Vehicle & Technical > Discovery

DII Speedo

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browng5:
The odometer part of the speedo on my 99MY DII has gone blank. I still have the trip mileage and the speedo reads ok when compaered to my GPS (2-3mph out).
This happened at the weekend under normal driving conditions. The car has done 75,500 miles.
Anyone any ideas?

Graeme

Ricky:
On the disco 11 the instrument pack is controled by the BCU 'body control module'. The instrument pack itself is fully electronic so difficult to fix. If you know anyone with testbook or equivalent you could check the BCU is configured correctly even if its correct reconfigure it anyway incase its just a glitch. You can sometimes get problems if someone has accessed the BCU for other reasons such as fob programming. Has any work been undertaken on the BCU??

browng5:
Ricky,

The BCU hasn't been touched, . Do you know if the LCD display can be replaced on its own, or is it the whole instrument pack? Thinking about trying to source a 2nd hand instrument pack and plugping  it in.

Graeme

Ricky:
Dont know if just the lcd can be swapped. you could try unplugging the instrument pack and plugging it in again, a bit like a pc reboot.
If you replace the whole unit the milage ect will not match the milage stored in the Bcu so will need to be sincronised using test book or rovacom, otherwise it will keep flashing a warning to you.

Ricky:
Heres a bit more info for you
Whenever the ignition is turned from position I to position II, the instrument pack and the BCU compare their stored values. If the instrument pack detects that the values are different, it will ‘flash’ the odometer. The odometer will continue to flash until the values have been synchronised. Both units continue to record any distance travelled by the vehicle, even when the display is flashing. If the need arises to change either the BCU or the instrument pack, the new unit will require synchronisation with the existing unit. The value can be synchronised only in an upward direction (the higher of the two values is stored in both units, with the one exception detailed in the next paragraph). Synchronisation of the values can be achieved using TestBook.

If necessary, the odometer readings stored by the BCU and the instrument pack can be reset to 0 kilometres (0 miles) using TestBook. This operation can be carried out only once and then only in circumstances where the current reading is below 160 kilometres (100 miles). This feature is designed to provide dealers with the opportunity of delivering New Discovery vehicles with 0 kilometres (0 miles) displayed on the odometer. This can be carried out after the pre-delivery inspection, once the delivery mileage has been recorded. It should be noted that the values stored by the BCU and the instrument pack must be reset. If only one value is reset then the odometer will flash a miss-match warning, as previously described (depending upon market specification).

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