Mitsubishi Lancer (4A9 engine). Manual — part 212

DEFOGGER

CHASSIS ELECTRICAL

54A-510

A/C Control Panel Circuit

CPU

INTERFACE
CIRCUIT

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

HEATER
CONTROL
PANEL

OR
A/C
CONTROL
PANEL

HEATER
CONTROL
UNIT

OR
A/C ECU

NOTE

:VEHICLES WITHOUT A/C
:VEHICLES WITH A/C

ACA00892

Connectors: C-15, C-60, C-119, C-147 <LHD>

AB

C-119
C-147

C-15 (B)
C-60 (B)

ACA00896

AC

Connector: C-15 <RHD>

C-15 (B)

ACA00895AB

Connector: C-119 <RHD>

C-119

ACA00886

AH

Connectors: C-301, C-306 <LHD>
ETACS-ECU

C-301

C-306

DEFOGGER

CHASSIS ELECTRICAL

54A-511

COMMENTS ON TROUBLE SYMPTOM
If the rear window defogger does not work after
switching on (the defogger timer will be on for
approximately 20 minutes), the rear window defog-
ger relay circuit may be defective.
NOTE: When the engine is not running, the rear win-
dow defogger does not work.

PROBABLE CAUSES

• Malfunction of the rear window defogger relay

• Wiring harness or connector failure

• Malfunction of heater control panel <vehicles

without A/C> or A/C control panel <vehicles with
A/C>

• Malfunction of heater control unit <vehicles with-

out A/C> or A/C-ECU <vehicles with A/C>

• Malfunction of ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the CAN bus line (Refer to GROUP
54C

− Troubleshooting ).

STEP 2. Check that the inside air/outside air
recirculation can be switched.
Check that the inside air/outside air recirculation can
be switched normally.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Refer to GROUP 55A

− trouble symptom

chart .

STEP 3. M.U.T.-III diagnosis code
Check that the air conditioner has not set a diagnosis
code.

Q: Is the diagnosis code set?

YES :

Carry out the diagnosis code procedures.

(Refer to GROUP 55A-trouble shooting .)

NO :

Go to Step 4.

STEP 4. M.U.T.-III other system's diagnosis code
Check that the ETACS-ECU has not set a diagnosis
code.

Q: Is the diagnosis code set?

YES :

Carry out the diagnosis code procedures.

Refer to .

NO :

Go to Step 5.

STEP 5. M.U.T.-III data list
Check the rear window defogger switch signal by the
data list of the A/C-ECU <vehicles with A/C> or
heater control unit <vehicles without A/C>.

• Start the engine.

• Turn the rear window defogger switch from off to

on.

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Replace the heater control panel <vehicles
without A/C> or A/C control panel <vehicles
with A/C>.

ACA00887

AH

Connector: C-301, C-306 <RHD>
ETACS-ECU

C-301

C-306

AC612744 BE

Connectors: F-05, F-30 <LANCER>

F-05 (B)

F-30 (B)

AC801775 BH

F-05

F-30 (B)

Connectors: F-05, F-30
<LANCER SPORT BACK>

Item No.

Item name

Normal
condition

Item 60

Rear defogger
switch

OFF

→ ON

DEFOGGER

CHASSIS ELECTRICAL

54A-512

STEP 6. Connector check: C-306 rear window
defogger relay connector

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Repair the connector concerned.

STEP 7. Check the rear window defogger relay.
Refer to .

Q: Is the check result normal?

YES :

Go to Step 8.

NO :

Replace the defogger relay.

STEP 8. Connector check: F-30 rear window
defogger connector

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

Repair the connector concerned.

STEP 9. Measure the voltage at F-30 rear window
defogger connector.
(1) Disconnect the connector, and measure at the

wiring harness side.

(2) Ignition switch: ON
(3) Rear window defogger switch: ON (measure

within 20 seconds after the switch is turned on)

(4) Measure the voltage between terminal 1 and

body earth

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 10.

NO :

Go to Step 11.

STEP 10. Measure the resistance at F-05 rear
window defogger connector.
(1) Disconnect the connector, and measure at the

wiring harness side.

(2) Measure the resistance between terminal 1 and

body earth

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES :

Go to Step 19.

NO :

Repair the wiring harness wires between F-
05 rear window defogger connector terminal
No. 1 and body earth.

STEP 11. Measure the voltage at C-306 rear
window defogger relay connector.
(1) Remove the relay, and measure at the junction

block side.

