Rain Sensor Unit Inspection; Checking Sensitivity Selection (Checking Variable Resistance Knob Position); Wiper Blade; Coupler - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

9D-34
9. Instant wipe
When wiper system is operated by wiper switch, it wipes windshield once before returning to operation position.
This one-time operation happens every time when wiper switch is operated to increase the sensitivity by changing
INT volume from lower state (state 1) to higher stage. However, it does not happen when wiper switch is changed
into lower sensitivity. If ignition switch is turned ON when ignition switch is turned off and wiper switch is set to a
certain sensitivity, wiper operates once immediately to notice the driver wiper system operation. If rain is too small
to operate the wiper system with AUTO mode, rain sensor remains in AUTO INT mode for long time.

Rain Sensor Unit Inspection

Checking sensitivity selection (checking variable resistance knob position)

Check that variable resistance knob on multi-function switch is in middle position (between S and F).
When knob is located on F (Fast) or S (Slow), the sensitivity is too high or low so can cause customer's complaint if he/
she does not know correct usage.
Self-diagnosis
1. Rain sensor has below 2 self-diagnosis test modes.
1) Fault A self-diagnosis
If rain sensor servo operation point exceeds the value determined by software, the sensor is in Fault A. It
happens when the portion of the windshield with coupler is damaged or sensor is removed from coupler.
2) Fault B self-diagnosis
If rain sensor does not respond to rain signal, it means Fault B. It happens when the portion of the windshield
with coupler is damaged or sensor is defective.
2. Adhesion value
When Fault A is detected, adhesion value will be determined. Adhesion value is 140. In this case, windshield
operates under every condition if not damaged severely.
3. Malfunctions when INT volume sensitivity has adjusted
Self-diagnosing methods based on sensitivity adjustment and wiper movement are as below.
1) Set INT volume sensitivity to stage 5 (fast) under ignition ON and wiper switch AUTO position.
2) Change sensitivity from stage 5 to 4 under above conditions.
3) If wiper operates once, it is Fault A self-diagnosis. Check that windshield has damaged or sensor is installed
on the coupler completely from service shop.
4) After checking above 3), change sensitivity from stage 4 to 3 (medium).
5) If wiper operates once, it is Fault B self-diagnosis and replace rain sensor with new.

Wiper blade

Check wiper blade for wear. If worn excessively and cannot clean sensor portion, the sensor cannot detect rain volume
correctly.

Coupler

Check coupler surface on the windshield for excessive bubbles. If there are bubbles inside of sensor, cannot sense
correctly. Also check coupler for correct position. Check that sensor portion of the coupler is locating inside of opening
space on ceramic coating section on the windshield. If sensing portion is covered by ceramic coating, infrared rays from
sensor cannot transmitted so cannot sense correctly.
Windshield
Check outer surface of windshield on sensing space for excessive wear, scratch or damage. To a certain degree, the
sensor compensate for that wear but if excessive, cannot sense correctly. To check it, use self-diagnosis function.
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
SWITCHES
REXTON SM - 2004.4