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.
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HOMESERVICE MANUALSMAZDA2009TRIBUTE 4WD L4-2.5LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSCAN COMMUNICATION NETWORKPINPOINT TEST 9: THE AUDIO CONTROL MODULE (ACM) DOES NOT RESPOND TO THE SCAN TOOL
2009 Mazda Tribute 4WD L4-2.5L
Pinpoint Test 9: The Audio Control Module (ACM) Does Not Respond To The Scan Tool
2009 Mazda Tribute 4WD L4-2.5LSECTION Pinpoint Test 9: The Audio Control Module (ACM) Does Not Respond To The Scan Tool
PINPOINT TEST 9: THE AUDIO CONTROL MODULE (ACM) DOES NOT RESPOND TO THE SCAN TOOL
Normal Operation
The audio control module (ACM) communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits (GY/O) (MS-CAN +) and (V/O) (MS-CAN -) provide the network connection to the ACM. The ACM shares the MS-CAN with the instrument cluster (IC), HVAC module, smart junction box (SJB), satellite digital audio receiver system (SDARS) module, front controls interface module (FCIM) and front display interface module (FDIM). Voltage for the ACM is provided by circuit (W/R). Ground is provided by circuit (B/GY).
Possible Causes
- Fuse
- Wiring, terminals or connectors
- Audio unit
Diagnostic Procedure
CAUTION:Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE:Failure to disconnect the battery when instructed will result in false resistance readings. See Battery Disconnect.
Step 1-Step 4:
RENDER: 1.0x
NO RELATED
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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.