Mazda 6. Manual - part 329

T–76

WARNING AND INDICATOR SYSTEM 

Operating Order

A6E8118W009

WARNING AND INDICATOR SYSTEM 

T–77

T

Checking Order

Note

• When inspecting more than two DTCs, perform the inspection by following the priority order of inspection 

indicated in the chart below.

Inspection of Diagnostic Trouble Codes

Diagnostic procedure

Priority order 

of inspection

IG switch 

position

Check code

1

ON

22

2

01, 04, 08, 12, 13, 14, 16, 18, 23, 25, 26

3

LOCK

31

DTC 01

Buckle switch on/off signal

STEP

INSPECTION

INDICATION

ACTION

1

Unfasten driver-side seat belt. 
(Buckle switch on.)

Go to next step.

Measure voltage at instrument cluster terminal 2G.
Is voltage 0 V?

• If as specified, replace instrument cluster.

• If not as specified, inspect following parts.

— Buckle switch
— Wiring harness (Buckle switch—instrument 

cluster)

2

Fasten driver-side seat belt. (Buckle 
switch off.)

Measure voltage at instrument cluster terminal 2G.
Is voltage B+?

• If as specified, replace instrument cluster.

• If not as specified, inspect following parts.

— Buckle switch
— Wiring harness (Buckle switch—instrument 

cluster)

Input signal to instrument cluster is okay.

T–78

WARNING AND INDICATOR SYSTEM 

Diagnostic procedure

DTC 04

Door switch on/off signal

STEP

INSPECTION

INDICATION

ACTION

1

Open driver-side door. (Door switch 
on.)

Close driver-side door, then go to next step.

Measure voltage at instrument cluster terminal 1J.
Is voltage 0 V?

• If as specified, replace instrument cluster.

• If not as specified, inspect following parts.

— Door switch
— Wiring harness (Instrument cluster—door switch)

2

Open passenger-side door. (Door 
switch on.)

Close passenger-side door, then go to next step.

Measure voltage at instrument cluster terminal 1I.
Is voltage 0 V?

• If as specified, replace instrument cluster.

• If not as specified, inspect following parts.

— Door switch
— Wiring harness (Instrument cluster—door switch)

3

Open rear door on driver’s side. 
(Door switch on.)

Close rear door on driver’s side, then go to next step.

Measure voltage at instrument cluster terminal 1I.
Is voltage 0 V?

• If as specified, replace instrument cluster.

• If not as specified, inspect following parts.

— Door switch
— Wiring harness (Instrument cluster—door switch)

4

Open rear door on passenger’s 
side. (Door switch on.)

Close rear door on passenger’s side, then go to next 
step.

Measure voltage at instrument cluster terminal 1I.
Is voltage 0 V?

• If as specified, replace instrument cluster.

• If not as specified, inspect following parts.

— Door switch
— Wiring harness (Instrument cluster—door switch)

WARNING AND INDICATOR SYSTEM 

T–79

T

Diagnostic procedure

5

Close all doors. (Door switch off.)

Measure voltage at instrument cluster terminals 1I and 
1J.
Is voltage B+?

• If as specified, replace instrument cluster.

• If not as specified, inspect following parts.

— Door switch
— Wiring harness (Instrument cluster—door switch)

Input signals to instrument cluster are okay.

DTC 08

TNS relay on/off signal

STEP

INSPECTION

INDICATION

ACTION

1

Turn headlight switch to TNS 
position. (TNS relay on.)

Go to next step.

Measure voltage at instrument cluster terminal 2K.
Is voltage B+?

• If as specified, replace instrument cluster.

• If not as specified, inspect following parts.

— TNS relay
— Wiring harness (Battery—TNS relay—instrument 

cluster)

2

Turn headlight switch off. (TNS relay 
off.)

Measure voltage at instrument cluster terminal 2K.
Is voltage 0 V?

• If as specified, replace instrument cluster.

• If not as specified, inspect following parts.

— TNS relay
— Wiring harness (TNS relay—instrument cluster)

Input signal to instrument cluster is okay.

DTC 12

Operation signal to speedometer

INSPECTION

INDICATION

SITUATION

ACTION

Wait for 2 seconds after selecting DTC 12.

Speedometer needle 
moves full scale then 
returns to 60 km/h or 60 
MPH.

Speedometer is okay.

Other than stated above.

Replace instrument 
cluster.

—

STEP

INSPECTION

INDICATION

ACTION