Mitsubishi L200. Manual — part 763

HANDS FREE-ECU

CHASSIS ELECTRICAL

54A-419

Inspection Procedure 4: When the speech switch is pressed, the voice information is not output.

CAUTION

Before replacing the hands free ECU, ensure that the power supply circuit, the earth circuit and the
communication circuit are normal.

Steering Wheel Voice Control Switch Circuit

CLOCK
SPRING

STEERING
WHEEL
AUDIO
REMOTE
CONTROL
SWITCH

STEERING
WHEEL
VOICE
CONTROL
SWITCH

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple SI : Silver

RADIO AND CD PLAYER
OR
MULTIVISION DISPLAY

VEHICLES WITH MMCS

:

VEHICLES WITH RADIO AND CD PLAYER

:

NOTE

HANDS FREE-ECU

CHASSIS ELECTRICAL

54A-420

COMMENTS ON TROUBLE SYMPTOM
If the voice information is not output when the
speech switch is pushed, the communication
between the radio and CD player <vehicles with
radio and CD player> or multivision display <vehicles
with MMCS> and the hands free ECU, or the com-
munication between the radio and CD player and the
steering wheel voice control switch, the hands free
ECU, or the steering wheel voice control switch may
have a problem.

PROBABLE CAUSES

• The hands free ECU may be defective.

• The radio and CD player may be defective.

<vehicles with radio and CD player>

• The multivision display may be defective. <vehi-

cles with MMCS>

• The steering wheel audio remote control switch

may be defective.

• The steering wheel voice control switch may be

defective.

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the diagnosis mode
Check if the hands free ECU can be switched to the
diagnosis mode. (Refer to

P.54A-403

<Using radio

and CD player> or

P.54A-406

<Using multivision dis-

play>.)

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Perform Inspection Procedure 5
"DIAGNOSIS MODE cannot be made an
entry." (Refer to

P.54A-421

.)

STEP 2. Operation check of the steering wheel
audio remote control switch
Check that the radio and CD player <vehicles with
radio and CD player> or multivision display <vehicles
with MMCS> can be operated by the steering wheel
audio remote control switch.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Troubleshoot the steering wheel audio
remote control switch. Refer to

P.54A-383

.

STEP 3. Check the steering wheel voice control
switch.
Check the continuity of the steering wheel voice con-
trol switch.

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Replace the steering wheel voice control
switch.

STEP 4. Check the steering wheel audio remote
control switch.
Check the continuity of the steering wheel audio
remote control switch. (Refer to steering wheel audio
remote control switch inspection.)

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Replace the steering wheel audio remote
control switch.

STEP 5. Check the harness wire between C-311
steering wheel audio remote control switch
connector terminal No. 3 and C-312 steering
wheel voice control switch connector terminal
No.3.

• Check the communication lines for open circuit

and short circuit.

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Repair the wiring harness.

STEP 6. Connector check: C-310 clock spring
connector.

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Repair the defective connector.

STEP 7. Check the harness wire between C-310
clock spring connector terminal No. 4 and C-312
steering wheel voice control switch connector
terminal No.2.

• Check the communication lines for open circuit

and short circuit.

Q: Is the check result normal?

YES :

Go to Step 8.

NO :

Repair the wiring harness.

STEP 8. Temporarily replace the steering wheel
voice control switch, and check the trouble
symptom.

Q: Is the check result normal?

YES :

Replace the steering wheel voice control

switch.

NO :

Replace the radio and CD player <vehicles
with radio and CD player> or multivision
display <vehicles with MMCS>.

HANDS FREE-ECU

CHASSIS ELECTRICAL

54A-421

Inspection Procedure 5: DIAGNOSIS MODE cannot be made an entry.

CAUTION

Before replacing the hands free ECU, ensure that the power supply circuit, the earth circuit and the
communication circuit are normal.

COMMENTS ON TROUBLE SYMPTOM
If the diagnosis mode cannot be made an entry, the
hands free ECU, the communication between the
hands free ECU, and the radio and CD player <vehi-
cles with radio and CD player> or multivision display
<vehicles with MMCS>, or the power supply system
of the hands free ECU may have a problem.

PROBABLE CAUSES

• The hands free ECU may be defective.

• The radio and CD player may be defective.

<vehicles with radio and CD player>

• The multivision display may be defective. <vehi-

cles with MMCS>

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the radio and CD player <vehicles
with radio and CD player> or multivision display
<vehicles with MMCS> operation.
Check if the radio and CD player <vehicles with radio
and CD player> or multivision display <vehicles with
MMCS> work normally and the sound is output.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Troubleshoot the radio and CD player

P.54A-232

<vehicles with radio and CD

player> or multivision display

P.54A-314

<vehicles with MMCS>.

STEP 2. Connector check: C-173 hands free ECU
connector, C-126 radio and CD player connector
<vehicles with radio and CD player>, C-168
multivision display connector <vehicles with
MMCS>

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the defective connector.

STEP 3. Check the wiring harness between C-173
hands free ECU connector terminal No.2, 16 and
C-126 radio and CD player connector terminal
No.29, 40 <vehicles with radio and CD player> or
C-168 multivision display connector terminal
No.73, 74 <vehicles with MMCS>.

• Check the signal lines for open circuit and short

circuit.

Q: Is the check result normal?

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple SI : Silver

Hands-Free ECU Communication Circuit

HANDS-FREE ECU

RADIO AND CD PLAYER
OR
MULTIVISION DISPLAY

VEHICLES WITH MMCS

:

VEHICLES WITH RADIO AND CD PLAYER

:

NOTE

HANDS FREE-ECU

CHASSIS ELECTRICAL

54A-422

YES :

Go to Step 4.

NO :

Repair the wiring harness.

STEP 4. Check if the power supply circuit of
hands free ECU have a problem.
Perform the Inspection procedure 1 "Check the
hands free ECU power supply circuit." of the trouble-
shooting. (Refer to

P.54A-411

.)

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Repair according to the troubleshooting for
reference.

STEP 5. Replace the hands free ECU temporarily,
and check the trouble symptom.

Q: Is the check result normal?

YES :

Replace the hands free ECU.

NO :

Replace the radio and CD player <vehicles
with radio and CD player> or multivision
display <vehicles with MMCS>.

Inspection Procedure 6: Steering wheel voice control switch illumination does not come on.

CAUTION

Before replacing the hands free ECU, ensure that
the power supply circuit, the earth circuit and the
communication circuit are normal.

TECHNICAL DESCRIPTION (COMMENT)
The power supply circuit to the steering wheel voice

control switch, the steering wheel voice control
switch, or the clock spring may be defective.

TAIL LAMP
RELAY

ETACS-ESU

CLOCK
SPRING

Steering Wheel Voice Control Switch Illumination Circuit

STEERING
WHEEL
VOICE
CONTROL
SWITCH

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple SI : Silver