CABIN
STW34, STW37, STW40, WSM
10-S4
WINDSHIELD WIPER
9Y1211109CAS0001US0
Temperature Cannot
be Controlled (Mode
Motor and / or Mode
Switch Malfunction)
1. Mode motor is damaged Replace mode motor assembly. 10-S28
2. Mode switch is damaged Replace mode switch assembly. 10-S24
3. Wiring harness controller
is disconnected
Repair or replace wiring harness. –
Temperature Cannot
be Controlled
(Heater Hoses Laid is
Bad)
1. Heater hose is caught Repair heater hose. 10-S51
2. Heater hose is twisted or
bent
Repair or replace heater hose. 10-S51
Symptom
Probable Cause and
Checking Procedure
Solution
Reference
Page
Windshield Wiper
Does Not Operate
1. Fuse is blown
(Short-circuit, burnt
component inside motor or
other part for operation)
Correct cause and replace fuse. G-39
2. Wiper motor is damaged
(Broken armature, worn
motor brush or seized
motor shaft)
Replace wiper motor. 10-S31
3. Wiper switch is damaged Replace wiper switch. 10-S30
4. Foreign material interrupts
movement of link
mechanism
Repair linkage. –
5. Wiper arm is seized or
rusted
Lubricate or replace wiper arm. –
Windshield Wiper
Operating Speed Is
Too Low
1. Wiper motor is damaged
(Short-circuit of motor
armature, worn motor
brush or seized motor
shaft)
Replace wiper motor. 10-S31
2. Low battery voltage Recharge or replace battery. G-29
3. Humming occurs on motor
in arm operating cycle due
to be seized arm shaft
Lubricate or replace wiper motor. 10-S54
4. Wiper switch contact
improper
Replace wiper switch. 10-S30
Windshield Wiper
Does Not Stop
Correctly
1. Wiper motor is damaged
(Contaminated auto-return
contacts or improper
contact due to foreign
matter)
Replace wiper motor. 10-S54
Symptom
Probable Cause and
Checking Procedure
Solution
Reference
Page
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