Mitsubishi Outlander XL. Manual - part 1199

INSPECTION PROCEDURE 9: Rear window defogger does not operate.

M15502000918USA0000010000

Rear Window Defogger Circuit

REAR
WINDOW
DEFOGGER
RELAY

RELAY BOX

REAR WINDOW
DEFOGGER

FUSIBLE
LINK

37

ETACS-ECU

REAR
WINDOW
DEFOGGER
SWITCH

INTERFACE
CIRCUIT

POWER
SOURCE

CPU

A/C-
CONTROL
PANEL

PASSENGER
COMPARTMENT

ZC6008750012

C-35

Connector: C-32, C-35

C-32

ZC6008780031

Connectors: C-301, C-306

C-306

C-301

AIR CONDITIONING

55A-87

MANUAL A/C DIAGNOSIS

ZC6008760041

Connector: C-119

ZC6008800010

Connector: D-12

ZC6008820010

Connectors: F-05, F-20

F-05 (B)

F-20 (B)

TECHNICAL DESCRIPTION (COMMENT)
If  the  defogger  does  not  operate  when  the  rear
window defogger switch is turned on, the rear window
defogger relay system may be defective.

TROUBLESHOOTING HINTS

｠

Malfunction of the A/C-ECU

｠

Malfunction of the rear window defogger relay

｠

Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:

｠

MB991223: Harness Set

｠

MB992006: Extra Fine Probe

STEP 1. Check the A/C and outside/inside air selection
damper control motor operation.

Q:Do  the  A/C  and  outside/inside  air  selection  damper

control motor work normally?

YES:

 Go to Step 2.

NO:

 Refer to Inspection procedure 2, "Malfunction of the

A/C-ECU power supply system P.55A-63."

STEP 2. Check rear window defogger relay connector C-306
for loose, corroded or damaged terminals, or terminals
pushed back in the connector.

Q:Is rear window defogger relay connector C-306 in good

condition?

YES:

 Go to Step 3.

NO:

 Repair or replace the connector. Refer to GROUP 00E,

Harness Connector Inspection P.00E-2. The rear window
defogger system should work normally.

55A-88

AIR CONDITIONING

MANUAL A/C DIAGNOSIS

STEP 3. Check the rear window defogger relay continuity.

2

3

4

1

ZC6030450000

   

ETACS-ECU

Follow the table below to check the rear window defogger relay
for continuity.

Battery voltage

Connect tester

between

Specified

condition

Not applied

3 - 4

Open Circuit

｠

Connect  terminal  1
to

 the

 positive

battery terminal

｠

Connect  terminal  2
to

 the

 negative

battery terminal

3 - 4

Less than 2 ohms

Q:Is the rear window defogger relay in good condition?

YES:

 Go to Step 4.

NO:

 Replace the rear window defogger relay. The rear

window defogger system should work normally.

STEP 4. Check rear window defogger connector F-20 and A/
C control panrl connector C-119 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.

Q:Are rear window defogger connector F-20 and A/C control

panrl connector C-119 in good condition?

YES:

 Go to Step 5.

NO:

 Repair or replace the connector. Refer to GROUP 00E,

Harness Connector Inspection P.00E-2. The rear window
defogger system should work normally.

AIR CONDITIONING

55A-89

MANUAL A/C DIAGNOSIS

STEP 5. Measure the voltage at rear window defogger
connector F-20.

(1)

Disconnect  rear  window  defogger  connector  F-20,  and
measure the voltage at the harness side.

(2)

Disconnect A/C-ECU connector C-119 and ground harness
side terminal No.6.

(3)

Turn the ignition switch to the "ON" position.

ZC6022230016

Harness side: F-20

(4)

Measure  the  voltage  between  rear  window  defogger
connector F-20 terminal No.1 and ground.

｠

The  measured  value  should  be  approximately  12  volts
(battery positive voltage).

Q:Is the measured voltage approximately 12 volts?

YES:

 Go to Step 13.

NO:

 Go to Step 6.

STEP 6. Measure the voltage at rear window defogger relay
connector C-306.

(1)

Disconnect  rear  window  defogger  relay  connector  C-306,
and measure the voltage at the junction block side.

ZC6022230018

Harness side: C-306

(2)

Measure the voltage between terminal 4 and ground.

｠

The  measured  value  should  be  approximately  12  volts
(battery positive voltage).

Q:Is the measured voltage approximately 12 volts?

YES:

 Go to Step 8.

NO:

 Go to Step 7.

STEP 7. Check the wiring harness between rear window
defogger relay connector C-306 (terminal 4) and the fusible
link (37).

NOTE: 

Also check intermediate connector C-35 for loose,

corroded, or damaged terminals, or terminals pushed back in
the connector. If intermediate connector C-35 is damaged,
repair or replace the connector as described in GROUP 00E,
Harness Connector Inspection P.00E-2.

Q:Is the wiring harness between rear window defogger relay

connector  C-306(terminal  4)  and  the  fusible  link  (37)  in

good condition?

YES:

 Check that the rear window defogger system works

normally.

NO:

 Repair the wiring harness. Check that the rear window

defogger system works normally.

STEP 8. Measure the voltage at rear window defogger relay
connector C-306.

(1)

Disconnect  rear  window  defogger  relay  connector  C-306,
and measure the voltage at the junction block side.

55A-90

AIR CONDITIONING

MANUAL A/C DIAGNOSIS