LR3/Disco 3
GENERAL
The wiper and washer system is controlled by the Central Junction Box (CJB) on receipt of requests made by the driver or
the rain/light sensor unit (if fitted). All wiper functions for the front and rear wipers are controlled from a multi-function
wash/wipe switch assembly located on the right hand side of the steering column.
The wiper and washer system comprises:
Front and rear wiper motors
A front wiper linkage
Two front and one rear wiper arms and blades
Two front washer jets and one rear washer jet
A washer reservoir and pump
A wash/wipe control column switch.
The following optional items can be added to enhance the wiper system:
A rain/light sensor for automatic wiper control
Heated front washer jets
Headlamp washers
Low fluid level sensor (fitted to vehicles with headlamp washers).
The wiper system can be optionally equipped with a rain/light sensor. The sensor, located below the interior rear view
mirror, detects rain drops on the windscreen and automatically operates the wipers in the intermittent mode. The column
stalk switch must be in the intermittent position for rain/light sensor controlled wiper operation.
The front wiper system has five stages of operation and six intermittent delay periods.
The five wiper stages are as follows:
Flick wipe
Off
Intermittent
Normal (slow) speed continuous
Fast speed continuous
Speed Control Intermittent Mode
The intermittent, slow and fast speeds are affected by road speed, providing the speed control intermittent wipe mode has
been configured. The intermittent wiper delay periods change with the road speed, with the delay decreasing as the road
speed increases.
Speed Dependant Wipe Mode
When the speed dependant wipe mode has been configured, the normal continuous operation changes to intermittent
operation when the vehicle is stationary. The fast speed operation changes to normal operation when the vehicle is
stationary.
The wiper and washers operate with the ignition switch in positions I or II. Wiper functions are suspended during engine
cranking to reduce battery power consumption under high load conditions.
Diagnostic information for the wiper system is available and can be retrieved using T4.
5
Rear wiper relay (located in the Central Junction Box (CJB))
6
Wiper relay 1 (located in the Battery Junction Box (BJB))
7
Wiper relay 2 (located in the BJB)
8
Front wiper linkage and motor assembly, including wiper arms and blades
9
Washer reservoir and pumps
10
Headlamp washer jets
