Mitsubishi Lancer (4A9 engine). Manual - part 203

HANDS FREE ECU

CHASSIS ELECTRICAL

54A-474

DIAGNOSIS PROCEDURE

STEP 1. Check the multivision display operation.
Check if the multivision display work normally and 
the sound is output.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Troubleshoot the MMCS. (Refer to .)

STEP 2. Connector check: C-41 hands free ECU 
connector, C-141 multivision display connector

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the defective connector.

STEP 3. Check the wiring harness between C-41 
hands free ECU connector terminal No.2, 16 and 
C-141 multivision display connector terminal 
No.83, 84.

• Check the signal lines for open circuit and short 

circuit.

NOTE: Prior to the wiring harness inspection, check 
intermediate connectors C-140 and repair if neces-
sary.

Q: Is the check result normal?

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 .)

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 multivision display.

HANDS FREE ECU

CHASSIS ELECTRICAL

54A-475

Inspection Procedure 7: Steering wheel voice control switch illumination does not come on.

CAUTION

Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communica-
tion circuit are normal.

CLOCK
SPRING

INTERFACE
CIRCUIT

COMBINATION
METER

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

AC701093 AU

Connector: C-01 <LHD>

AC701122 BH

Connector: C-01 <RHD>

HANDS FREE ECU

CHASSIS ELECTRICAL

54A-476

TECHNICAL DESCRIPTION (COMMENT)
The power supply circuit to the steering wheel voice 
control switch, the steering wheel voice control 
switch, the combination meter, or the clock spring 
may be defective.

PROBABLE CAUSES

• Malfunction of steering wheel voice control switch

• Malfunctions of combination meter

• Malfunction of the clock spring

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-209 steering wheel 
voice-control switch connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

STEP 2. Voltage measurement at C-209 steering 
wheel voice control switch connector.
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Turn the ignition switch to the "ACC" position, and 

turn the tail lamp switch to the "ON" position.

(3) Measure the voltage between terminal No.4 and 

body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Go to Step 5.

STEP 3. Check the wiring harness between C-209 
steering wheel voice control switch connector 
terminal No.1 and body earth.

• Check the earth wire for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the wiring harness.

STEP 4. Check the steering wheel voice control 
switch.
Check the illumination of the steering wheel voice 
control switch. (Refer to steering wheel voice control 
switch inspection. )

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Replace the steering wheel voice control 
switch.

STEP 5. Connector check: C-204 and C-205 clock 
spring connectors

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

STEP 6. Check the clock spring.
Check whether the clock spring is in good condition. 
Refer to GROUP 52B 

− Driver’s Air bag module and 

clock spring .

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Replace the clock spring.

STEP 7. Check the wiring harness between C-209 
steering wheel voice control switch connector 
terminal No.4 and C-204 clock spring connector 
terminal No.1.

• Check the power supply lines open and short cir-

cuit.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the wiring harness.

STEP 8. Connector check: C-01 combination 
meter connector

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the defective connector.

AC612708 AS

Connectors: C-204, C-205, C-209 <LHD>

C-209 (Y)

C-204

C-205

AC612716 AJ

Connectors: C-204, C-205, C-209 <RHD>

C-205

C-204

C-209 (Y)

HANDS FREE ECU

CHASSIS ELECTRICAL

54A-477

STEP 9. Check the wiring harness between C-01 
combination meter connector terminal No.23 and 
C-205 clock spring connector terminal No.6.

• Check the power supply line for open and short 

circuit.

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Repair the wiring harness.

STEP 10. Retest the system
Check whether the illumination of the steering wheel 
voice control switch comes on 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 steering wheel voice control 
switch.

Inspection Procedure 8:Voice guide "Unable to obtain vehicle speed. Please try again or contact your 
dealer for service" is sent from the speaker. <Vehicles with radio and CD player>

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 voice guide "Unable to obtain vehicle speed. 
Please try again or contact your dealer for service" is 
sent from the speaker, the vehicle speed signal of 
hands free ECU has a problem. At this time, the 
hands free ECU, and the vehicle speed signal of 
radio and CD player may have a problem.

PROBABLE CAUSES

• The hands free ECU may be defective.

• The radio and CD player may be defective.

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the combination meter.
Check whether the speed meter works normally. 
(Refer to .)

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Diagnose the combination meter (Refer to 
Combination meter 

− Troubleshooting ).

STEP 2. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the CAN bus line (Refer to GROUP 
54C 

− Troubleshooting ).

STEP 3. M.U.T.-III other system diagnosis code
Check again if the diagnosis code is set to the radio 
and CD player.

Q: Is the diagnosis code set?

YES : 

Troubleshoot the radio and CD player 

(Refer to Diagnosis Code Chart ).

NO : 

Go to Step 4.

STEP 4. Check the diagnosis mode
Check if the hands free ECU can be switched to the 
diagnosis mode.(Refer to .)

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

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

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.