Mazda CX-9 Grand Touring. Manual — part 127

Fig. 5: Symptom Troubleshooting Chart
Courtesy of MAZDA MOTORS CORP.

NO.1 ANY OF THE FOLLOWING LIGHTS DO NOT ILLUMINATE WHEN
IGNITION SWITCH TURNED TO ON POSITION: (ABS WARNING LIGHT,
BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR LIGHT AND/OR TCS
OFF LIGHT) [DSC/RSC]

TROUBLESHOOTING CHART

DIAGNOSTIC PROCEDURE

DIAGNOSTIC PROCEDURE

1

Any of the following lights do not illuminate when the ignition switch is turned to the ON
position: (ABS warning light, BRAKE system warning light, DSC indicator light and/or TCS
OFF light).

[TROUBLESHOOTING HINTS]



Inspect each light in the instrument cluster for malfunction



Poor connection at DSC/RSC HU/CM connector

STEP

INSPECTION

ACTION

1

INSPECT FOR DTCS IN DSC/RSC
HU/CM



Inspect the DTC for the ON-BOARD
DIAGNOSTIC SYSTEM.



Have DTCs been stored in memory?

Yes

Perform the applicable DTC inspection. (See
ON-BOARD DIAGNOSIS [DSC/RSC] .)

No

Go to the next step.

2

INSPECT WHETHER MALFUNCTION
IS IN INSTRUMENT CLUSTER
SYSTEM OR OTHER SYSTEM



Do other warning and indicator lights
illuminate when the ignition switch is
turned to the ON position?

Yes Go to the next step.

No

Inspect or repair the instrument cluster (power

supply system, ground system).

2008 Mazda CX-9 Grand Touring

2008 BRAKES Symptom Troubleshooting (DSC/RSC) - Mazda CX-9

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Sunday, November 15, 2009 9:41:34 AM

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NO.2 ANY OF THE FOLLOWING LIGHTS REMAIN ON: (ABS WARNING
LIGHT, BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR LIGHT AND/OR
TCS OFF LIGHT) [DSC/RSC]

TROUBLESHOOTING CHART

3

VERIFY THAT DSC/RSC HU/CM
CONNECTOR IS CONNECTED



Is the DSC/RSC HU/CM securely
connected?

Yes Go to the next step.

No

Connect the DSC/RSC HU/CM connector

securely, then go to the next step.

4

VERIFY THAT DSC/RSC HU/CM
CONNECTOR TERMINAL OR
RELATED CONNECTOR TERMINALS
ARE CONNECTED



Are DSC/RSC HU/CM connector
terminal, instrument cluster connector
terminal, or related connector terminals
securely connected?

Yes Go to the next step.

No

Securely connect the DSC/RSC HU/CM

connector terminal and related connector

terminals.

5

INSPECT INSTRUMENT CLUSTER



Inspect the instrument cluster. (See
ON-BOARD DIAGNOSIS
[DSC/RSC] .)



If the instrument cluster normal

Yes

Replace the DSC/RSC HU/CM. (see DSC/RSC
HU/CM REMOVAL/INSTALLATION .)

No

Replace the instrument cluster. (See

INSTRUMENT CLUSTER

REMOVAL/INSTALLATION .)

2

Any of the following lights remain on: (ABS warning light, BRAKE system warning light, DSC
indicator light and/or TCS OFF light)

[TROUBLESHOOTING HINTS]



Brake fluid amount is low



Parking brake does not release



No connection at DSC/RSC HU/CM connector

(When HU/CM connector is disconnected, ABS warning light and BRAKE system warning light
illuminate)



DSC/RSC HU/CM detected malfunction (Input and output device malfunction)



DSC/RSC HU/CM detects low voltage in power supply



DSC/RSC HU/CM ground malfunction

(When DSC/RSC HU/CM ground is not securely connected, ABS warning light and BRAKE
system warning light illuminate but diagnostic trouble code does not displayed)

2008 Mazda CX-9 Grand Touring

2008 BRAKES Symptom Troubleshooting (DSC/RSC) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 9:41:34 AM

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© 2005 Mitchell Repair Information Company, LLC.

DIAGNOSTIC PROCEDURE

DIAGNOSTIC PROCEDURE



DSC/RSC HU/CM does not operate (DSC/RSC HU/CM malfunction)

STEP

INSPECTION

ACTION

1

INSPECT BRAKE FLUID AMOUNT AND
VERIFY THAT PARKING BRAKE
RELEASES



Is the brake fluid amount normal?



