part of the vehicle’s factory telephone, Bluetooth and multimedia system, allowing compatible mobile phones to communicate wirelessly with the vehicle for hands-free calling and associated telephone functions.

Part Number: AH42-10F845-AA

Alternative Number Format: AH4210F845AA

Land Rover OE / Service Number: LR025842

Part Type: Bluetooth Control Module / Telephone Control Unit / Hands-Free Module

Module Type: Bluetooth Phone Module / Telematics Interface

System: Factory Infotainment / Telephone System

Application: Bluetooth Mobile Phone Connectivity / Hands-Free Calling

Donor Application: 2010 Land Rover Discovery 4 L319 TDV6 HSE

Donor Engine: 3.0 TDV6 – 306DT

Donor Gearbox: ZF 6HP28 Automatic

Manufacturer: Land Rover / JLR

Condition: Used Genuine Land Rover Part

COMPATIBILITY

Land Rover Discovery 4 – L319

Directly confirmed application:

• Discovery 4 L319 – 2010

• Discovery 4 TDV6 HSE

• 3.0 TDV6 – 306DT

• 5-door SUV

• ZF 6HP28 automatic application

• UK RHD application documented

• Factory Bluetooth / telephone-equipped vehicle

The exact AH42-10F845-AA module is documented as removed from a 2010 Discovery 4 TDV6 HSE with the 306DT engine.

MODEL-YEAR COMPATIBILITY

The AH42-10F845-AA module is particularly associated with early Discovery 4 vehicles.

Specialist Discovery technical information identifies:

AH42-10F845-AA – 2010 to 2011 Model Year

Other replacement-module sources document it on approximately:

2010-2012 Discovery 4 / LR4

Therefore, the strongest application for this exact engineering number is the early Discovery 4 L319 Bluetooth system.

ADDITIONAL LAND ROVER / RANGE ROVER COMPATIBILITY

The same AH42-10F845-AA / LR025842 Bluetooth module is also documented on selected:

Range Rover Sport – L320

• Factory Bluetooth-equipped applications

• Selected vehicles through approximately 2013

Range Rover – L322

• Selected factory Bluetooth-equipped applications

The LR025842 service reference is documented for:

• Discovery 4 L319

• Range Rover L322

• Range Rover Sport L320

However, infotainment configuration and software can vary between models.

Cross-model fitment should therefore not be assumed solely because the AH42-10F845-AA number is present.

TECHNICAL INFORMATION

The AH42-10F845-AA / LR025842 is an electronic Bluetooth communications module used within the factory JLR multimedia system.

Its functions include:

• Bluetooth mobile phone pairing

• Wireless communication between compatible phones and the vehicle

• Hands-free telephone calling

• Communication with the factory infotainment system

• Integration with the vehicle’s telephone menu

• Transfer of telephone audio through the factory audio system

• Communication with the vehicle microphone

• Integration with steering-wheel telephone controls where fitted

• Communication with other multimedia modules

• Supporting factory telephone functions displayed through the infotainment system

The module allows the driver to use compatible telephone functions without physically handling the mobile phone.

BLUETOOTH / TELEPHONE SYSTEM INFORMATION

The complete factory Bluetooth telephone system can involve several components, including:

• Bluetooth Control Module – AH42-10F845-AA

• Factory microphone

• Factory radio / infotainment head unit

• Central infotainment display

• Steering-wheel telephone controls

• Audio amplifier depending on specification

• Vehicle speakers

• Multimedia wiring

• MOST fibre-optic network on applicable systems

• Associated vehicle control modules

A failure elsewhere in the system can therefore produce symptoms similar to a faulty Bluetooth module.

MOST FIBRE-OPTIC NETWORK INFORMATION

On appropriately equipped Discovery 4 vehicles, the Bluetooth module forms part of the MOST multimedia fibre-optic network.

MOST stands for:

Media Oriented Systems Transport

The MOST network links various infotainment components together, potentially including:

• Bluetooth telephone module

• Audio amplifier

• Radio/audio components

• Navigation components

• Other multimedia control units depending on specification

Because MOST operates as a network/ring, failure of an individual multimedia module can potentially affect communication with other components.

Discovery 4 owners have specifically documented AH42-10F845-AA within the MOST system, including cases where Bluetooth functionality fails while the fibre-optic loop remains operational.

COMMON SYMPTOMS OF A FAULTY BLUETOOTH MODULE

Replacement may be required due to:

• Phone will not connect to the vehicle

• Bluetooth pairing failure

• Vehicle Bluetooth cannot be found by mobile phone

• Previously paired phone suddenly stops connecting

• Telephone menu not responding correctly

• No hands-free telephone operation

• Bluetooth connection repeatedly disconnecting

• No telephone audio

• Module communication fault

• MOST multimedia communication problems

• Internal electronic failure

• Water / moisture damage

• Damaged module connectors

IMPORTANT DIAGNOSTIC INFORMATION

A Bluetooth connection problem does not automatically mean the AH42-10F845-AA module has failed.

