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 MANUALSACURA2008RDXREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 249 (MODULE COMMUNICATIONS NETWORK SYSTEM)DIAGNOSIS AND TESTINGCOMMUNICATIONS NETWORKSYMPTOM CHART

2008 Acura RDX

Symptom Chart

2008 Acura RDXSECTION Symptom Chart

WARNING: This page is about a different car, the 2005 Mercury Sable and 2005 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
The anti-lock brake system (ABS) module does not respond to the diagnostic tool	Wire or connection in the high speed controller area network (CAN) ABS module	GO to PINPOINT TEST A .
The electronic automatic temperature control (EATC) module does not respond to the diagnostic tool	Wire or connection in the medium speed controller area network (CAN) EATC module	GO to PINPOINT TEST B .
The smart junction box (SJB) does not respond to the diagnostic tool	Wire or connection in the medium speed controller area network (CAN) SJB	GO to PINPOINT TEST C .
The restraint control module (RCM) does not respond to the diagnostic tool	Wire or connection in the international standards organization (ISO) 9141 communication network RCM	GO to PINPOINT TEST H .
The powertrain control module (PCM) does not respond to the diagnostic tool	Wire or connection in the high speed controller area network (CAN) PCM	GO to PINPOINT TEST D .
The instrument cluster does not respond to the diagnostic tool	Wire or connection in the high speed controller area network (CAN) Wire or connection in the medium speed CAN Instrument cluster.	GO to PINPOINT TEST E .
No medium speed controller area network (CAN) communication	Wire or connection in the medium speed CAN Electronic automatic temperature control (EATC) module Smart junction box (SJB) Instrument cluster	GO to PINPOINT TEST F .
No high speed controller area network (CAN) communication	Wire or connection in the high speed CAN Powertrain control module (PCM) Anti-lock brake system (ABS) module Instrument cluster	GO to PINPOINT TEST G .
No international standards organization (ISO) 9141 network communication	Wire or connection in the ISO 9141 network circuit Restraint control module (RCM)	GO to PINPOINT TEST H .
No module/network communication - no power to the diagnostic tool	Data link connector (DLC) C251 Smart junction box (SJB) fuse 38 (15A) Circuitry Diagnostic tool	GO to PINPOINT TEST I .

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.