Mazda CX-9 Grand Touring. Manual - part 461

TRIM REMOVAL/INSTALLATION .) 

4. Remove the bass-box. (BSM control module (LH) only) (Vehicles with Bose®) (See BASS-BOX 

REMOVAL/INSTALLATION .)  

5. Remove the BSM control module with the connector connected.  

6. Measure the BSM control module terminal voltage using the short wiring harness connector in the 

position shown in the figure. 

Fig. 17: Identifying Trunk End Trim & BSM Control Module Short Wiring Harness Connector 
Courtesy of MAZDA MOTORS CORP. 

TERMINAL VOLTAGE TABLE (REFERENCE) 

NOTE:



The BSM control module connector cannot be connected to a tester 
due to its water-resistance processing, therefore the short wiring 
harness connector is used for measuring the terminal voltage.  



If the terminal voltage is not as indicated in the table, inspect the 
short wiring harness connector for continuity. (See CONTINUITY 
INSPECTION OF SHORT WIRING HARNESS CONNECTOR.) If the 
short wiring harness connector is normal, inspect the parts under 
"Inspection items". 



If the system does not work properly even though the parts or 
related wiring harnesses do not have any malfunction, replace 
the BSM control module.  

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES Instrumentation/Driver Info - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:42:27 AM

Page 31 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 18: Identifying BSM Control Module Short Wiring Harness Connector Terminals 
Courtesy of MAZDA MOTORS CORP. 

VOLTAGE SPECIFICATION 

Terminal

Signal

Connected 

to

Measurement condition

Voltage (V)/ 

Continuity

Inspection item (s)

A

BCM GND

Body ground Under any condition

1.0 or less



Related 
wiring 
harnesses  

B

BSM 
indicator 
light signal

BSM 
indicator 
light

Ignition switch is in ON 
position and BSM indicator 
light is illuminated

B+



BSM 
indicator 
light  



Related 
wiring 
harnesses  

BSM indicator light is not 
illuminated

1.0 or less

C

-

-

-

-

-

D

(1)

BSM OFF 
switch signal

BSM OFF 
switch

Ignition 
switch at ON

BSM OFF 
switch is pressed

1.0 or less



BSM OFF 
switch  



Related 
wiring 
harnesses  

BSM OFF 
switch is not 
pressed

B+

D

(2)

-

-

-

-

-

E

-

-

-

-

-

F

CAN_L

-

Because this terminal is for communication, 
good/no good judgment by terminal voltage is 
not possible.



Related 
wiring 
harnesses  

G

Power 
supply

fuse

Ignition switch at ON

B+



fuse  



Related 
wiring 
harnesses  

Ignition switch off

1.0 or less

H

CAN_H

-

Because this terminal is for communication, 
good/no good judgment by terminal voltage is 
not possible.



Related 
wiring 
harnesses  

(1)

BSM control module (RH) only

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES Instrumentation/Driver Info - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:42:27 AM

Page 32 

© 2005 Mitchell Repair Information Company, LLC. 

CONTINUITY INSPECTION OF SHORT WIRING HARNESS CONNECTOR 

1. Verify that the continuity between the short wiring harness connector terminals is as indicated in the 

table. 



If the continuity is not as indicated in the table, replace the short wiring harness connector. 

(2)

BSM control module (LH) only

NOTE:



Terminal voltage of both the left and right BSM control modules is 
equivalent  

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES Instrumentation/Driver Info - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:42:27 AM

Page 33 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 19: BSM Control Module Short Connector Terminals Continuity Chart 
Courtesy of MAZDA MOTORS CORP. 

BLIND SPOT MONITORING (BSM) OFF SWITCH REMOVAL/INSTALLATION 

1. Disconnect the negative battery cable.  

2. Remove the dashboard under cover (LH). (See DASHBOARD UNDER COVER 

REMOVAL/INSTALLATION .)  

3. Remove the hood release lever. (See HOOD LATCH AND RELEASE LEVER 

 

2008 Mazda CX-9 Grand Touring 

2008 BODY & ACCESSORIES Instrumentation/Driver Info - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:42:27 AM

Page 34 

© 2005 Mitchell Repair Information Company, LLC.