105 intermittent wiper wiring

[nick_the_fish]

Hi all,

The intermittent wiper has never worked on the Landcruiser (since we got it anyway), and now that the lo and high are starting to get a bit sluggish I thought I would replace the wiper motor. However Ayamama just quoted me £300 - £200 for the part and £100 delivery. So before I order it I want to check something else isn't the problem.

The wiper motor has a 5 pin plug, which I tested with a voltmeter at 'Off', 'INT', 'LO' & 'HIGH'

see table below

Pin 1 at both low and high the voltage starts at 10.5v ish and slowly decreases.
Pin 2 - Is this the earth? I can't see an earth wire, although not sure if it's earthing directly through the chassis?
Pin 3 - Always has a voltage
Pin 4 - ???
Pin 5 - seems to be only activated at 'HIGH' wiper speed.

Other than that I'm not sure what to make of any of the numbers. Any thoughts anyone?

Also - Does the wiper system have a relay somewhere that could be blown?? and/ or a dedicated INT relay??

Thanks all

N

 

[Grimbo]

11.4 volts is an odd number TBH.....below battery voltage so must be stabilised or through an ECU ? and again 10.66 v and 10.2 v are either as a result of a resistor or ECU....
Possible the INT is a variable timed relay....
Is the table above from the tech manual or what you were measuring ? If it's what you were seeing then maybe you have high resistance in the loom or a connector as I would expect to see battery voltage in the loom at something like a wiper motor..... which could explain your sluggish wiper motor .

 

[nick_the_fish]

Thanks @Grimbo Yep it was what I was measuring.

So..... if there is high resistance in the loom any thoughts on where I start looking?? I'll dig out the user manual and look for any relay locations, but is there anything else that could be faulty and replaceable??

 

[Grimbo]

First place to look is any multi plug or connector in the loom.... where they are on a 105 I have no idea... but if damp has gotten in to a loom the multi plugs are normally where it starts...
The wiper switch on the column could be a good place to start with the multi meter..... it will or should have a battery voltage supply .... if you can probe the back of the connector you can then see the outputs at various settings .... they should all also I would think be at the same voltage as the input... from there I reckon they will travel to the motor ....
Could it be that like the blower motor for the heater fan slow speed on the wipers is through a resistor and fast is just giving the motor battery voltage ? No idea where the resistor would be though and /or if it might be in the wiper motor .
I doubt the wiring for the wipers is any different from a 100 series.... can you get diagrams from someone with a FSM ?

 

[nick_the_fish]

Awesome, thanks @Grimbo

That sound like a plan. I'll get on it in the next few days and report back. I managed to get a digital copy of the FSM for the 105 ages ago, so I'll have a look in there