Multiple dashboard waring lights.

Hey guys
I am hoping somebody can help me I have a citroen c3 2010 exclusive 1.6 hdi. My problems started about two three weeks ago got into the car went to start car and my wipers were going crazy headlights on and car would not start with alot of warnings coming up on dash such as braking faulty, airbags faulty, anti theft faulty and seatbelts faulty. Following this I decided to send the ecu off for testing and has come back no fault I have also checked fuses and I am now absolutely lost

Stuart9 wrote: ↑Thu Mar 11, 2021 2:46 pm Hey guys
I am hoping somebody can help me I have a citroen c3 2010 exclusive 1.6 hdi. My problems started about two three weeks ago got into the car went to start car and my wipers were going crazy headlights on and car would not start with alot of warnings coming up on dash such as braking faulty, airbags faulty, anti theft faulty and seatbelts faulty. Following this I decided to send the ecu off for testing and has come back no fault I have also checked fuses and I am now absolutely lost

Hi

This doesn't sound like the ECU at fault, don't send that off.

It also doesn't sound like is BSI fault, don't send that off.

What it does sound like is a poor voltage to the computers, something like a failing battery would give.

Engine didn't start - Did it turn over?

No didn't crank over all I hear is a click coming from fusebox I have ordered a new battery now got old one checked and come up as replace

Changed battery no joy still same problem

Stuart9 wrote: ↑Thu Mar 11, 2021 5:15 pm No didn't crank over all I hear is a click coming from fusebox I have ordered a new battery now got old one checked and come up as replace

No click,click,click,click of the solenoid on the starter motor?

No solenoid and no starter can be a very bad battery,

Stuart9 wrote: ↑Fri Mar 12, 2021 3:14 pm Changed battery no joy still same problem

OK, so the battery is ok.

But it won't turn over, not even click, click, click the solenoid

Bad earth from the battery
Bad starter
Bad ignition switch
Blown starter fuse (linked to bad starter) - F8 20A in the engine bay (probably)


Do you still get the erroneous warning lights on the dashboard?

No click from starter checked battery earth. And checked fuses but will check them again. Makes me wonder if problem with fusebox hopefully not. Ony thing not check is starter

And has now gone into economy mode with a new battery

I don't have a circuit diagram for the modern C3's but on the older cars the starter solenoid for manual cars ran straight from the ignition switch.
From maxi fuse #7 to the key then (basically) straight to the starter solenoid. The connection did go through the BSM but straight through. No relays or whatever.

The auto's and sensodrive cars had an interlock relay that sits just above the ABS ECU in the near side wing.

Again, not familiar with later model C3's, do you need to push on the brake or clutch to start the car? If not, then there is no interlock and the BSI and/or BSM are not involved.

You say you checked the battery earth do you mean the cable from the battery to the chassis and from the chassis to the gearbox?

Maxi fuse #7 powered everything connected to the ignition switch. So if you turn the switch and something happens then maxi fuse #7 is OK. If modern cars run the same system.

Stuart9 wrote: ↑Sat Mar 13, 2021 10:43 am And has now gone into economy mode with a new battery

Any car will remain in economy mode until the engine runs.

Yes, I know...catch 22.

I think all the problems are related to a single fundamental problem.

Check the earths as I said.

Check the cable that goes from the battery to the stud inside the fuse box in the engine bay. Check that the cable is firm under the nut and there is no corrosion.