Mitsubishi L200. Manual — part 691
HEADLAMP
CHASSIS ELECTRICAL
54A-131
DIAGNOSIS PROCEDURE
STEP 1. Connector check: A-58 <headlamp (LO:
LH)>, A-147 <headlamp (LO: RH)>, A-59 (HI: LH),
A-146 (HI: RH) headlamp connector
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the defective connector.
STEP 2. Bulb check
Check the bulb(s) of headlamp that does not illumi-
nate.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Replace the bulb(s) of the lamp that does
not illuminate.
STEP 3. Resistance measurement at the A-58
<headlamp (LO: LH)>, A-147 <headlamp (LO:
RH)>, A-59 (HI: LH), A-146 (HI: RH) headlamp
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the resistance between the connector of
lamp which does not illuminate and the body
AC903898
AH
Connectors: A-58, A-59
Harness side
A-58
A-59 (B)
Harness side
A-59
A-58 (B)
AC903897
AH
Connectors: A-146, A-147
Harness side
A-146
A-146 (B)
Harness side
A-147
A-147 (B)
AC903898
AH
Connectors: A-58, A-59
Harness side
A-58
A-59 (B)
Harness side
A-59
A-58 (B)
AC903897
AH
Connectors: A-146, A-147
Harness side
A-146
A-146 (B)
Harness side
A-147
A-147 (B)
HEADLAMP
CHASSIS ELECTRICAL
54A-132
earth.
•
Measure the resistance between the A-58 head-
lamp (LO: LH) connector terminal No. 1 and
the body earth.
• Measure the resistance between the A-147
headlamp (LO: RH) connector terminal No. 1
and the body earth.
•
Measure the resistance between the A-59 head-
lamp (HI: LH) connector terminal No. 1 and
the body earth.
• Measure the resistance between the A-146
headlamp (HI: RH) connector terminal No. 1
and the body earth.
OK: Continuity exists (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 4.
STEP 4. Check the wiring harness from A-58
<headlamp (LO: LH)>, A-147 <headlamp (LO:
RH)>, A-59 (HI: LH), A-146 (HI: RH) headlamp
connector (terminal No.1) to body earth
• Check the earth wires for open circuit.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
Use Troubleshooting/inspection Service
Points
− How to Cope with Intermittent
Malfunction ).
NO :
Repair the wiring harness.
AC310506
Connectors A-58, A-147
(Harness side)
LH
AC310506
Connectors A-59, A-146
(Harness side)
LI
AC903898
AH
Connectors: A-58, A-59
Harness side
A-58
A-59 (B)
Harness side
A-59
A-58 (B)
AC903897
AH
Connectors: A-146, A-147
Harness side
A-146
A-146 (B)
Harness side
A-147
A-147 (B)
HEADLAMP
CHASSIS ELECTRICAL
54A-133
STEP 5. Check the wiring harness from A-58
<headlamp (LO: LH)>, A-147 <headlamp (LO:
RH)>, A-59 (HI: LH), A-146 (HI: RH) headlamp
connector (terminal No.2) to A-22X headlamp
relay (LO) or A-23X headlamp relay (HI)
connector (terminal No.3)
• Check the power supply line for open circuit and
short circuit.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the wiring harness.
STEP 6. Retest the system
Check that the headlamps illuminate normally.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
Use Troubleshooting/inspection Service
Points
− How to Cope with Intermittent
Malfunction ).
NO :
Replace the headlamp socket.
AC903878
AG
Connectors: A-22X, A-23X
Relay box side
A-22X, A-23X
A-23X
A-22X
AC903898
AH
Connectors: A-58, A-59
Harness side
A-58
A-59 (B)
Harness side
A-59
A-58 (B)
AC903897
AH
Connectors: A-146, A-147
Harness side
A-146
A-146 (B)
Harness side
A-147
A-147 (B)
HEADLAMP
CHASSIS ELECTRICAL
54A-134
Inspection Procedure 6: The headlamp automatic-shutdown function does not work normally.
CAUTION
Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.
COMMENTS ON TROUBLE SYMPTOM
The ETACS-ECU operates this function in accord-
ance with the input signals below.
• Ignition switch (IG1)
• Driver's door switch
• Tail lamp switch
• Headlamp switch
If this function does not work normally, these input
signal circuit(s) or the ETACS-ECU may be defec-
tive.
PROBABLE CAUSES
• Malfunction of the driver's door switch
• Malfunction of the column switch
• Malfunction of the ETACS-ECU
• Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. Check of adjustment details for the
headlamp automatic-shutdown
Check that the headlamp automatic-shutdown func-
tion is set to "B-spec" using the customise function of
M.U.T-III.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Using the customise function of M.U.T-III,
set the headlamp automatic-shutdown
function to "B-spec."
STEP 2. M.U.T.-III diagnosis code.
When the ignition switch is turned to the "LOCK"
(OFF) position, check that the ETACS-ECU does not
set the diagnosis code.
Q: Is the diagnosis code set?
YES :
Refer to diagnosis code chart
.
NO :
Go to Step 3.
STEP 3. M.U.T.-III data list
Check the input signals below, which are related to
the headlamp automatic-shutdown function.
• Turn the ignition switch to the "LOCK" (OFF)
position.
• Open the drive’s door.
• Turn the headlamp switch to the ON position.
OK: Normal conditions are displayed for all
the items
Q: Are the check result normal?
AC505478
ETACS-ECU
INPUT SIGNAL
· DRIVER'S DOOR SWITCH
· TAIL LAMP SWITCH (COLUMN-ECU)
· IGNITION SWITCH (IG1)
· HEADLAMP SWITCH (COLUMN-ECU)
Headlamp Automatic Shutdown Function
AB
Item
No.
Item name
Normal condition
19
Drive’s door switch
ON
30
Ignition switch(IG1)
OFF
60
Headlamp output
ON
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