1991 MITSUBISHI 3000GT wipers

EXTERIOR - Troubleshooting51-7
LOPERATION

l When the wiper switch is placed in the LO
position with the ignition switch in the ACC or
ON position, wipers operate continuously at low
speed.
l Placing the wiper switch in the HI position
causes the wipers to operate at high speed.

l When the wiper switch is placed in the OFF
position, the cam contacts of wiper motor
causes current to flow through the auto wiper
stop circuit, allowing the wiper blades to cycle
before they reach to the stop positions.

l When the washer switch is placed in the ON
position with the ignition switch in the ACC or
ON position, washers operate.
REAR WIPER AND WASHER
OPERATION

/l
i,When the rear wiper switch is placed in the ON
position with the ignition switch in the ACC or
ON position, wipers operate continuously at low
speed.

lWhen the rear wiper switch is placed in the OFF
position, the cam contacts of wiper motor
causes current to flow through the auto wiper
stop circuit, allowing the wiper blades to cycle
before they reach to the stop positions.

lWhen the rear wiper switch is placed in the
INTposition with the ignition switch in ACC or ON
position, the rear intermittent wiper relay is
energized causing the rear intermittent wiper
relay contacts to close and open repeatedly.
lWhen the contacts are closed, the wiper motor
is energized.
lWhen the rear wiper motor is energized, the rear
intermittent wiper relay contacts open; howev-
er, the cam contacts keep the rear wiper motor
energized until the wiper blades return to their
stop position.
LTROUBLESHOOTING HINTS
1. Wipers do not operate.
(1) Washer is not operative, either.
l Check multi-purpose fuse No.
0.l Check ground.
2.Low-speed (or high-speed) wiper operation only
is inoperative.
l Check wiper switch.
3. Wipers do not stop.
l
.Check wiper motor.
l Check intermittent wiper relay.
l Check wiper switch.
4. Washer is inoperative.
l Check washer motor.
l Check washer switch.
NOTEFor information concerning the ETACS control unit,
refer to
P.51-24.TROUBLESHOOTING HINTS
1. Wipers do not operate.
(1) Washer is not operative, either.
l Check multi-purpose fuse No.
@.l Check ground.
2. Low-speed wiper operation only is inoperative.
l Check wiper switch.
3. Wipers do not stop.
l Check wiper motor.
l Check rear intermittent wiper relay.
l Check rear wiper switch.
4. Intermittent wiper operation is inoperative.
lCheck terminal voltage of the rear intermit-
tent wiper relay energized.
(Refer to
P.51-34 for information concerning
the installation position of the intermittent
wiper relay.)
TerminalNo.Voltage
I
Check
2OVRear intermittent wiper
relay or rear wiper switch12v
Rear intermittent wiperrelay0 f-, 12v
-(Normal)(alternating)5. Washer is inoperative.
l Check washer motor.
l Check washer switch
TSB Revision

EXTERIOR - Windshield Wiper and Washer51-25
TROUBLESHOOTING QUICK-REFERENCE TABLE
INTERMITTENT WIPERSProblem
The wipers don’t operate when
the wiper switch is set to the
“INT” position.
[The wipers do operate, however,
when the wiper switch is set to
the “1” (low speed) position.]Probable cause(s)Checking procedureRemedy
Damage or disconnectionIf a malfunction is discov-
of the wiring of the wiperRepair the wiring
har-ered as a result of the
switch
(“INT”) inputness, or replace the
checking of the inputcolumn switch.
circuit.(P.51-24). conduct check
No. 2 (P.51-28) of the
Damage or disconnectionindividual part and
of the wiring of the wipercircuit.
switch
(“INT”).Damage or disconnectionIf a malfunction is discov-
of the wiring of theRepair the wiring
har-ered as a result of theness.
ignition switch input
circuit.checking of the input
(P.51-24). conduct check
No. 1 (P.51-27) of the
individual part and circuit.
Damage or disconnectionConduct check No. 4Repair the wiring
har-of the wiring of the wiper(P.51-30) of the individualness, or replace the
relay activation circuit.part and circuit.column switch.
Malfunction of the wiper
relay.
The wipers don’t stop when
the wiper switch is OFF.
IThis problem occurs at the low;p;$ of the wipers.)
If the wipers continue operating{without stopping) at the “2”
sosition (high speed) of the
uiper switch, there is a
short-circuit in the circuit at the
Ylviper motor high-speed side.
JVhen the wiper switch is set to
the “INT” position, the wipers
operate continuously at low
speed, not intermittent
operation.
IThe wipers stop, however, when:he wiper switch is set to
“OFF”.)
The intermittent time does not:hange when the intermittent
Jariable volume switch setting
s changed.Malfunction of the
elec--Replace the electronic
tronic control unit.control unit.
Short-circuit in the wiperIf a malfunction is discov-
switch
(“INT”) inputRepair the wiring har-ered as a result of theness, or replace the
circuit.checking of the inputcolumn switch.
(P.51-24). conduct check
Short-circuit in the wiperNo. 2 (P.51-28) of the
switch (“INT”).individual part and circuit.
Short-circuit in the wiperConduct check No. 4Repair the wiring
har-relay activation circuit.(P.51-30) of the individualness.
part and circuit.
Malfunction of the elec-
-Replace the electronic
tronic control unit.control unit.
Short-circuit in the wiperIf a malfunction is discov-Repair the wiring
har-switch
(“INT”) inputered as a result of theness. or replace the
circuit.checking of the inputcolumn switch.
(P.51-24). conduct check
Short-circuit in the wiperNo. 2 (P.51-28) of the
switch (“INT”).individual part and circuit.
Malfunction of the elec-
-Replace the electronic
tronic control unit.control unit.
Damage or disconnectionIf a malfunction is discov-Repair the wiring
har-of the wiring of the inter-ered as a result of theness, or replace the
mittent variable volumecolumn switch.
switch input circuit.checking of the input
(P.51-24). conduct check
No. 3 (P.51-29) of the
Damage or disconnection
of the wiring of the inter-individual part and circuit.
mittent variable volume
switch.
Malfunction of the
elec-tronic control unit.-Replace the electronic
control unit.
TSB Revision

