Mazda CX-9 Grand Touring. Manual - part 127

 

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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

  

Microsoft 

 

Sunday, November 15, 2009 9:41:34 AM

Page 7 

© 2005 Mitchell Repair Information Company, LLC. 

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

Page 8 

© 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. 

 

 

 

 

 

 

 

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