3200 electical diagnostics

Almichie

Junior Member
Messages
799
So in an attempt to assist other 3200 users going forward I thought I would create a thread which I will update as I find and hopefully fix the issue(s) I currently have.

The fault developed on my way to work on Friday, the journey was normal up to the point when I got to work and the "slow down" lamp followed by the "check engine light" lit up. the car ran faultlessly for the journey and continued to run normally during idle. the car was switched off with the hope that it would "sort it self out" when it cooled. I came out at lunch time and the start sequence started and the beeps passed, upon turning the key...nothing, not a click. the "slow down" and "check engine" lamps re-lit and the RAC were called. the car was recovered and this is where my work begins.

Oddly when the ignition was switched on the side lights lit, with or without them being switched via the stalk. the rear fog lights were also lit initially.

a battery reset was carried out and now I have;

the front fog lights are on as soon as ignition position is made (no longer the side lights and rear fogs), the rear demister (actually this is on all the time not dependant on ignition position) on, no rear lights at all (side or fogs), no wipers, no outside temperature, the "ERORR" sign on the dash and the airbag light lit. the parking light switch now switches the front fog lights on, not the side lights, no air conditioning at all (no fan or functionality). The front and rear fog lights plus demister indicator LED on the switches are always on as soon as ignition position is made.

Looking through the service manual the IGE (lighting, temperature via the climate control unit), BRIDGE CAN (high CAT temp - slow down) and the A/C control unit (rear screen and ambient temp) are responsible for most of this functionality. I removed the IGE unit and inspected and found a large amount of corrosion from water ingress. It looks old, nothing was found wet, and the oxidisation looks to have shorted between a number of the pins and components on the PCB. The PCB was cleaned up and the module refitted (I know, but I had to try) but the same issues remain. with the IGE removed the lights don't illuminate and the switches are no longer lit. so as a minimum the IGE needs to be replaced, and I am suspicious of the A/C module and perhaps the BRDGE CAN and even the main ECU.

I am not sure where the supply comes from for the starter motor but the relay currently works but the voltage is not there to switch.

Updates to follow...
 

Almichie

Junior Member
Messages
799
Looking at the wiring diagrams is seems the relay switched feed for the starter motor comes directly from one of the two 30A fuses in the power section (2 x 30A and 2 x 60A fuses with a cover over them in the passenger foot well). I'll double check the supply tomorrow.
 

redsonnylee

Member
Messages
1,550
Cheers, its also worth checking all the electrical cables, I recently had a problem and found some of the wrapping on a lot of the cables at the back of the engine had burnt away and through the insulation. This fixed the error oil CEL I had. The Maserati shed also found some more of the same which fixed a few more problems. It gets very hot in there.
 

RSM Masser

Member
Messages
2,437
If I use the isolator in the boot, when I switch it back on indicators flash, rear lights are on (not sure about side lights) I have lock/unlock start car and switch off, start again - all fine

Bu44ered if I know why - it's Italian!

Needs a starter motor now so I can't start it - might check those fuses though
 

Contigo

Sponsor
Messages
18,376
It seems to be 3200 gremlin season at the moment! I was amazed when I jumped in mine last week after 2 weeks on the drive (GTS was in the garage on trickle) and it started first time! No CEL's, no warning lights just lovely purring V8 goodness. I think we will keep it now...
 

Almichie

Junior Member
Messages
799
Further confusion tonight... The switched output to the starter motor works, at least the 12v from the relay is leaving the relay. I found the connections that come from the fuse box mounted cut off relay (not sure on the functionality of this as it sees a double 12v (fuse and starter switched output) onto the coil meaning it'll never operate unless one drops (starter?). Anyway, when I was fiddling with wires under the bonnet I pulled the starter feed and it came right off or wasn't on. I can't believe it want on but I guess you never know. Inlet needs to come off now to prive the starter functions at least.

No further forward other than adding the suspension error light to the stable, I suspect because i have been on and off with the ignition so much.

