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Discussion Starter · #1 ·
:eek: Hi. I have a problem whit my window wipers. I have a 1999 110 defender 300Tdi. When I bougt it I cound't turn my wipers off, I had to pull the fuse out.
I whent out buying a new switch, but this didnt fix the problem. Then i tested my old switch on my friend defender and it worked ok. So, then I looked at my reele'. When I have taken the reele' out I now can turn the washers off but they dont't work at interval. The rest is oki. I olso testet the reele' on my friends defender, and it worked ok.
I've been told that it could be the switch on the wiper engine :eek:
Before you say it, the new switch didn't work. A factory fault.
Do anyone have a idea? Were to look etc :dunno:
 

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Electrical Circuit

Hi Cannot help with the actual problem but can provide you with the landrover documentation on the wiper circuits.

WIRE COLOUR CODES
General
The following list contains wire colour codes used on the vehicle harness's.
Code Colour
B Black, G Green, K Pink, LG Light green, N Brown, O Orange, P Purple
R Red, S Slate (Grey), U Blue, W White, Y Yellow

WIPERS AND WASHERS
Description
General
The front wipers are controlled via the wash/wipe switch mounted on the steering column.
The front wipers have two speed settings, a flick wipe facility, and an intermittent wipe
function, which is controlled by a wiper delay ECU. The wiper delay ECU also controls the
programmed wash wipe function, which is activated by pressing the end of the wash/wipe
switch.
The rear screen wiper is controlled via a latching switch mounted on the fascia centre
module. The rear screen wash facility is controlled via a separate non-latching switch, which
is also located on the fascia centre module.
Operation
Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fusible link 5 of the under seat
fuse box (C0632) on an N wire. Fusible link 5 (C0570) is connected to the ignition switch
(C1043 on LHD, C0028 on RHD) by an NW wire. When the ignition switch is turned to the
'ignition' position, current flows across the switch (C1732 on LHD, C0094 on RHD) to fuse 9
and fuse 10 of the passenger compartment fuse box (C0580) on a W wire.
Fuse 9 (C0580) supplies power to the front wash wipe circuit on a WG wire. Fuse 10 (C0580)
supplies power to the rear wash wipe circuit on a WG wire.
Front Wipers
Fuse 9 of the passenger compartment fuse box (C0580) provides an ignition feed to the
following on WG wires:
 The wash/wipe switch (C1740 on LHD, C0278 on RHD)
 The wiper delay ECU (C0303)
 The wiper motor park switch (C1593 on LHD, C0030 on RHD).
Slow Wipe
When the wash/wipe switch is moved to the slow wipe position, current flows from the switch
(C1740 on LHD, C0278 on RHD) to the wiper motor (C1593 on LHD, C0030 on RHD) on a
ULG wire. Current flows across the motor (C1593 on LHD, C0030 on RHD) to earth on a B
wire. As current has to flow through the in-line resistor located within the wiper motor, the
wiper motor operates at slow speed.
DESCRIPTION AND OPERATION
DEFENDER 02MY 4.35
Fast Wipe
When the wash/wipe switch is moved to the fast wipe position, current flows across the
switch (C1740 on LHD, C0278 on RHD) to the wiper motor (C1593 on LHD, C0030 on RHD)
on a RLG wire. Current flows across the motor (C1593 on LHD, C0030 on RHD) to earth on
a B wire. Current by-passes the in-line resistor located within the wiper motor, enabling the
motor to operate at fast speed.
Intermittent Wipe
When the wash/wipe switch is moved to the intermittent wipe position, current flows across
the switch (C1740 on LHD, C0278 on RHD) to the wiper delay ECU (C0303) on a WG wire.
The wiper delay ECU (C0303) returns a pulsed voltage signal back to the wash wipe switch
(C1740 on LHD, C0278 on RHD) on a YLG wire. The pulsed voltage signal flows through
the wash wipe switch (C1740 on LHD, C0278 on RHD) to the wiper motor (C1593 on LHD,
C0030 on RHD) on a ULG wire. The wiper motor operates at slow speed during the
intermittent wipe function.
Flick Wipe
When the wash/wipe switch is moved upwards against (but not past) spring pressure, the
wipers will operate until the switch is released. Current flows across the wash/wipe switch
(C1740 on LHD, C0278 on RHD) to the wiper motor (C1593 on LHD, C0030 on RHD) on an
RLG wire, powering the motor at fast speed until the wash/wipe switch is released.
Park Circuit
The park circuit allows the wipers to return to their park position when the wash/wipe switch
has been moved back to the off position. The park switch is integral with the wiper motor
(C1593 on LHD, C0030 on RHD), and receives an ignition feed from fuse 9 of the passenger
compartment fuse box (C0580) on a WG wire.
The park switch is open circuit when the wipers are in any position other than their park
position. When the wipers reach their park position, the switch contacts close, enabling the
ignition feed from fuse 9 of the passenger compartment fuse box to flow to the wiper delay
ECU (C0303) on an NLG wire. The wiper delay ECU (C0303) then provides a feed to the
wash/wipe switch (C1740 on LHD, C0278 on RHD) on a YLG wire. The wipers continue to
operate at slow speed (as described in the Slow Wipe section previously) until they reach
their park position. The park switch then returns to its open position, cutting the feed to the
wiper delay ECU.
DESCRIPTION AND OPERATION
4.36 DEFENDER 02MY
Programmed Wash Wipe
Pressing the end of the wash/wipe switch initiates the programmed wash/wipe function.
When the switch is pressed, current flows across the switch (C1740 on LHD, C0278 on
RHD) to the windscreen washer pump (C0008) on an LGB wire. The pump (C0008) is
earthed on a B wire.
When the switch is pressed, the wash/wipe switch (C1740 on LHD, C0278 on RHD) also
provides a feed to the wiper delay ECU (C0303) on an LGB wire. The wiper delay ECU
(C0303) will now provide a feed to the wash/wipe switch (C1740 on LHD, C0278 on RHD)
on a YLG wire, which operates the wipers at slow speed (as described in the Slow Wipe
section previously). When the washer switch is released, the wiper delay ECU will operate
the wipers for a further three cycles.
Rear Wiper
Fuse 10 of the passenger compartment fuse box (C0580) provides a feed to the following
on WG wires:
 The rear screen wiper motor park switch (C1105)
 The rear screen wiper relay (C0124)
 The rear washer switch (C0073).
The earth path for the rear screen wiper relay coil (C0124) is controlled by the rear screen
wiper switch (C0079) on a BG wire. When the switch is pressed, current flows across the
closed switch contacts to earth on a B wire. The energised rear screen wiper relay (C0124)
provides a feed to the wiper motor (C0388) on an RLG wire. Current flows through the wiper
motor (C0388) to earth on a B wire.
Park Circuit
The park circuit allows the rear screen wiper to return to its park position when the wiper
switch has been switched off. The park switch is integral with the wiper motor (C1105), and
receives an ignition feed from fuse 10 of the passenger compartment fuse box (C0580) on
a WG wire.
The park switch is open circuit when the wiper is in any position other than its park position.
When the wiper reaches its park position, the switch contacts close, enabling the ignition
feed from fuse 10 of the passenger compartment fuse box to flow to the wiper relay (C0124)
on an NLG wire. The de-energised relay (C0124) provides a feed to the wiper motor (C0388)
on an RLG wire. The wiper continues to operate until it reaches its park position. The park
switch then returns to its open position, cutting the feed to the wiper relay.
 
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