1997 MITSUBISHI TRITON ECU
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CHASSIS ELECTRICAL ± Headlamp54-42
Inspection Procedure 4
Driver's side door switch input circuit system check
Door switch continuity check (Refer to
GROUP 42 ± Door Assembly.)NG
Replace
OK
Door switch earth checkNG
Repair
OK
Disconnect the door switch connector
D-17 and measure at the harness side.
Voltage between the terminal No.
2 and body earth
OK:5 VNGCheck the following connectors:
C-87, C-91, D-17, D-21NG
Repair
OK
Check trouble symptom.NGCheck the harness wire between the
door switch and junction block, and re-
pair if necessary.OK
Check trouble symptom.
NG
Replace the buzzer-ECU or ETACS-
ECU.
Page 893 of 1310
CHASSIS ELECTRICAL ± Headlamp54-44
Inspection procedure 6
The headlamps do not illuminate when the vehicle is in the
following condition and the ignition switch is moved to the
ON position. However, they illuminate when the lighting
switch is moved to the HEAD position.
Lighting switch: OFF
Passing switch: OFF
Probable cause
The cause is probably a malfunction of the daytime running lamp control unit (DRL-ECU)
circuit system. If there is a blown fuse, there may also be a short-circuit in a harness.Malfunction of fuse
Malfunction of connector
Malfunction of harness wire
Malfunction of the DRL relay (1)
Malfunction of the DRL-ECU
DRL relay (1) check
(Refer to P.54-50.)NG
Replace
OK
Disconnect the DRL relay (1) connector
A-12 and measure at the harness side.
Ignition switch: ON
1. Voltage between terminal No.4 and
earth
OK:System voltage
2. Voltage between terminal No.3 and
earth
OK:System voltage when the
lighting switch is at HEAD and
0 V when it is at OFF.
3. Continuity between terminal No.1
and earth
OK:Continuity1. NGCheck the following connectors:
A-12, A-16, C-81, C-88NG
Repair
OK
Check trouble symptoms.NGCheck the harness wire between the
DRL relay (1) and the ignition switch.
Repair, if necessary.
2. NGCheck the following connectors:
A-12, A-16, A-20, A-34NG
Repair
OK
Check trouble symptoms.NGCheck the harness wire between the
DRL relay (1) and the headlamp. Repair,
if necessary.
3. NGCheck the following connectors:
A-12, A-19NG
Repair
OK
Check trouble symptoms.NGCheck the harness wire between the
DRL relay (1) and the body earth. Repair,
if necessary.OK
Malfunction of the DRL-ECU
Replace
Page 894 of 1310
CHASSIS ELECTRICAL ± Headlamp54-45
Inspection procedure 7
The headlamps do not switch off when the vehicle is in the
following condition and the lighting switch is moved to the
TAIL position.
Ignition switch: OFF
Passing switch: OFF
Probable cause
The cause is probably a malfunction of the daytime running lamp control unit (DRL-ECU)
circuit system. If there is a blown fuse, there may also be a short-circuit in a harness.Malfunction of fuse
Malfunction of connector
Malfunction of harness wire
Malfunction of the tail lamp relay
Malfunction of the DRL-ECU
Lighting switch check
(Refer to P.54-49.)NG
Replace
OK
Disconnect DRL-ECU connector A-10
and measure at the harness side.
Continuity between terminal No.10
and earth
OK:ContinuityNGCheck the following connectors:
A-10, A-19NG
Repair
OK
Check trouble symptoms.NGCheck the harness wire between the
DRL-ECU and the body earth. Repair,
if necessary.
OK
Tail lamp relay check
(Refer to P.54-49.)NG
Replace
OK
Disconnect the DRL-ECU connector
A-10 and measure at the harness side.
Voltage between terminal No.5 and
earth
OK: System voltageNGCheck the following connectors:
A-10, A-16, A-55XNG
Repair
OK
Check trouble symptoms.NGCheck the harness wire between the
DRL-ECU and the fusible link No.3. Re-
pair, if necessary.OK
Malfunction of the DRL-ECU
Replace
Page 914 of 1310
CHASSIS ELECTRICAL ± Radio and Tape Player54-65
A-4 Broadcasts can be heard but both AM and FM have a lot of noise.
(1)(2)
Noise occurs when the engine is stopped.
Ye s
Do the following measures eliminate the noise?
Tune to a station with a strong signal.
Extend the antenna completely.
Adjust the sound quality to suppress high tones.Ye s
OK
No
Is the radio body earth mounted securely?NoSecurely tighten the nuts for the body
earth.
Ye s
Is the antenna plug properly connected to the radio?NoCorrectly attach the antenna plug.
Ye s
Is the antenna itself in good condition or is it properly
mounted?NoClean the antenna plug and earth wire
mounting area. Mount the antenna se-
curely.
Ye s
If there is more noise than other radios, consult a service
centre.
Is the noise eliminated?
NoYe s
OK
Noise occurs when the engine in running.
Inspect the vehicle's noise suppressor. (Refer to A-6.)
NOTE
About noise encountered during FM reception only.
Due to differences in FM and AM systems, FM
is not as susceptible as AM to interference from
engines, power lines, lightning, etc. On the other
hand, there are cases due to the characteristicsof FM waves of noise or distortion generated by
typical noise interference (first fading and
multipath). (Refer to A-2.)
problem with the radio.>
Page 918 of 1310
CHASSIS ELECTRICAL ± Radio and Tape Player54-69
A-8 Noise sometimes appears on FM during travelling.
Does the problem clear up when retuned?Ye sOK
No
Does the problem appear only in certain locations and only with
certain stations?Ye sDue to electrical field conditions. (Multipath noise*, fading noise*).
Are connectors properly connected?NoCheck connector connections.
