Mitsubishi Lancer (4A9 engine). Manual - part 196

USB BOX

CHASSIS ELECTRICAL

54A-446

2. Check that the continuity exists between the front 

side terminals of USB adapter and rear side ter-
minals of USB adapter.

AC900440

AB

Front side

Rear side

1

2

3

4

4

3

2

1

Front side 
terminal

Rear side 
terminal

Measurement 
value

1

1

Continuity 
exists (2 

Ω or 

less)

2

2

3

3

4

4

HANDS FREE ECU

CHASSIS ELECTRICAL

54A-447

HANDS FREE ECU

SPECIAL TOOLS

M1544403500168

HANDS FREE ECU

CHASSIS ELECTRICAL

54A-448

Tool

Number

Name

Use

MB991955

a. MB991824
b. MB991827
c. MB991910
d. MB991911
e. MB991825
f. MB991826

M.U.T.-III sub-
assembly

a. Vehicle 

Communication 
Interface (V.C.I.)

b. M.U.T.-III USB 

cable

c. M.U.T.-III main 

harness A 
(Vehicles with CAN 
communication 
system)

d. M.U.T.-III main 

harness B 
(Vehicles without 
CAN 
communication 
system)

e. M.U.T.-III measure 

adapter

f. M.U.T.-III trigger 

harness

CAUTION

For vehicles with CAN 
communication, use M.U.T.-III 
main harness A to send 
simulated vehicle speed. If you 
connect M.U.T.-III main harness 
B instead, the CAN 
communication does not 
function correctly.
CAN bus diagnostics, diagnosis 
code or service data check.

MB991223

a. MB991219
b. MB991220
c. MB991221
d. MB991222

Harness set

a. Check harness
b. LED harness
c. LED harness 

adapter

d. Probe

Continuity check and voltage 
measurement at harness wire or 
connector

a. For checking connector pin 

contact pressure

b. For checking power supply 

circuit

c. For checking power supply 

circuit

d. For connecting a locally 

sourced tester

MB991910

MB991826

MB991955

MB991911

MB991824

MB991827

MB991825

a

b

c

d

e

f

DO NOT USE

MB991223

a

d

c

b

DO NOT USE

BA

HANDS FREE ECU

CHASSIS ELECTRICAL

54A-449

TROUBLESHOOTING

INTRODUCTION TO DIAGNOSIS

M1544404500105

Prior to the troubleshooting, check if the causes below can be the case. If any, take actions according to the 
solution method.
Pairing of the Bluetooth

®device (mobile phone or music player) and hands free ECU cannot be made. 

The hands free ECU does not recognize the Bluetooth

®device (mobile phone or music player) 

MB992006

Extra fine probe

Continuity check and voltage 
measurement at harness wire or 
connector

Tool

Number

Name

Use

MB992006

Cause

SOLUTION

The power of the 
bluetooth

®device is off.

With the power of the bluetooth

®device turned on, check the trouble 

symptom again.

In addition to the 
bluetooth

®device to be 

recognized, two or more 
bluetooth

®device exist in the 

vehicle.

• With the voice operation, select the device to be connected.

• Select the device to be connected on the multivision display. <Vehicles 

with MMCS>

Power supply abnormality in 
the hands free ECU, or 
communication error 
between the radio and CD 
player or multivition display, 
and hands free ECU.

Turn the ignition switch to the "ON" position and check if iPod connected to 
the USB adapter or USB device can be played. If the music cannot be 
played, the power supply of hands free ECU or the communication between 
the radio and CD player or multivition display, and hands free ECU may have 
a problem. Perform the Inspection procedure 2: The USB adapter data 
cannot be replayed. (Refer to  <Vehicles with radio and CD player> or  
<Vehicles with MMCS>.) If the diagnosis mode of hands free ECU can be 
made an entry, the ECU status can be checked by the hands free ECU self-
check, however, if the power supply of hands free ECU, or the 
communication with the radio and CD player or multivition display may have 
a problem, the ECU status can not be checked.(Refer to  <Vehicles with 
radio and CD player> or  <Vehicles with MMCS>.)