Thread: Disco 4 2010 2.7L Clock won't stay on 12H time setting.

Strange fault that I thought I'd throw out there. Every time I restart my car my clock reverts to 24hour time. I keep resetting it to 12 hour time but without doubt it reverts back. Anyone come across anything like this?

Hi,

Not sure if you are still wrestling with this issue but in the hunt for an explanation for my own vehicle's problems the following technical bulletin issued by Land Rover in 2013 was brought to my attention:

Special Service Message SSM61297:

"Reference Models

Title Category Last modified Symptom Content

SSM61297

LR4 / L319
Range Rover / L322 Range Rover Sport / L320

Clock resets to default value 12.00am and date 01/01/2009 Electrical
24-Jan-2013 00:00:00
204000 Instrumentation

Issue: A customer may report that intermittently the Instrument Pack clock changes setting to read time12.00am and date 01/01/2009 or the time remains correct but switches between a 12hr /24hr format and vice versa when not requested or changes from MM/DD/YY// DD/MM/YY format and vice versa when not requested.

Cause: Body Control Module (BCM) intermittently resets to the default value. Action: Carry out the following steps:

1. Check that the concern is not as a result of intermittent low battery voltage by testing the battery and all power and earth connections. Rectify if necessary.

2. Check that the power and earth connections to the Body control Module have good continuity and correct readings. Rectify if necessary.

3. If no fault is found with steps 1 to 2, replace the Body Control Module if the vehicle is within the VIN range below.

Discovery/LR4 AA 528840–CA623748 Range Rover Sport AA 233855– CA749082."


My vehicle's problems go further so replacing the BCM (apparently part of the Central Junction Box (CJB - don't you just love all these acronyms)) will be necessary. I gather this will be an expensive exercise so you may prefer to live with the 24hr clock.