Ye s
Does noise appear when the radio switch is turned on while the
vehicle is stopped and the radio is struck while tuned away from
a station?NoStatic electricity noise:
Body static electric from the shock absorber rubber bushings used
to prevent vibration, tyres, etc. occurs because of separation from
the earth, causing a buzzing noise. Since no measures can be
taken on the radio side, other steps should be taken to discharge
the static electricity of the vehicle body.
Ye s
Is the radio body correctly earthed? (Is the mounting screw tightened
securely?)NoTighten the screw securely.
Ye s
Is the antenna correctly earthed? (If noise appears when the antenna
is moved, this means the earth is not securely connected.)NoIf rust is present at the antenna earth screw, clean and tighten
the earth securely.
Ye s
Repair or replace radio.
No
* About multipath noise and fading noise
Because the frequency of FM waves is
extremely high, it is highly susceptible to effects
from geological formations and buildings.
These effects disrupt the broadcast signal and
obstruct reception in several ways.
Multipath noise
This describes the echo that occurs when
the broadcast signal is reflected by a largeobstruction and enters the receiver with
a slight time delay relative to the direct
signal (repetitious buzzing).
Fading noise
This is a buzzing noise that occurs when
the broadcast beam is disrupted by
obstructing objects and the signal strength
fluctuates intricately within a narrow range.
Page 919 of 1310
CHASSIS ELECTRICAL ± Radio and Tape Player54-70
A-9 Ever-present noise.
Noise is often created by the following factors, and
often the radio is OK when it is checked individually.
Travelling conditions of the vehicle
Terrain of area travelled through
Surrounding buildings
Signal conditions
Time periodFor this reason, if there are still problems with noise
even after the measures described in steps A-1
to A-8 have been taken, get information on the
factors listed above as well as determining whether
the problem occurs with AM or FM, the station
names, frequencies, etc., and contact a service
centre.
B. RADIO
B-1 No power is supplied when the switch is set to ON.
Is dedicated fuse No. 4 blown or is the circuit open?Ye sReplace fuse or repair harness.
No
Is the connector at the back of the radio connected properly?NoConnect connector securely.
Ye s
Disconnect and check the connector at the rear of the radio. Is
the ACC power (12 V) being supplied to the radio?NoRepair harness.
Ye s
Repair or replace radio.
B-2 No sound from one speaker.
Check to see if there is any sound when
attached to another radio.Ye sRepair or replace radio.
No
Remove the connector on the back of
the radio and check the speaker harness
for conductance.Ye sIt conducts electricity but is shorted out.Repair speaker harness.
No
Check the speaker for conductance.Ye sRepair speaker harness and ensure
proper connection of relay connectors.
No
Repair or replace speaker.
Page 921 of 1310
CHASSIS ELECTRICAL ± Radio and Tape Player54-72
B-5 Distortion on AM or on both AM and FM.
How much distortion is there?OccasionalDistortion in the vicinity of the radio sta-
tionYe sExcessive antenna input
Constant
No
Are the speaker cords in contact with the cone paper?Ye sRemove cords away from cone paper.
No
Remove the speakers and check for torn cone paper or foreign
objects.Ye sRepair or replace speakers.
No
Check for deformation with speaker installed.Ye sInstall speaker securely.
No
Repair or replace radio.
B-6 Distortion on FM only
Does the distortion persist when the radio is tuned to another station?NoDue to weak electrical field of radio station
Ye s
Does distortion increase or decrease when the vehicle is moved?Ye sDue to multipath noise
No
Repair or replace radio.
B-7 Too few automatic select stations.
OK
Is the check being conducted under spe-
cial electrical field conditions?Ye s
Example: In an underground
garage or inside a building
No
Is the antenna plug properly connected to the equipment?
Is proper performance obtained when
the vehicle is moved?
Ensure proper connection.No
No
Ye s
Repair or replace radio.Ye sDoes the equipment work properly if the radio is changed?
No
Replace the antenna.Ye s
Page 926 of 1310
CHASSIS ELECTRICAL ± Radio and Tape Player54-77
RADIO AND TAPE PLAYER WITH ANTI-THEFT SYSTEM54400430032
After the power supply to the radio and tape
player has been interrupted for an hour or more,
the anti-theft system will prevent the radio and
tape player from working, even if the powersupply is restored. Problem with the anti-theft
system can be found using the flow chart below.
When the ignition key is in the ACC or ON position and the POWER
button is pressed, does ªCODEº appear on the display?NoCheck and repair the connector or harness.
Ye s
Can the security code be input to the display using the memory
select buttons?NoRepair or replace the radio and tape player.
Ye s
If the BAND button is pressed after security code has been input,
do the radio and tape player then work?Ye sNormal
No
If the security code is not accepted, is ª1 ERRORº displayed for
two seconds and then changes into ªcodeº to wait for the next
input?NoRepair or replace the radio and tape player.
Ye s
If the BAND button are pressed after the security code has been
input again by means of the memory select buttons, do the radio
and tape player then work?Ye sNormal (an incorrect code was input the first time)
No
If the security code is not accepted, is ª2 ERRORº displayed for
two seconds and then changes into ªcodeº to wait for the next
input?NoRepair or replace the radio and tape player.
Ye s
If the BAND button are pressed after the security code has been
input again by means of the memory select buttons, do the radio
and tape player then work?Ye sNormal (an incorrect code was input the second time)
No
If the security code is not accepted, ª3 ERRORº is displayed for
five seconds and then changes into ªOFFº. Then the security code
can not be input any more. To input the security code again, turn
the ignition switch to the ACC or ON position and wait for one
hour when ªOFFº is displayed. After ªOFFº disappears on the display
and changes into ªcodeº, the security code can be input again.