51-26EXTERIOR - Windshield Wiper and Washer
MIST WIPERS/WASHER-INTERLOCKED WIPERS
ProblemProbable cause(s)
Checking procedureRemedy
The wipers do not function when
the washer switch is switched ONDamage or disconnectionIf a malfunction is discov-
of the wiring of the
ered as a result of theRepair the wiring
har-for 0.6 second or longer.
(With the wiper switch at thewasher switch input
circuit.checking of the inputness, or replace the
column switch.
“INT” position, however, inter-
mittent operation of the wipers
is normal, and the washer
function is normal.)
(P.51-241, conduct check
Damage or disconnectionNo.5(P.51-31)oftheindividual part and circuit,
of the wiring of the
washer switch.
Malfunction of the elec-tronic control unit.
-Replace the electronic
control unit.
The wipers do not function whenMalfunction of the elec-
-the washer switch is switched ONtronic control unit.Replace the electronic
for less than 0.6 second.control unit.
(The wipers and washer do func-
tion, however, when the washer
switch is switched ON for 0.6
second or longer.)
NOTE“ECU” (electronic control unit) indicates the ETACS unit.
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51-28EXTERIOR - Windshield Wiper and Washer
2. WIPER SWITCH
‘ANT” INPUT CIRCUIT
Iin,Ullnl,,en, ll”lC I”,CI”,IIdctcclion CIICUI,
5v
i-i
7 ;;:2
A3II--
ETACS unrt‘,ij I
Wrperswitch
Lolumn switch
” J/B
“I : Vehicles without theft-alarm system“2: Vehicles with theft-alarm system16FO320
Operation Description
L+,When the wiper switch is set to the “INT” position, LOW-level signals are input to the electronic control unit;
the intermittent time interval detection circuit is then activated, and the wipers operate at the intermittent
time interval according to the setting of the intermittent variable volume switch.
Electronic Control Unit Terminal Voltage (Connection Status of Electronic Control Unit Connector)
ECUterminal No.
9”’
1 1 *2
Signal
Wiper switch “INT” signalStatus
Wiper switch “OFF”Wiper switch “INT”
Terminal
voltage
5Vov
Checking the Wiper Switch
(“INT” Position) Circuit (Disconnect the ECU Connector and Check at the
Wiring Harness Side.)
ECUConnected to/measured
terminal No.componentMeasurement TesterconnectionCheck conditionsStandardWiper switch “INT”
No continuityChecking Individual Part
Wiper switch: Refer to
P.51-33.
NOTE
*l : Vehicles without theft-alarm system
“2: Vehicles with theft-alarm system
TSB Revision

EXTERIOR - Windshield WiDer and Washer51-315. WASHER SWITCH INPUT CIRCUIT
lgnitlon swatch (ACC)
Columnswitch
ETACS unit(ECU)*,
-7-l
Junction block15~ @ (Multi-purpose fuse)
ON-time detec-\I\I1a
“I : Vehicles without theft-alarm system
“2: Vehicles with theft-alarm system16FO323
Operation Description
While the washer switch is ON, HIGH-level signals are sent to the washer switch ON-time detection circuit
simultaneous with the activation of the washer motor, thus causing the transistor to be switched ON and the
wipers to be activated for a certain fixed time.
Electronic Control Unit Terminal Voltage (Connection Status of Electronic Control Unit Connector)
ECUterminal No.58”’
60*2Signal
Washer switch signal
Status
Ignition switch
“ACC”Washer switch “OFF”Washer switch “ON“
Terminal
voltageov
System
voltage
NOTE*I : Vehicles without theft-alarm system
“2: Vehicles with theft-alarm systemChecking Individual Part
Washer switch: Refer to
P.51-33
1 TSB Revision