Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSMAZDA2009CX-9 FWD V6-3.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSINFORMATION BUSTESTING AND INSPECTION
2009 Mazda CX-9 FWD V6-3.7L
Information Bus: Testing and Inspection
2009 Mazda CX-9 FWD V6-3.7LSECTION Testing and Inspection
MULTIPLEX COMMUNICATION SYSTEM [MULTIPLEX COMMUNICATION SYSTEM]
Outline
- If the controller area network (CAN) system is malfunctioning, read the DTCs of the following modules, using the M-MDS to determine the malfunctioning system.
HS-CAN
- PCM
- TCM
- DSC/RSC HU/CM
- BCM
- AWD control module
- PLG control module
- SAS control module
- Keyless control module
- Instrument cluster
- BSM control module (LH)
- BSM control module (RH)
MS-CAN
- Audio unit (Base module)
- Car-navigation unit
- Audio amplifier
- SIRIUS satellite radio unit
- RES unit
- Bluetooth unit
- Instrument cluster
- Information display
Flowchart (HS-CAN)
- Use the following flowchart to verify the cause of the trouble.
Step 1:
Step 2:
Step 3-Step 6:
Step 7:
Step 8-Step 12:
Step 13:
Step 14:
Flowchart (MS-CAN)
- Use the following flowchart to verify the cause of the trouble.
Step 1-Step 4:
Step 5-Step 6:
Step 7:
Step 8-Step 12:
Step 13:
Step 14:
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.