Missing fuse module nut, what size is it?

[rocco]

Hi Gang

I'm having a bit of a saga with my C4GP. Having driven it home from the seller, it's not moved an inch since!

I originally thought the battery was knackered and so bought a new one in December. It wasn't delivered for 3-weeks so I refused delivery and bought one from somewhere else.

I stuck it in last night but I still have the same problem. The dash lights up, parking brake faulty, I attempt to crank it over but only hear a click. Certainly an electrical fault so I checked all the fuses last night and they were good so had a read on here about BSI reset. That's my job for tomorrow. I'm also to check the earth strap on the gearbox. Other possible culprits are the clutch release bearing, the fuse relay control module, wiring and the parking brake switch.

The other interesting one is to bridge one of the connections to reset the module. There's a video on youtube about it but unfortunately the engine shown there isn't the same as mine. I'm going to search for some clues as to where to jumper/bridge on my car.

I cleared all the fault codes, scanned it again and still have P0500, 7150 & U1313.

However, I noticed a missing nut here which is far from ideal:

I just wonder, while I'm kicking my heels at work today, whether the nut is an M7x1x8,3? Does anyone know? It'll look like this:

Would be great to confirm and order a nut today.

Cheers

[RichardW]

I don't think that's needed, there's no cable connected to it.

[xantia_v6]

That nut is not fitted at the factory, the fuse is for some option that is not fitted to your car.

[rocco]

Thank you for the replies gents, appreciated. That fuse is F12 in the manual for "Wipers" and I definitely have them.

I did the BSI reset today and I'm still stuck in the same position, I only get a click when attempting to start the engine. No crank even with a new, fully charged and tested battery.

On to the next idea....

[Gibbo2286]

Sounds like a duff starter motor, have you checked if there's voltage there?

[rocco]

Sounds like a duff starter motor, have you checked if there's voltage there?

Good shout. I haven't checked but I will. I'll check the fuse first though. Under the bonnet, F8 / 25A

[xantia_v6]

I am sure that fuse is never for the wipers, maybe there is confusion because PSA sometimes have 2 different fuses with the same number.

Can you tell if the click is coming from the starter or a relay in the BSM (engine fuse box).

I don't think that you mentioned which engine your car has.

[rocco]

I am sure that fuse is never for the wipers, maybe there is confusion because PSA sometimes have 2 different fuses with the same number.

Can you tell if the click is coming from the starter or a relay in the BSM (engine fuse box).

I don't think that you mentioned which engine your car has.

It's a 1.6 HDi / UA9HR / DV6C

I'm only going by the owner manual for the fuse layout.

I'm going to remove the fuse box completely tomorrow and check it out. I've seen that they are prone to wet ingress.

[PaulC5]

How many miles / km has the car done ? Have you checked the wiring to the starter motor and the earth strap from the body to the engine/gearbox ?

Instead of removing the fuse box do some tests on the starter motor. Removing it might be best but it may be possible to test whilst still on the car. Do an internet search but it might include some of the following. Make sure the gears are in neutral and handbrake on. If you have access to the starter motor, get somebody to try the ignition switch whilst you listen to it and see if it clicks, if possible hold a length of wood against it and to an ear. If it clicks see if you get 12 volts to the other side of its solenoid - if not the solenoid might have bad contacts inside so then with the ignition key removed try 12 volts direct to the other side of the solenoid and see if the starter turns. If it does not click, remove the ignition key and try 12 volts to the solenoid input connection to bypass the ignition switch and see if it clicks and the starter turns.

[GiveMeABreak]

That will not be the fuse for the wipers - for sure.

PSA have multiple fuse boxes: Several rows of fuses in the BSI (in the passenger glovebox), then there is the engine fusebox that contains another load of fuses and there may be one or more dotted about depending on options and equipment.

What you're looking at in your picture is not the engine fusebox - it is the Supplies Protection and Management Unit and won't contain fuses. The engine fusebox looks like this:

[rocco]

How many miles / km has the car done ? Have you checked the wiring to the starter motor and the earth strap from the body to the engine/gearbox ?

Instead of removing the fuse box do some tests on the starter motor. Removing it might be best but it may be possible to test whilst still on the car. Do an internet search but it might include some of the following. Make sure the gears are in neutral and handbrake on. If you have access to the starter motor, get somebody to try the ignition switch whilst you listen to it and see if it clicks, if possible hold a length of wood against it and to an ear. If it clicks see if you get 12 volts to the other side of its solenoid - if not the solenoid might have bad contacts inside so then with the ignition key removed try 12 volts direct to the other side of the solenoid and see if the starter turns. If it does not click, remove the ignition key and try 12 volts to the solenoid input connection to bypass the ignition switch and see if it clicks and the starter turns.

It's done 100k miles and been regularly serviced all its' life. I do hear a click as soon as I attempt to engage the starter motor but that is all. Start motor fuse is good.

Going to check all the earths now, the one under the bonnet does seem a bit corroded so I'll clean it up and check the strap on the gearbox. Then once that is all fine, I'll measure voltage on the starter motor - once I can find it. Doesn't look like it's easy to access and not being able to drive it, I can't get it up on ramps.

[rocco]

That will not be the fuse for the wipers - for sure.

PSA have multiple fuse boxes: Several rows of fuses in the BSI (in the passenger glovebox), then there is the engine fusebox that contains another load of fuses and there may be one or more dotted about depending on options and equipment.

What you're looking at in your picture is not the engine fusebox - it is the Supplies Protection and Management Unit and won't contain fuses. The engine fusebox looks like this:

That is exactly the fuse box I have, I believe it's part number 9807028780.

I may well be looking at the wrong manual for a C4 Picasso but the one I have does state that F12 is wipers. Either that or I am misreading it somehow.

Many thanks

[RichardW]

F12 for the wipers will be on the BSM that Marc posted a pic of. My 3008 manual suggests that F12 on top of the battery is the power supply for the EGS box when fitted.

On a 1.6 the starter is down the back of the engine, you will only be able to access it from underneath. Is the click you are hearing from the fuse box under the bonnet? This is presumably the starter relay. I think most likely the starter is faulty - it's really hard to change!

This video is fault finding the same fault on the same engine in a slightly earlier Berlingo - the actual wires etc might be different, but the architecture will be the same.

[Steve Walsh]

I think the best thing you can do is access the starter from underneath on ramps or a pit, Check for 12 volts on the main heavy duty cable, but not the one that goes down into the motor, If you have battery voltage there, try a small piece of wire from battery positive to the small terminal on the starter and see if it turns over.
Make sure it is in neutral and brakes on before trying.

[Gibbo2286]

Those guys made a right meal of diagnosing that.