Thread: TD5 Flashing B on dashboard

There are cases when corrosion is visible and others when not cos the fault can be between those two pcbs where you have no access, when it's visible it's simple but you can't visually rule out that fusebox just cos you cant eyeball a problem, the only 100% way to rule it out is by replaceing it with a known good one, it's plug and play... if that doesnt help the next suspect is the BCU which needs complex programmimg with nanocom or similar.. there is a huge variety of symptoms which can be together with that crossed B, no clerar pattern

PS the missing relay is for V8's ignotion coils

Originally Posted by Henryque

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Just checked fuse box and no sign of corrosion

I find there is one relay missing at this point below, is it correct or it must have an relay here ?

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When I got my D2, the fuse box was damaged, around the 6, 7 area, nothing apparent except one of the sunroofs wouldnt open, interior lights not working a few other little things. It does not seem this is your issue per se.

Just be careful with the two brown connectors when putting it back in, it is tight and fiddly and the smaller brown connector fits in the larger connector space, my first rookie mistake - the TD5 is same fusebox the V8, you have to make sure the same fuse positions are used as they use different fuses and relays usage dependent on the engine.

The fuse boxes though are not interchangeable between the D2 and D2a, the easiest way of course then is to find a fuse box with the same engine and series and use that as a check.

The standard radios and the Harmon Karmon head units are Alpine, no problem there.

The red light is normal as to the alarm system being operational


Have you checked the wiring loom between the ECU (behind the battery) to the rocker cover for oil ingress, simply job to do, just remove the loom at the ECU and check if you see any signs of engine oil...

Originally Posted by RRT

When I got my D2, the fuse box was damaged, around the 6, 7 area, nothing apparent except one of the sunroofs wouldnt open, interior lights not working a few other little things. It does not seem this is your issue per se.

Just be careful with the two brown connectors when putting it back in, it is tight and fiddly and the smaller brown connector fits in the larger connector space, my first rookie mistake - the TD5 is same fusebox the V8, you have to make sure the same fuse positions are used as they use different fuses and relays usage dependent on the engine.

The fuse boxes though are not interchangeable between the D2 and D2a, the easiest way of course then is to find a fuse box with the same engine and series and use that as a check.

The standard radios and the Harmon Karmon head units are Alpine, no problem there.

The red light is normal as to the alarm system being operational

Have you checked the wiring loom between the ECU (behind the battery) to the rocker cover for oil ingress, simply job to do, just remove the loom at the ECU and check if you see any signs of engine oil...

Checked ECU conectors and no sign of oil

I'm thinking about removing xyz switch and open it to check if is it 100%, but since my dashboard doesnt appear any "M and S" signal im a little affraid of doing it in vain, since it is hard to access and difficult

Originally Posted by Henryque

Checked ECU conectors and no sign of oil

I'm thinking about removing xyz switch and open it to check if is it 100%, but since my dashboard doesnt appear any "M and S" signal im a little affraid of doing it in vain, since it is hard to access and difficult

For ths particular fault with the crossed B i am 100% sure that you'd work with the XYZ switch in vain

Originally Posted by sierrafery

For ths particular fault with the crossed B i am 100% sure that you'd work with the XYZ switch in vain

Oh, good to know !

One question, that "blinking odometer mileage" for few seconds after first start has something to do with the BCU issue you mentioned ?

Also that crossed B influanciates on vehicles performance? As i reported on first post

Originally Posted by Henryque

Oh, good to know !

One question, that "blinking odometer mileage" for few seconds after first start has something to do with the BCU issue you mentioned ?

Also that crossed B influanciates on vehicles performance? As i reported on first post

That crossed B can have a huge variety or symptoms especially if it's triggered by the BCU and in your case it might be as the BCU is in close relation with the autobox management

I inserted fusebox back to its place and did some tests just for checking some details to add at this thread

After inserting back the fusebox to its place and start the vehicle i noticed that only the odometer milleage blinks, and no sign of crossed B on dashboard, which appears the letter " P " , and just after moving the gearbox lever to the " N " position it appeared the letter " N " and 2 seconds later just started to show the blinking crossed B on dashboard, in any gear selected.

Obs: all eletrical functions inside the car works normaly.

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IMO the BCU is at fault