Wipers/Washers System Description - Failsafe Function
Hardware Failsafe
The control module of the CPU for the windshield wiper control unit/motor in case of an abnormality is as shown in the table.

Output Name
Fixed Value
Motor Drive Circuit
All OFF
LIN Communication Circuit
OFF
Body Control Module Frame Error
In case of a bus off error or wiper/washer switch signal error, the failsafe operation is as follows:

NOTE: If the back up line switches from OFF to ON, failsafe operation starts with Step 1.

 
Back Up Line
Failsafe Operation When Wiper is Active
Failsafe operation When Wiper is Not Active
1
OFF
Parking operation
(Except for wiping in AUTO mode)
No operation (Remains stopped)
2
ON
Step 1
HIGH operation for 3 minutes ? Step 2
Step 2
LOW operation for 3 minutes ? Step 3
Step 3
Intermittent operation (speed-dependent variable mode) for 12 minutes ? Step 4
Step 4
Parking operation
Body Control Module Frame Error in Auto Mode Operation
If a wiper switch signal error occurs while the wipers are operating in auto mode, the failsafe operation is as follows:

 
Previous Operation in AUTO Mode
Failsafe Operation
1
HIGH
Step 1
HIGH operation for 3 minutes ? Step 2
2
LOW
Step 2
LOW operation for 3 minutes ? Step 3
3
INT, Lower reversal position, or Parking position
Step 3
Intermittent operation (speed-dependent variable mode) for 12 minutes ? Step 4
Step 4
Parking operation
BACK UP LINE and LIN Inconsistency Error
If an error occurs due to inconsistency between the back up line and LIN (IG1 signal and wiper switch signal), the failsafe operation is as follows:

Back Up Line
IG1
Wiper Switch Position
Failsafe Operation
ON
ON
LOW and HIGH Switch OFF
HIGH
OFF
??
Step 1
HIGH for 3 minutes ? Step 2
Step 2
LOW for 3 minutes ? Step 3
Step 3
Intermittent operation (speed-dependent variable mode) for 12 minutes ? Step 4
Step 4
Parking operation
Automatic Wiper Frame Error
If the automatic lighting/rain sensor is faulty or an abnormal automatic wiper signal is detected, the failsafe operation is as follows:

 
Previous Operation in AUTO Mode
Failsafe Operation
1
HIGH
Step 1
HIGH for 3 minutes ? Step 2
2
LOW
Step 2
LOW for 3 minutes ? Step 3
3
INT
Step 3
Intermittent operation (speed-dependent variable mode)
4
Lower reversal position or Parking position
Thermal Protection Function
The intelligent controlled wiper system performs thermal protection control to prevent excess heat generation by the windshield wiper control unit/motor due to abnormal load. If the temperature of the windshield wiper control unit/motor exceeds the protective action temperature, the wiping speed is reduced, and is restored once the temperature falls below the reset action temperature.