Technical Wiper Wiring

[Steady1234]

Hi all , 2014 Ducato 3ltr ,
This vehicle had a small fire under the bonnet, I’m repairing it but have an issue, some of the bulkhead wiring was slightly burnt been repaired but I have no wipers I’ve tested and there’s power and earth , but nothing happening, washers work , I’ve another ducato and it has the same power in the same places , bit baffled, if I’m correct the relay is part of the ecu ??
Any help appreciated, cheers

 

[Kahcorp]

Wiper motor plug testing
Wiper Motor plug Pin 1 Neg Black
Wiper Motor plug Pin 2 12v. Blue/black

White/black Motor plug Pin 3 - to Body computer Pin 29 speed 2 negative command
White/blue. Motor plug Pin 4 - to Body computer Pin 40 speed 1 negative command
White/green Motor plug Pin 5 - to Body computer Pin 19 Cam negative

 

[Steady1234]

Wiper motor plug testing
Wiper Motor plug Pin 1 Neg Black
Wiper Motor plug Pin 2 12v. Blue/black

White/black Motor plug Pin 3 - to Body computer Pin 29 speed 2 negative command
White/blue. Motor plug Pin 4 - to Body computer Pin 40 speed 1 negative command
White/green Motor plug Pin 5 - to Body computer Pin 19 Cam negative

I’m not good with electrics , but the thick black earth was melted most of the way along the bulkhead even though the fire was only small and by the wiper motor, could this mean it’s fried the relay in the bcm ?

 

[deejays]

I’m not good with electrics , but the thick black earth was melted most of the way along the bulkhead even though the fire was only small and by the wiper motor, could this mean it’s fried the relay in the bcm ?

....or did the wiper motor burn out and cause the fire in the first place> What caused the fire?

 

[Kahcorp]

No. As the wire is a negative wire & the Chassis is negative there is no short.
The thicker wire to pin 2 is the only 12v wire which is one end of the plug.
The plug has numbers on it if you look carefully
It is numbered 1, 5, 4, 3, 2
Do you have a multimeter?
Check voltage across pin 1 & 2
There are ways to check operation of the wiper motor by using test leads but safer to do with connector unplugged.
DO NOT put any 12v supply to the plug going back to the body module or for that fact any other wiring or module you are checking.

 

[Steady1234]

No. As the wire is a negative wire & the Chassis is negative there is no short.
The thicker wire to pin 2 is the only 12v wire which is one end of the plug.
The plug has numbers on it if you look carefully
It is numbered 1, 5, 4, 3, 2
Do you have a multimeter?
Check voltage across pin 1 & 2
There are ways to check operation of the wiper motor by using test leads but safer to do with connector unplugged.
DO NOT put any 12v supply to the plug going back to the body module or for that fact any other wiring or module you are checking.

Thank you

 

[deejays]

Thank you

@Steady1234 Do you know what caused the fire?

 

[deejays]

Hi all , 2014 Ducato 3ltr ,
This vehicle had a small fire under the bonnet, I’m repairing it but have an issue, some of the bulkhead wiring was slightly burnt been repaired but I have no wipers I’ve tested and there’s power and earth , but nothing happening, washers work , I’ve another ducato and it has the same power in the same places , bit baffled, if I’m correct the relay is part of the ecu ??
Any help appreciated, cheers

@Steady1234 Before the fire - did you by chance connect another vehicle or battery to jump start either your vehicle or another vehicle?

 

[Steady1234]

@Steady1234 Before the fire - did you by chance connect another vehicle or battery to jump start either your vehicle or another vehicle?

Tha battery was still connected ,

 

[Steady1234]

Tha battery was still connected ,

Sorry, I wouldn’t know I bought it after the fire

 

[deejays]

Sorry, I wouldn’t know I bought it after the fire

OK. The reason I asked is that there have been reported issues when jump starting that, depending where the (in particular) negative cable is connected, can cause the wiper motor to burn out - and I suspect it may be caused by large surge currents through the relatively small earth cabling.

 

[Communicator]

No. As the wire is a negative wire & the Chassis is negative there is no short.
The thicker wire to pin 2 is the only 12v wire which is one end of the plug.
The plug has numbers on it if you look carefully
It is numbered 1, 5, 4, 3, 2
Do you have a multimeter?
Check voltage across pin 1 & 2
There are ways to check operation of the wiper motor by using test leads but safer to do with connector unplugged.
DO NOT put any 12v supply to the plug going back to the body module or for that fact any other wiring or module you are checking.

No! The plug will be numbered 1,2,3,4,5. It is just the schematic that shows the pins in a non numeric order for simplicity.
I have two copies on the x250 wiper wiring, saved from previous threads. Credits to @Anthony489 for the annoted version, and either @rayc, or an other for the packet print.

Inspecting either diagram will reveal that the motor control wires for, speed 1, speed 2, and park connect directly to the BCM (M001).

 

[Steady1234]

No! The plug will be numbered 1,2,3,4,5. It is just the schematic that shows the pins in a non numeric order for simplicity.
I have two copies on the x250 wiper wiring, saved from previous threads. Credits to @Anthony489 for the annoted version, and either @rayc, or an other for the packet print.

Inspecting either diagram will reveal that the motor control wires for, speed 1, speed 2, and park connect directly to the BCM (M001).

Thanks for that , could it be the wiper stalk that’s shorted out ?

 

[Steady1234]

No. As the wire is a negative wire & the Chassis is negative there is no short.
The thicker wire to pin 2 is the only 12v wire which is one end of the plug.
The plug has numbers on it if you look carefully
It is numbered 1, 5, 4, 3, 2
Do you have a multimeter?
Check voltage across pin 1 & 2
There are ways to check operation of the wiper motor by using test leads but safer to do with connector unplugged.
DO NOT put any 12v supply to the plug going back to the body module or for that fact any other wiring or module you are checking.

One has 12 volt ,and another has 8 volts going to it ?

 

[Communicator]

One has 12 volt ,and another has 8 volts going to it ?

To quote two readings at unspecified pins conveys little, except perhaps to suggest the possibility of a BCM fault. If you read the pdf that I posted, it identifies BCM pin allocations for the first an second speeds. Perhaps reasonable to assume that the third control wire is the park control.
What voltages do you see with identical test on working installation?