(2) Measure the voltage between terminal 4 and

body earth

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 13.

NO :

Go to Step 12.

STEP 12. Check the wiring harness between C-
306 rear window defogger relay connector
terminal No. 4 and fusible link (37) <PETROL> or
(42) <DIESEL>.

• Check the power supply line for open circuit and

short circuit.

NOTE: Prior to the wiring harness inspection, check
intermediate connector C-129, and repair if neces-
sary.

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to GROUP

00

− How to Use Troubleshooting/

Inspection Service Points - How to Cope
with Intermittent Malfunction ).

NO :

Repair the wiring harness.

STEP 13. Measure the voltage at C-306 rear
window defogger relay connector.
(1) Remove the relay, and measure at the junction

block side.

(2) Ignition switch: ON
(3) Measure the voltage between terminal 2 and

body earth

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 14.

NO :

Go to Step 16.

STEP 14. Connector check: C-301 ETACS-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 15.

NO :

Repair the connector.

STEP 15. Check the wiring harness between C-
306 rear window defogger relay connector
terminal No. 1 and C-301 ETACS-ECU connector
terminal No. 12.

• Check the signal line for open circuit and short

circuit.

Q: Is the check result normal?

YES :

Go to Step 18.

NO :

Repair the wiring harness.

DEFOGGER

CHASSIS ELECTRICAL

54A-513

STEP 16. Connector check: C-147 heater control
panel connector <vehicles without A/C> or C-119
A/C control panel connector <vehicles with A/C>

Q: Is the check result normal?

YES :

Go to Step 17.

NO :

Repair the connector.

STEP 17. Check the wiring harness wires
between C-306 rear window defogger relay
connector terminal No. 2 and fusible link (34)
<PETROL> or (44) <DIESEL>.

• Check the input line for open or short circuit.

NOTE: Prior to the wiring harness inspection, check
joint connector C-150, and repair if necessary.

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to GROUP

00

− How to Use Troubleshooting/

Inspection Service Points - How to Cope
with Intermittent Malfunction ).

NO :

Repair the wiring harness.

STEP 18. Check the wiring harness wires
between C-306 rear window defogger relay
terminal No. 3 and F-30 rear window defogger
connector terminal No. 1.

• Check the input line for open circuit.

NOTE: Prior to the wiring harness inspection, check
intermediate connectors C-28 and D-17, and repair if
necessary.

Q: Is the check result normal?

YES :

Replace the ETACS-ECU.

NO :

Repair the wiring harness.

STEP 19. Connector check: C-60 heater control
unit connector <vehicles without A/C> or C-15 A/
C-ECU connector <vehicles with A/C>

Q: Is the check result normal?

YES :

Go to Step 20.

NO :

Repair the connector.

STEP 20. Check the wiring harness between C-
147 heater control panel connector <vehicles
without A/C> or C-119 A/C control panel
connector <vehicles with A/C> (terminals 9) and
C-60 heater control unit connector <vehicles
without A/C> or C-15 A/C-ECU connector
<vehicles with A/C> (terminals 9).

• Check the A/C control panel signal line and earth

line for open or short circuit.

Q: Is the check result normal?

YES :

Go to Step 21.

NO :

Repair the wiring harness.

STEP 21. Check the rear window defogger.
Check the rear window defogger (Refer to ).

Q: Is the check result normal?

YES :

Return to Step 1.

NO :

Replace the rear window glass.

REMOVAL AND INSTALLATION

M1540600200201

Refer to GROUP 55A

− Heater control unit .

ON-VEHICLE SERVICE

PRINTED HEATER CHECK

M1540500500421

1. Let the engine run (2,000 r/min), and check the

printed heater with the battery fully charged.

2. With the rear window defogger switch "ON," use

the circuit tester to measure the voltage of each
printed heater at the rear window glass centre A
point. If approximately 6 V is indicated, it is judged
good.

3. If the voltage of 12 V is indicated at the A point,

there is an open circuit between the A point and
negative terminal. Therefore, by moving the test
bar slowly to the negative side, search and
determine the location where the voltage changes
suddenly (0 V). The location of voltage change
indicates the open circuit position.

AC407247

Voltage (V)

Normal characteristics of print heater

Abnormal characteristics of print heater

Voltage (V)

AD

12

6

0

12

6

0

(+) terminal

(-) terminal

(+) terminal

(-) terminal

Length of print heater

Length of print heater

A (middle point)

Approximately 6 V

Disconnection
location