wsm STW37 Workshop Manual page 442

STW34, STW37, STW40, WSM
HORN
Symptom
Horn Does Not Sound 1. Combination switch is
EASY CHECKER™
Symptom
Engine Oil Pressure
Lamp Lights Up
When Engine is
Running
Engine Oil Pressure
Lamp Does Not Light
When Main Switch is
Turned ON and
Engine is Not
Running
Probable Cause and
Checking Procedure
damaged.
2. Horn is damaged.
3. Head light relay is
damaged.
4. Wiring harness
disconnected or
improperly connected
(between combination
switch and horn)
Probable Cause and
Checking Procedure
1. Engine oil pressure is too
low.
2. Engine oil is insufficient.
3. Engine oil pressure switch
is damaged.
4. Wiring harness between
engine oil pressure switch
lead and chassis is
short-circuited.
5. Electrical circuit in
instrument panel board is
damaged.
1. Bulb is blown.
2. Engine oil pressure switch
is damaged.
3. Wiring harness is
disconnected or
improperly connected
(between instrument panel
and engine oil pressure
switch).
Solution
Replace combination switch.
Replace horn.
Replace head light relay.
Repair or replace wiring harness
between combination switch and horn.
Solution
Repair engine oil pressure.
Fill engine oil.
Replace engine oil pressure switch.
Repair wiring harness between engine oil
pressure switch lead and chassis.
Replace instrument panel.
Replace instrument panel.
Replace engine oil pressure switch.
Repair or replace wiring harness
between instrument panel and engine oil
pressure switch.
9-S5
ELECTRICAL SYSTEM
Reference
Page
9-S33
–
9-S27
–
Reference
Page
–
G-8
9-S40
–
3-S17,
3-S32
3-S17,
3-S32
9-S40
–
KiSC issued 11, 2014 A