Windscreen wipers - where to start?

Windscreen wipers - where to start?

Author
Discussion

R___Mm

Original Poster:

3 posts

6 months

Saturday 28th December 2024
quotequote all
My 4.0 Chim (1998) decided that windscreen wipers are optional on the drive home the other evening in the rain… the fastest wipe setting still functions fine, but I get no wiper action when I select either of the two slower speeds.

Any suggestions where to start with fault finding?

miniman

27,439 posts

274 months

Saturday 28th December 2024
quotequote all
That would sound to me like the switch itself in the stalk.

Do the wipers park correctly when you switch them off?

Running at full speed but not at lower speed is a typical fault with blower fans where the resistor fails but I’m not sure if the wipers work in the same way.

ETA - this thread indicates there’s no resistor, so I’d be first checking the connector to the wiper motor under the bonnet and hosing it out with contact cleaner, then looking at the switch.

Edited by miniman on Saturday 28th December 13:27

Belle427

10,184 posts

245 months

Saturday 28th December 2024
quotequote all
Start by checking the wiring connectors at the motor for signs of corrosion.

Dr Mike Oxgreen

4,256 posts

177 months

Saturday 28th December 2024
quotequote all
First things first: which design of wiper system does yours have?

Many people, including quite knowledgeable folk, are completely unaware that Chimaeras after about 1998/9-ish have a completely different design which is not particularly vulnerable to water ingress because the wiper motor is inside the cabin (just above the driver’s knees) rather than in the left rear corner of the engine bay.

At least one response so far seems to have assumed that the wiper motor is in the engine bay, but this ain’t necessarily so. Your 1998 car is on the cusp of this design change, so it could either have the older design with the wiper motor in the rear corner of the engine bay, or the newer design with the motor inside the cabin.

The newer design can also be identified by the behaviour of the wipers, where the passenger side wipes a much smaller arc, and both wipers park much tighter down to the bottom of the screen.

Before we start speculating about corrosion and water damage, we need to identify which wiper arrangement you have.

Edited by Dr Mike Oxgreen on Saturday 28th December 15:51

5.0ltr

2,809 posts

211 months

Saturday 28th December 2024
quotequote all
The wiper relay coming loose in the Griff can create this.

R___Mm

Original Poster:

3 posts

6 months

Saturday 28th December 2024
quotequote all
The wiper motor is indeed in the engine bay

Dr Mike Oxgreen

4,256 posts

177 months

Saturday 28th December 2024
quotequote all
R___Mm said:
The wiper motor is indeed in the engine bay
Okay, now we can provide accurate advice. smile

So water ingress and corrosion on the motor connector is a possibility and worth looking at. Try plugging and unplugging, interspersed with generous sprays of contact cleaner.

R___Mm

Original Poster:

3 posts

6 months

Sunday 29th December 2024
quotequote all
I’ve tried the above to no avail. Disconnected/connected and plenty of contact cleaner, but the issue persists. There was a fair amount of moisture around the area of the connector/wiper motor.

When I use the fastest wipe setting (the only setting that still works), the blades don’t return to the “parked” position - issue with the park switch possibly?

miniman

27,439 posts

274 months

Belle427

10,184 posts

245 months

Sunday 29th December 2024
quotequote all
Some info on page 2 here for a similar issue.
https://www.pistonheads.com/gassing/topic.asp?h=0&...

grahambone

28 posts

294 months

Sunday 29th December 2024
quotequote all
I had a very similar issue, in that the wipers only worked on the fastest speed.

It turned out that the wire had broken off from the wiper speed dial the one on the steering column.