Front wipers - relaxed attitude

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archwayanimal

Active Member
Posts
191
Location
Oxfordshire
The front windscreen wipers on my TD5 sometimes take a few seconds to come on, either in intermittent, slow or fast mode. Once going, the motor is fine and park is fine too. Wash/wipe works fine. Would you suggest this is most likely a switch issue and I should replace that first?
 
The front windscreen wipers on my TD5 sometimes take a few seconds to come on, either in intermittent, slow or fast mode. Once going, the motor is fine and park is fine too. Wash/wipe works fine. Would you suggest this is most likely a switch issue and I should replace that first?

I would be tempted to check and clean all the connections on the motor assy's... and mechanical arms and linkage

I could be wrong but the wipers are controlled buy the BCU that is behind the glove box, the BCU (body control unit), is actually 2 relays, one for front and one for rear, however they are an integral part of the interior fusebox / I don't think they can be renewed separately, (great idea that is!!)...

I'm sure some one has a better idea than me and they'll be along soon ...
 
if it's making tricks on fast wipe too the problem is switch/wiring or contact/motor issue.

The BCU is involved only on intermittent mode, the management is like this:
1. Intermittent= switch-BCU-IDM(fusebox)-motor
2. Slow= switch-IDM-motor
3. Fast= switch-motor

RAVE said:
Front intermittent wipe variable delay
The front intermittent wipe variable delay operation allows the driver to adjust the interval between wipes to suit local
conditions. Front variable delay operation activates when the following conditions are met:
l Ignition switch in position I or II.
l Front wash/ wipe switch is in the intermittent position.
The BCU receives the front intermittent wipe signal from the front wash/ wipe switch. The BCU receives a separate
signal from the variable delay switch, determines the delay interval from the front wash/ wipe switch position and
passes it on to the IDM. The IDM energises the front wiper relay to activate the front wiper motor.
If the delay duration is decreased during front variable delay operation, the wipers immediately operate once and then
the delay cycle is reset to the new duration.
If the delay duration is increased during front variable delay operation, the delay cycle is automatically increased by
the BCU.
Front low speed
Front low-speed operation activates when the following conditions are met:
l Ignition switch is in position I or II.
l Front wipe/ wash switch is in low speed position.
Selecting low-speed on the front wash/ wipe switch signals the IDM to energises the front wiper relay, which provides
power to the front wiper motor assembly.
Front high speed
Front high-speed operation activates when the following conditions are met:
l Ignition switch is in position I or II.
l Front wipe/ wash switch is in high speed position.
Selecting high speed on the front wash/ wipe switch allows power to flow from the switch directly to the wiper motor.
The high-speed input goes to a set of brushes in the wiper motor that are closer together than the low speed brushes.
These brushes allow the motor to run at a faster speed but with less torque.
 
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