Mazda 6. Manual - part 387

U–52

CONTROL SYSTEM 

FAN SWITCH INSPECTION

A6E854061050W01

1. Remove the climate control unit.
2. Inspect for continuity between the fan switch terminals using an ohmmeter.

• If not as specified, replace the fan switch.

End Of Sie

DEFROSTER SWITCH INSPECTION

A6E854061050W02

1. Remove the climate control unit.
2. Inspect for continuity between the defroster switch terminals using an ohmmeter.

• If not as specified, replace the climate control 

unit.

End Of Sie

A6E8540W036

A6E8540W056

A6E8540W037

A6E8540W057

ON-BOARD DIAGNOSTIC 

U–53

U

DIAGNOSTIC TROUBLE CODE NUMBER INSPECTION

A6E857001038W01

1. Remove the glove compartment.
2. Short the A/C check connector to the GND 

terminal using a jumper wire.

3. Shine a 60 W incandescent light from a height of 

approximately 100 mm {3.9 in} onto the solar 
radiation sensor.

Note

• When incandescent light does not shine on 

the solar radiation sensor, the climate control 
unit determines a malfunction and indicates 
a diagnostic trouble code “02”.

4. Turn the ignition switch to ON position.
5. Read DTCs from the flashing of the rear defroster 

indicator light on the climate control unit. Carry out DTC inspection. (present and past failure indication modes)

• When the system is normal, the rear defroster indicator light does not flash.

• If any of the diagnostic trouble codes are indicated, carry out troubleshooting according to the code.

6. After completion of repairs, erase all diagnostic trouble code(s) from memory. (See 

U–53 Erasing Past Failure 

Memory

.)

7. Remove the jumper wire.

Present Failure Indication Mode

• The on-board diagnostic function display the present failure indication mode directly after start up. In present 

failure indication mode, present failures in the control system circuits (open, short circuits) are detected, and 
the flashing of the rear defroster indicator light on the climate control unit indicates the DTCs.
— If a diagnostic trouble code is indicated, refer to the following diagnostic trouble code table and inspect the 

appropriate system.

Past Failure Indication Mode

• While in present failure indication mode, press the A/C switch to change to the past failure indication mode. In 

past failure indication mode, past failures (intermittent problems) in the input sensor circuits (open, short 
circuits) are shorted, and the flashing of the rear defroster indicator light on the climate control unit indicates the 
DTCs.
— If a diagnostic trouble code is indicated, refer to the following diagnostic trouble code table and inspect the 

appropriate system. (Disconnections and short circuits are memorized in the same system even if either 
occurs only once.)

— If the A/C switch is pressed again while in past failure indication mode, the on-board diagnostic function will 

return to present failure indication mode.

Erasing Past Failure Memory

• When DTCs are displayed in the past failure 

indication mode, they remain in the memory after 
the failed systems are corrected. Consequently, 
the next time the past failure indication mode is 
used, the same past failure DTCs will be indicated 
by the flashing of the rear defroster indicator light 
on the climate control unit. Therefore, erase the 
past failure memory after correcting all failed 
systems. To erase the past failure memory, press 
the AUTO switch and REC/FRESH switch on the 
climate control unit at the same time while in past 
failure indication mode. If erased, the rear 
defroster indicator light flashes once.

ON-BOARD DIAGNOSTIC

A6E8570W004

A6E8570W001

U–54

ON-BOARD DIAGNOSTIC 

DTC Table

No.

Indicator pattern

Diagnosed circuit

02

Solar radiation sensor (present)

06

Cabin temperature sensor (present)

07

Cabin temperature sensor (past)

10

Evaporator temperature sensor (present)

11

Evaporator temperature sensor (past)

12

Ambient temperature sensor (present)

13

Ambient temperature sensor (past)

14

Water temperature sensor (present)

15

Water temperature sensor (past)

18

Air mix actuator [potentiometer] (present)

19

Air mix actuator [potentiometer] (past)

21

Airflow mode actuator [potentiometer] (present)

22

Airflow mode actuator [potentiometer] (past)

58

Air mix actuator [motor lock] (past)

59

Airflow mode actuator [motor lock] (past)

ON-BOARD DIAGNOSTIC 

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U

Output Device Operation Check Mode
Inspection

1. Warm up the engine.
2. Turn the ignition switch to LOCK position.
3. Start up the on-board diagnostic function (present failure indication mode).
4. Press the AUTO switch.
5. Verify that all the indicator lights of the climate 

control unit and center panel (climate control part) 
illuminate for 4 seconds.

6. Verify the operation of the each output device 

when changing steps by pressing the REC/
FRESH switch, and referring to the output device 
operation check chart.

• If not as specified, inspect the malfunctioning 

system.

Note

• If the AUTO switch is pressed again, the on-

board diagnostic function will return to 
present failure indication mode.

7. Turn the ignition switch to LOCK position to end 

the on-board diagnostic function.

Output device operation check table

A6E8570W002

A6E8570W003

Step Operating device

Operating conditions

Moni 

tor

*

Other device conditions

1

Blower motor 
speed

1

• Air mix actuator operation

— 50%

• Airflow mode actuator operation

— VENT

• Air intake actuator operation

— FRESH

• A/C compressor operation

— ON

2

Air mix actuator 
operation

21.0

• Blower motor speed

— 3rd

• Airflow mode actuator operation

— VENT

• Air intake actuator operation

— FRESH

• A/C compressor operation

— ON

20.5

20.0