Rear window wiper

[lammie200]

My first gremlin popped up. The rear wiper won't shut off. I removed the connection at the motor and ordered a delete kit. Just wondering if anyone knows where the relay for the motor is?

[ElectricLLL]

Interesting. I have a similar gremlin with the rear window wiper, too. It went on full-speed when the car is put in reverse. I had a call into Fiat Care already and the rep I am working with (for the rear window breakage problem) thought it was really weird.

What is a "delete kit"?

[lammie200]

https://shopeurocompulsion.net/collections/abarth-exterior/products/cravenspeed-rear-wiper-delete-kit

Sounds like yours did something similar to mine. The windshield wipers were turned off, but when I shifted to reverse they started and wouldn’t shut off no matter what I did. I believe that the problem is the switch that is in the motor itself, but I was happy to remove the motor, trim out the hole and plug the fluid line.

[Fiat500USA]

Sorry to hear. Here's the relay panel. Don't see a wiper relay. I don't have the manual handy at the moment, but will take a look when I can.

The starter relay on a Fiat 500 is the T20 Relay.





Relay Alternate Description Amperage
T02 R0881 Headlamp 20A
T03 R0826 Horn 20A
T05 R0819 A/C Clutch 20A
T06 R0813 Radiator Fan - Low 30A
T07 R0812 Radiator Fan - High 40A
T08 R0876 HVAC - Blower 40A
T09 R907 Engine Control System (Main Relay) 30A
T10 R0030 Cigar Lighter / Spare 20A
T14 R0827 Fog Lamp 20A
T17 R0823 Fuel Pump 15A
T19 R906 Cold Start 30A
T19 RL501 Rear - Fog Lamp 30A
T20 R0879 Starter 30A
T30 R0833A After Run Pump 20A
T30 R0834A MTA Pump 30A
T31 R0028 Rear Window Defogger 30A

MAXI FUSES

Fuse Alternate Description Amperage
F01 F0001 Body Controller 60A
F02 F0002 Audio Amplifier 20A
F03 F0003 Ignition Switch 20A
F04 F0004 Anti-Lock Brake Pump 40A
F05 F0005 Electric Power Steering 70A
F06 F0006 Radiator Fan - Single Speed 20A
F06 F0006 Radiator Fan - Low Speed 30A
F07 F0007 Radiator Fan - High Speed 40A
F08 F0008 Blower Motor 40A

MINI FUSES

F09 F0009 Powertrain 10A
F10 F0010 Horn 10A
F11 F0011 Powertrain 15A
F11 F0011 Powertrain (Multiair – If Equipped) 10A
F14 F0014 High Beam (Shutter) 5A
F15 F0015 Cigar Lighter 15A
F16 F0016 Transmission 7.5A
F17 F0017 Powertrain 25A
F17 F0017 Powertrain (Multiair – If Equipped) 15A
F18 F0018 Powertrain 15A
F18 F0018 Powertrain (Multiair – If Equipped) 5A
F19 F0019 Air Conditioning 7.5A
F20 F0020 Heated Seats – If Equipped 15A
F21 F0021 Fuel Pump 15A
F22 F0022 Powertrain 20A
F23 F0023 Anti-Lock Brake Valves 20A
F24 F0024 Stability Control System 7.5A
F30 F0030 Fog Lamps 15A
F82 F0082 Sunroof/Convertible Top 30A
F83 F0083 Cooling Pump – If Equipped 20A
F84 F0084 Transmission 10A
F85 F0085 Rear Defroster 15A
F87 F0087 Rear Defroster 5A

Fiat 500 Starter Circuit Wiring Diagram

[ATTACH]32972[/ATTACH]

[map]

First, this isn't a 2012 model, is it?

The BCM has a chip that controls the wipers, but that chip will usually snuff if it fails (no wipers, front or rear). I wonder if one of the BCM relays near that chip is used to boost the signal? https://www.ryangralinski.com/fiat-5...cal-nightmare/

[Fiat500USA]

Fiat 500 and 500 Abarth Wiper System

Some info on the Fiat 500 and 500 Abarth Wiper System, courtesy of the repair manual:

Front and Rear Wiper Control - The BCM monitors inputs from the front and rear wiper switch to
provide control of the either the front or rear wiper motors. The BCM also controls the intermittent wiper
feature of the front wiper system.

The right multi-function switch provides hard wired analog and resistor multiplexed inputs to the Body Control
Module (BCM) for all of the wiper and washer system functions. The BCM then provides the appropriate hard
wired control outputs to energize or de-energize the wiper and washer relays soldered onto its printed circuit
board. The relays control the flow of battery current to the wiper motors and washer pump motor, invoking
the requested wiper and washer system operating modes. Front and rear wiper and washer system operation is
completely controlled by the BCM logic circuits, and that logic will only allow these systems to operate when
the status of the ignition switch is Accessory or On.


The hard wired circuits and components of the wiper and washer system may be diagnosed using
conventional diagnostic tools and procedures. Refer to the appropriate wiring information. However,
conventional diagnostic methods will not prove conclusive in the diagnosis of the wiper and washer
system or the electronic controls and communication between other modules and devices that provide some
features of the front wiper and washer system. The most reliable, efficient and accurate means to diagnose the
front wiper and washer system or the electronic controls and communication related to front wiper and washer
system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.



Source: FCA

[lammie200]

Someone posted the below on another board. I believe that it is from a manual. It makes me think that the most probably cause is the switch in the motor that doesn’t recognize the parked position of the wiper arm. It never senses that the arm reaches the stopped position so it just keeps going since it is getting power from the ignition switch. I doubt that it is a melted chip on the BCM. If it was I would bet that this wouldn’t be the only problem present. My 2 cents.


The rear wiper motor park switch is a single pole, single throw, momentary switch within the wiper motor that
is mechanically actuated by the wiper motor transmission components. The park switch alternately closes and
opens a voltage signal for the rear wiper motor electronic control logic circuitry of the BCM. The park switch is
normally an open circuit when the rear wiper blade is in the parked position, and is connected to fused ignition
output when the rear wiper blade is anywhere except parked.