Is the parking brake pedal released?

Yes Go to the next step.

No

Add brake fluid or release parking brake

pedal.

2

INSPECT DTCS IN INSTRUMENT
CLUSTER



Inspect the DTC for the instrument
cluster ON-BOARD DIAGNOSTIC
SYSTEM.



Has DTC U2064 been recorded in
memory?

Yes Go to the next step.

No

Inspect the instrument cluster. (See

INSTRUMENT CLUSTER

INSPECTION .)

3

INSPECT DTCS IN DSC/RSC HU/CM



Inspect the DTC for the ON-BOARD
DIAGNOSTIC SYSTEM.



Have DTCs been stored in memory?

Yes

Perform inspection using appropriate DTC.
(See ON-BOARD DIAGNOSIS
[DSC/RSC] .)

No

Go to the next step.

4

INSPECT WHETHER MALFUNCTION
IS IN CONTROL MODULE
CONNECTOR, TERMINAL OR OTHER



Do the ABS warning light and BRAKE
system warning light go out after 4 s
when the ignition switch is turned to the
ON position?

Yes

Temporary poor connection in control module
connector.
Inspect DSC/RSC HU/CM connector, then go
to Step 7.
Inspect DSC/RSC HU/CM connector terminal,
then go to Step 8.

No

Go to the next step.

5

INSPECT BATTERY



Is the battery voltage normal?

Yes Go to the next step.

No

Inspect the battery and charging system.

(See BATTERY INSPECTION [MZI-3.7] .)

(See GENERATOR INSPECTION [MZI-

3.7] .)

6

INSPECT CHARGING SYSTEM



Is the battery voltage normal with
electrical load (A/C, headlight, etc.) on
and engine idling?

Yes Go to the next step.

No

Inspect the charging system (drive belt

tension, generator, etc.).

(See GENERATOR INSPECTION [MZI-

3.7] .)

VERIFY THAT DSC/RSC HU/CM

Yes Go to the next step.

2008 Mazda CX-9 Grand Touring

2008 BRAKES Symptom Troubleshooting (DSC/RSC) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 9:41:34 AM

Page 9

© 2005 Mitchell Repair Information Company, LLC.

NO.3 THERE IS A MALFUNCTION IN THE SYSTEM EVEN THOUGH ABS
WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR
LIGHT AND TCS OFF LIGHT DO NOT ILLUMINATE [DSC/RSC]

TROUBLESHOOTING CHART

DIAGNOSTIC PROCEDURE

DIAGNOSTIC PROCEDURE

NO.4 ABS OR TCS OPERATES FREQUENTLY/TCS DOES NOT WORK
CORRECTLY [DSC/RSC]

TROUBLESHOOTING CHART

7

CONNECTOR IS CONNECTED



Is the DSC/RSC HU/CM securely
connected?

No

Connect the DSC/RSC HU/CM connector

securely, then go to the next step.

8

VERIFY THAT DSC/RSC HU/CM
CONNECTOR TERMINAL OR
RELATED CONNECTOR TERMINALS
ARE CONNECTED



Are the DSC/RSC HU/CM connector
terminal or instrument cluster connector
terminal etc. related connector terminals
securely connected?

Yes

Replace the DSC/RSC HU/CM. (See
DSC/RSC HU/CM
REMOVAL/INSTALLATION .)

No

Securely connect the DSC/RSC HU/CM

connector terminal and related connector

terminals.

3

There is a malfunction in the system even though the ABS warning light, BRAKE system warning
light, DSC indicator light and TCS OFF light do not illuminate.

[TROUBLESHOOTING HINTS]



There is a mechanical malfunction in system

STEP

INSPECTION

ACTION

1

INSPECT DSC/RSC HU/CM FOR DTCs



Inspect the DTC for the ON-BOARD DIAGNOSTIC
SYSTEM.



Have DTCs been stored in memory?

Yes

Perform the applicable DTC
inspection.
(See ON-BOARD DIAGNOSIS
[DSC/RSC] .)

No

Go to the next step.

2

INSPECT DSC/RSC SYSTEM



Perform DSC/RSC system inspection. (See
DSC/RSC SYSTEM INSPECTION .)



Is the system normal?

Yes

Inspect the conventional brake
system.

No

Repair or replace any

malfunctioning part.

2008 Mazda CX-9 Grand Touring

2008 BRAKES Symptom Troubleshooting (DSC/RSC) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 9:41:34 AM

Page 10

© 2005 Mitchell Repair Information Company, LLC.