SSM73678 Service Bulletin/Repair Instructions

2/1/2018
SSM73678 - Unexpected noise from Head Up Display (HUD) when active | TOPIx
Reference
SSM73678
Models
Range Rover / L405

Range Rover Evoque / L538

Range Rover Sport / L494
Title
Unexpected noise from Head Up Display (HUD) when active
Category
Electrical
Last modified
31-Jan-2018 00:00:00
Symptom
204000 Instrumentation
Attachments
HUD Noise.m4a
Content
Issue:

Unexpected noise from Head-Up Display (HUD)

Cause:

A small number of units were manufactured with inadequate

lubrication of an internal rotating component

Action:

Step 1

Start engine

Confirm HUD is enabled and display is visible

Listen for noise from HUD

Compare a noises with attached sound file

If noise matches sound file then replace HUD

If noise does not match sound file then proceed to step 2

Step 2

Disconnect the HUD Cooling Fan flylead (Please refer to the

Head Up Display Cooling Fan Motor Removal Instructions in

section 413-08 of the Workshop Manual).

Start engine

Listen for noise from HUD

If the noise is not now present, reconnect the HUD Cooling fan

Flylead, and re-check for the noise.

Please note

The HUD cooling fan will produce noise when active.

The HUD cooling fan will typically be active in high ambient

temperatures (>45°C/113°F)

The HUD cooling fan may be active for up to 25 minutes

· If the HUD cooling fan operates for more than 25 minutes this
https://topix.jaguar.jlrext.com/topix/content/document/view?id=881193
indicates a fault in the wiring or head up display cooling fan control
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2/1/2018
SSM73678 - Unexpected noise from Head Up Display (HUD) when active | TOPIx
module (HUDCFCM) in the workshop manual)

The HUDCFCM will store Diagnostic Trouble code U3000-49 in

the event than an internal Electronic Failure has occurred. The

HUDCFCM should be replaced if this Diagnostic Trouble Code

has been stored.

The HUD Cooling Fan will operate when a voltage >0V is

present at the fan control pin (C2MC56AMD-2: see vehicle wiring

diagram). Disable the Head-Up Display via the Instrument Cluster

menu, and probe this pin in line with the procedure detailed in the

workshop manual, section 418. If a voltage >0v is present, an

electrical short circuit is present in the wiring harness, and should

be investigated further.

In the event that a voltage >0v is not present, an internal fault with

the HUD cooling fan is likely, and the module should be replaced.

· If the HUD cooling fan operates for less than 25 minutes please

explain to the customer that this noise is normal
Technicians - Please rate this SSM and provide comments so that

future communications can be improved.

1 = Poor – Basic information provided – The SSM does not help me

resolve the customer concern.

3 = Average – Adequate information provided – The SSM partially

helps me resolve the customer concern.

5 = Excellent – All required information provided to resolve the

customer concern.
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