1987 SUZUKI GRAND VITARA oil change

21-4. WINDSHIELD WIPER MOTOR
CIRCUIT DESCRIPTION
The circuit is designed so that, when the Wiper Switch is turned “OFF”,the blade will automatically return
to the horizontal position. In Fig. 21-11, when the Wiper Switch is turned “ON” while the Main Switch is
“ON”, current is supplied to the Wiper Motor from the Battery, the motor rotates and the blade moves.
The gear mechanism which converts rotational movement of the motor into swinging movement of the
blade has a cam on the final gear shaft. The cam switches the contacts of P0 and P2 every revolution.
(At the blade stop position, the contact is switched from P2 to P1.)
Repeated contact making and breaking is independent of the wiper motor rotation. When the Wiper Switch
is turned “OFF” while the blade is in a position other than the rest position, motor current path is changed
(i.e. BI/W + BI + MOTOR). Therefore, the motor keeps rotating even though the wiper switch is turned
“OFF”, and the blade will return to the rest position.
When the blade returns to the rest position, the cam contact is changed from P2 to P1 and motor current
is shunted. When supply to the motor is cut off, a counter electromotive force is generated in the
armature. As a result of this counter electromotive force, current flows through the motor and shunt
circuit and the motor stops and the wiper blade stays in the specified position.
[INTERVAL WIPER RELAY CIRCUIT (OPTIONAL)]
When the wiper switch is set to the interval position with the ignition switch ON (the condenser is charged
at this time), current from the battery flows through the yellow/blue wire, generates magnetic force in the
coil in the relay and causes the switch in the relay to turn ON. Then current is transmitted in the sequence
of yellow/blue, relay, wiper switch and blue and causes the wiper motor to rotate (meanwhile, the conden-
ser discharges). By the time the wiper motor makes one rotation and the cam in the motor comes to the
automatic stop position P1, the condenser in the relay has finished discharging (no magnetic force in the
coil in the relay). Then the switch in the relay turns OFF and the wiper stops. They remain that way until
the condenser is fully charged. As soon as the condenser begins discharging after being fully charged,
magnetic force generated in the coil in the relay causes the switch to turn ON. As described above, interval
operation of the wiper motor is controlled by charging and discharging of the condenser.
2-speed type
OFF
1. Battery2. Main switch
3. Fuse box4. Wiper motor5. Wiper switch
6. Washer switch7. Washer motor
W/Y : White/Yellow
B/BI : Black/Blue
Y/El: Yellow/Blue
BI/W: Blue/WhiteBI: Blue
LOW SPEED
BIIR : Blue/Red
HIGH SPEED
Fig. 21-11
6
21-9

3) Automatic stop action test
Connect yellow terminal of motor to positive
@ battery terminal, and put a jumper
between Blue/White (Blue/Black) and Blue
terminals to see if motor output shaft comes
to a halt at a certain, not just any, angular
position. That position corresponds to start-
ing position of the blade. Using jumper,
stop motor a number of times to make sure
that motor stops at the same position each
time.
Fig. 21-14 Testing motor
1. Positive terminal
2. Negative terminal
3. Put a jumper between
Blue/White (Blue/Black) and Blue
4) Internal wiper relay test
1. Disconnect wiper & washer switch coupler.
2. Turn wiper switch to “I NT” position.
3. Connect positive battery terminal to
Yellow/White coupler terminal and nega-
tive battery terminal to Black terminal.
If an operating sound is heard, the relay is
at work properly.
Switch connector
14.Yellow/White
15.Blue16.Blue/Red17.Blue/Black
18.Black19.Blue/White
21-5. WATER TEMPERATURE METER
AND GAUGE
The water temperature meter is located in the
combination meter and its gauge unit on the
inlet manifold.
The gauge unit shows different resistance values
depending on the coolant temperature. This
causes a current f lowing through the temperature
meter coil to change, controlling the meter
pointer. That is, when the coolant temperature
is raised, the gauge unit resistance is decreased
with more current flowing through the meter
coil, raising the meter pointer upward from the
“C” position.
INSPECTION
[Water temperature meter]
1.
2.
3.
Disconnect Y/W (Yellow/White) lead wire
going to gauge unit installed to intake mani-
fold.
Use a bulb (12V 3.4W) in position to ground
above wires as illustrated.
Turn main switch ON, Confirm that the bulb
is lighted and meter pointer fluctuates several
seconds thereafter.
If meter is faulty, replace it.
1. Battery2. Water temperature meter
3. Test lamp (12V. 3.4W)YIW: Yellow/WhiteFig. 21-16
Fig. 21-1521-11

[Gauge unit] 21-6. FUEL LEVEL METER AND GAUGE
Warm up gauge unit. Thus make sure its resis-
tance is decreased with increase of temperature.
Temperature and resistance relationship can be
plotted in a graph as shown below.
The fuel level meter circuit consists of the fuel
level meter installed inside the combination
meter and the fuel level gauge installed to the
fuel tank.
Fig. 21-17
wTemp.
Fig. 21-18 Resistance- Temp. Relationship
Temperature
50°C (122°F)
80°C (176°F)
100°C (212°F)
Resistance
133.9 -178.9 f-i
47.5-56.8 !a
26.2 -29.3 52
Current flowing through the meter coil is
changed to control the meter pointer. That is,
when fuel is full, the fuel level gauge unit
resistance is decreased with more current flowing
into the meter coil, causing the meter pointer
to point at the “F” position.
INSPECTION
[Fuel level meter]
1. Disconnect Y/R (Yellow/Red) lead wire
going to gauge unit.
2. Use a bulb (12V 3.4W) in position to ground
above lead wire as illustrated.
3. Turn ignition switch ON.
Make sure the bulb is lighted and meter
pointer fluctuates several seconds thereafter.
If meter is faulty, replace it.
Fig. 21-191. Battery2. Fuel level meter
3. Test lamp (12V. 3.4%‘)YR : Yellow/Red
NOTE:
Wind sealing tape on screw threads of gauge
before installing gauge to intake manifold.
21-12