Before replacement, check:

• Mobile phone Bluetooth settings

• Remove and re-pair the phone

• Test with another compatible phone

• Vehicle battery voltage

• Bluetooth module power and ground

• Module electrical connectors

• MOST fibre-optic connections where applicable

• Factory microphone

• Infotainment system operation

• Relevant fuses

• Vehicle diagnostic fault codes

If multiple multimedia components are simultaneously unavailable, the MOST fibre-optic network should also be diagnosed rather than replacing the Bluetooth module immediately.

WATER / MOISTURE DAMAGE INFORMATION

Water ingress has been reported as one possible cause of Bluetooth-module failure on these JLR infotainment systems.

When replacing the module, inspect:

• Module casing

• Electrical connectors

• Connector pins

• MOST connections

• Surrounding wiring

• Module mounting area

Look for:

• Water staining

• Corrosion

• Green deposits on terminals

• Dampness

• Previous water ingress

If moisture is found, the source should be corrected before installing another electronic module.

PART NUMBER INFORMATION

Primary engineering number:

AH42-10F845-AA

Alternative formatting:

AH4210F845AA

Land Rover service/OE reference:

LR025842

These numbers are directly cross-referenced for the Discovery 4 Bluetooth control module.

RELATED / EARLIER MODULE INFORMATION

Another Bluetooth module number encountered on earlier Land Rover/Range Rover infotainment systems is:

8H22-10F845-AA

This should not automatically be treated as identical to AH42-10F845-AA.

Discovery technical information specifically identifies:

AH42-10F845-AA – 2010/2011 model-year vehicle

Different engineering numbers can reflect changes in hardware, software or vehicle infotainment configuration.

For a direct replacement, matching:

AH42-10F845-AA

is strongly recommended.

2010 DISCOVERY 4 DONOR INFORMATION

This exact module number has a documented donor application from:

Land Rover Discovery 4 TDV6 HSE

Manufactured: 2010

Platform: L319

Engine: 306DT – 3.0 TDV6

Gearbox: ZF 6HP28 – 6-Speed Automatic

Body: 5 Door

Steering: Right-Hand Drive

This provides particularly strong evidence for 2010 Discovery 4 L319 compatibility.

INSTALLATION

Installation should be performed according to the appropriate Land Rover/JLR workshop procedure.

During installation:

• Check the replacement module number

• Inspect electrical connectors

• Inspect MOST fibre connections where fitted

• Check the mounting area for moisture

• Check surrounding wiring

• Secure the replacement module correctly

• Reconnect all connections carefully

• Restore battery connection according to JLR procedure

• Test Bluetooth pairing

• Test hands-free calling

• Check microphone operation

• Check steering-wheel telephone controls where fitted

• Perform a diagnostic scan if required

Fibre-optic connections should be handled carefully and should not be sharply bent or contaminated.

PROGRAMMING / CODING

Programming / Configuration May Be Required.

Used-module specialists specifically warn that AH42-10F845-AA may require additional programming when installed into another vehicle.

Other suppliers also describe used AH42-10F845-AA modules as requiring programming.

Therefore:

Programming Required: Vehicle dependent

Configuration Required: Vehicle dependent

Diagnostic Check Recommended: Yes

A direct like-for-like replacement carrying the same number provides the strongest compatibility, but it should not be guaranteed as universally plug-and-play.

JLR-compatible diagnostic equipment may be required to configure or verify the replacement module.

IMPORTANT COMPATIBILITY NOTE

Before ordering, please compare:

AH42-10F845-AA

AH4210F845AA

LR025842

Also check:

• Vehicle model

• Vehicle model year

• Factory Bluetooth/telephone specification

• Infotainment system generation

• Existing module engineering number

• Electrical connectors

• MOST fibre connections where fitted

• Module casing and mounting points

• Vehicle configuration

• Listing photographs

Do not rely solely on “Land Rover Discovery 4” when ordering.

Different Bluetooth and infotainment modules were used across Discovery 4 production.

For a 2010 Discovery 4 L319, AH42-10F845-AA / LR025842 is a directly documented application and matching this number with the original module provides the safest basis for compatibility.

CONDITION

Used Genuine Land Rover / JLR Electronic Module.

Normal cosmetic marks, scratches and signs of previous installation may be present.

Please inspect all listing photographs carefully for the exact AH42-10F845-AA identification, LR number, electrical connectors, fibre-optic connections, mounting points and overall condition.

As this is a used electronic infotainment module, vehicle-specific programming/configuration may be required after installation.

Ideal genuine Land Rover replacement Bluetooth telephone / hands-free control module for a compatible Land Rover Discovery 4 L319 factory infotainment system.