Mazda CX-9 Grand Touring. Manual - part 551

Fig. 9: Identifying Steering Lock Unit Terminals 
Courtesy of MAZDA MOTORS CORP. 

VOLTAGE SPECIFICATION 

Terminal

Signal name

Connected to

Measured 

condition

Voltage 

(V)

Inspection item(s)

C

Interior light 
power supply



BCM  



Ignition key 
illumination 

Under any 
condition

B+



Ignition key illumination 
bulb  



BCM (See BODY 
CONTROL MODULE 
(BCM) INSPECTION ) 



Related wiring harnesses 

D

Ignition key 
illumination 
control



BCM  



Ignition key 
illumination 

Ignition switch 
off and driver 
side door 
opened.

1.0 or 

less



Ignition key illumination 
bulb  



BCM (See BODY 
CONTROL MODULE 
(BCM) INSPECTION ) 



Related wiring harnesses 

15 s or more 
after all doors 
closed.

B+

E

Push switch 
signal

Keyless control 
module

Start knob 
pressed

B+



Keyless control module 
(See KEYLESS 
CONTROL MODULE 
INSPECTION 
[ADVANCED 
KEYLESS SYSTEM] ) 



Related wiring harnesses 

Start knob 
released

1.0 or 
less

F

Power supply

BCM

Under any 
condition

B+



BCM (See BODY 
CONTROL MODULE 
(BCM) INSPECTION ) 



Related wiring harnesses 

G

Key reminder 
switch signal

Keyless control 
module

Key inserted

B+



Keyless control module 
(See KEYLESS 
CONTROL MODULE 
INSPECTION 

1.0 or 

 

2008 Mazda CX-9 Grand Touring 

2008 ACCESSORIES & BODY, CAB Power Systems - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:41:28 AM

Page 5 

© 2005 Mitchell Repair Information Company, LLC. 

RELAY LOCATION 

Key removed

less

[ADVANCED 
KEYLESS SYSTEM] ) 



Related wiring harnesses 

I

Power supply

BCM

Under any 
condition

B+



BCM (See BODY 
CONTROL MODULE 
(BCM) INSPECTION ) 



Related wiring harnesses 

K

Serial 
communication

Keyless control 
module

Because this terminal is 

for communication, 

good/no good judgment 

by terminal voltage is not 

possible.



Keyless control module 
(See KEYLESS 
CONTROL MODULE 
INSPECTION 
[ADVANCED 
KEYLESS SYSTEM] ) 



Related wiring harnesses 

L

GND

Body ground

Under any 
condition

1.0 or 

less

Related wiring harnesses

 

2008 Mazda CX-9 Grand Touring 

2008 ACCESSORIES & BODY, CAB Power Systems - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:41:28 AM

Page 6 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 10: Identifying Relay Location 
Courtesy of MAZDA MOTORS CORP. 

RELAY INSPECTION 

RELAY TYPE 

RELAY TYPE REFERENCE 

Terminal type

Part name



Main relay No. 1  



Fuel pump relay  



Rear window defroster relay  

 

2008 Mazda CX-9 Grand Touring 

2008 ACCESSORIES & BODY, CAB Power Systems - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:41:28 AM

Page 7 

© 2005 Mitchell Repair Information Company, LLC. 

TYPE A 

1. Verify the continuity between the relay terminals. 



If not as indicated in the table, replace the relay. 

Fig. 11: Relay Terminals Continuity Chart (Type A) 
Courtesy of MAZDA MOTORS CORP. 

4 terminals

Type A



Starter relay  



Back-up light relay  



A/C relay  



TNS relay  



Horn relay  



Seat warmer relay RH  



H/L HI relay  



Main relay No.2  



H/L LOW relay  



Seat warmer relay LH  



Front fog light relay  

Type B



Front blower relay  



Rear blower relay  



Fan relay  



Cooling fan relay No.1  



Cooling fan relay No.2  

 

2008 Mazda CX-9 Grand Touring 

2008 ACCESSORIES & BODY, CAB Power Systems - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:41:28 AM

Page 8 

© 2005 Mitchell Repair Information Company, LLC.