I'll get the starter wired back and see if it turns over tomorrow night.
 

RSM Masser

Member
Messages
2,437
Your suspension ERROR is one of the actuators at the top of the shock - it's a trial and error to find the one that is broken and you need an assistant to either turn on the ignition while you listen and feel each one.
I've got an error light and Cel - had them both for two years!
 

Contigo

Sponsor
Messages
18,376
They seize from time to time if the car has been sat. Fix the main issue first then worry about a sticking actuator later.
 

Almichie

Junior Member
Messages
799
I doubt it's anything to do with an actuator, it's something else causing the problem.

I've ordered an IGE as that definitely had damage, due tomorrow.
 

Spartacus

Member
Messages
3,186
What do you mean "at the moment" ? Only a 3200 owner would sound suprised that they started their car and had no warning lights ha ha
It seems to be 3200 gremlin season at the moment! I was amazed when I jumped in mine last week after 2 weeks on the drive (GTS was in the garage on trickle) and it started first time! No CEL's, no warning lights just lovely purring V8 goodness. I think we will keep it now...
 

davy83

Member
Messages
2,827
you have a bucket of problems there sir. you should anticipate that this is the result of many small individual faults, so i would make notes on every thing you try so you can remember what worked and what didnt. when i got my car it also had a miriad of faults with the the electrics and i started by getting a professional car electrical shop to go over the car and replace relays and fix any dodgy wiring, and i then worked through the electrical and sensor issues one at a time. it can take some patience to sort out a car with many gremlins. stay with it you will get there.
 

Almichie

Junior Member
Messages
799
So tonight brought some success: the car starts and runs. It must have been the cable connector as when I slid it onto the male spade it was loose. Remade and connected it was tested and turned the car over. Everything back together and it fired up, which is progress.

Remaining faults as it stands;

Doors don't lock on the key (new tonight!), but the indicators flash. Worked fine last night.
Error light on dash
Airbag light on dash
No tail lights other than brake lights
Front fog lights always on
Front fog light operated instead of side lights on parking light button
Rear de-mister always on

I suspect most of these are related to the IGE failure, I bought one today and this should be here by Saturday. Once this is in hopefully some of the other faults will go too.
I'm think the airbag light may need to be reset on an SD2/3 and the error light may just need a drive.

As soon as the IGE is here I'll get it in and report back.

Al
 

RSM Masser

Member
Messages
2,437
Fuse 16
Do a search on here, it's a easy if a bit tricky to actually carry out, linked to the accelerometer but will give you the no lights other than brake lights amongst others
 

Almichie

Junior Member
Messages
799
Fuse 16 is fine, one of the first things I checked. I have checked every fuse in the car that I can find now.

Hopefully I've not missed one!
 

RSM Masser

Member
Messages
2,437
That must be the next question on "Qustion of the day" thread
As it can't be decided what the firing order is on a V8 - how many fuses are there, might be a question too far!
Best of luck
 

Mott The Hoople

Junior Member
Messages
188
The ERROR dashlight for the actuator fault may just be the shock gear that fits into the actuator. Shock gears are very cheap to replace, actuators are not. Steve.
 

Almichie

Junior Member
Messages
799
Update: the IGE module fixed all but the airbag and error lights. I need to take it for a spin now (once it's all back together) to see if the Error lamp goes out by itself.

I fear the airbag lamp was me when fault finding with the steering column connectors - I unplugged them all with the ignition on...

So two random faults occurred at the same time but were entirely different, the starter motor cable was loose and the IGE module had failed due to previous water ingress! All I can say is I'm glad I had the wiring diagrams, and it takes something's like this to properly learn about the way your car works and where all the components live and act together. Maseratis certainly know how to bring you up and then crashing back down!
 

spkennyuk

Member
Messages
5,964
That must be the next question on "Qustion of the day" thread
As it can't be decided what the firing order is on a V8 - how many fuses are there, might be a question too far!
Best of luck

Please no ! Don't do that the v8 firing order question holds the record for the longest running question of the day which turned into a week :)