Mitsubishi L200. Manual - part 852

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-24

STEP 16. Check the wiring harness between C-06 
blower switch connector terminal No.3 and C-201 
blower relay connector terminal No.3.

AC509611AW

Connector: C-06 <LHD>

Harness side

AC509932 BB

Harness side

Connector: C-06 <RHD>

AC509934 AU

Connectors: C-201, C-207 <LHD>

Junction block side

Junction block (Front view)

C-201

Harness side

C-207

C-201

C-207

AC509936 AQ

Connectors: C-201, C-207 <RHD>

Junction block side

Junction block (Front view)

C-201

Harness side

C-207

C-201

C-207

NOTE: Prior to the wiring harness inspection, check 
junction block connector C-207, and repair if neces-
sary.

• Check the blower relay output line for open cir-

cuit.

Q: Is the check result normal?

YES : 

Go to Step 17.

NO : 

Repair the wiring harness.

STEP 17. Check the wiring harness between C-28 
blower motor connector terminal No.1 and C-06 
blower switch connector terminal No.5.

AC509611AW

Connector: C-06 <LHD>

Harness side

AC509932 BB

Harness side

Connector: C-06 <RHD>

AC509613AS

Harness side

Connector: C-28 <LHD>

AC509930AR

Harness side

Connector: C-28 <RHD>

• Check the blower motor power supply line for 

open circuit.

Q: Is the check result normal?

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-25

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00, How to 
Cope with Intermittent Malfunction ).

NO : 

Repair the wiring harness.

STEP 18. Check the blower motor operation.
 Refer to 

P.55A-79

.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00, How to 
Cope with Intermittent Malfunction ).

NO : 

Replace the blower motor.

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-26

Inspection Procedure 3: The blower air volume cannot be changed

Blower Motor Circuit

BLOWER
SWITCH

A/C TEMPERATURE
CONTROL RESISTOR

BLOWER
MOTOR

FUSIBLE
LINK

IGNITION
SWITCH (IG2)

BLOWER
RELAY

20

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

Blower Motor Circuit

BLOWER
SWITCH

A/C TEMPERATURE
CONTROL RESISTOR

BLOWER
MOTOR

FUSIBLE
LINK

IGNITION
SWITCH (IG2)

BLOWER
RELAY

20

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

AC900880

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-27

COMMENTS ON TROUBLE SYMPTOM
If the blower air amount cannot be changed when the 
blower switch is operated, the blower switch may be 
defective.

PROBABLE CAUSES

• Malfunction of the A/C temperature control resis-

tor

• Damaged the wiring harness or connectors

• Malfunction of the blower switch

DIAGNOSIS PROCEDURE

STEP 1. Check that the blower motor operates 
when the blower switch is moved to the "4 (HI)" 
position.
(1) Turn the ignition switch to the "ON" position.
(2) Turn the blower switch to the "4 (HI) " position.

Q: Does the blower motor operate when the blower 

switch is moved to the "4 (HI)" position?
YES : 

Go to Step 2.

NO : 

Refer to Inspection procedure 2 "The blower 
does not work 

P.55A-17

."

STEP 2. Connector check: C-06 blower switch 
connector

AC509611AW

Connector: C-06 <LHD>

Harness side

AC509932 BB

Harness side

Connector: C-06 <RHD>

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the connector.

STEP 3. Check the blower switch continuity.
 Refer to 

P.55A-71

.

Q: Is the blower switch continuity in good condition?

YES : 

Go to Step 4.

NO : 

Replace the blower switch.

STEP 4. Connector check: C-23 A/C temperature 
control resistor connector

AC509611BE

Connector: C-23 <LHD>

Harness side

AC509932 BK

Harness side

Connector: C-23 <RHD>

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the connector.

STEP 5. Check the A/C temperature control 
resistor resistance value.
 Refer to 

P.55A-79

.

Q: Is the measured value at the standard value?

YES : 

Go to Step 6.

NO : 

Replace the A/C temperature control 
resistor.