Acura Network Map
Acura began CAN deployment around 2004-2005 (model-dependent), following Honda's implementation. The architecture is a dual-bus system: a 500 kb/s high-speed CAN for powertrain and chassis systems accessible via DLC pins 6 and 14, and a separate body/comfort CAN accessible only through a gateway. Gateway location varies by model and year. Security gateway (SGW) restrictions appear on later models, requiring Honda HDS or a compatible J2534 pass-thru for many reprogramming procedures. Acura shares Honda's underlying network architecture, modules, and failure modes.
Testing values and scope patterns are universal — they live on the main CAN playbook. This page is what's specific to Acura: the buses, where the terminators live, and what breaks. Tap any era to explore it — network map, testing guide, failure patterns.
2004-2012
Not all 2004-2005 models adopted CAN immediately; rollout was gradual. Some models retained legacy K-Line/ISO 9141 or single-wire networks for certain modules during early years.
| Bus | Speed | Carries | DLC access | Terminators live in |
|---|
| High-speed CAN (powertrain/chassis) | 500 kb/s | Powertrain (PCM/ECM, TCM), ABS/VSA, SRS, gauge cluster | DLC pins 6/14 | not independently confirmed |
| Body/comfort CAN | — | Body control, HVAC, audio, navigation, door modules, convenience features | via gateway only | not independently confirmed |
GatewayVaries by model/year (no single defensible gateway identity)
Explore this era ⤢2013-2016
Increasing integration of driver-assist (AcuraWatch) systems onto the network.
| Bus | Speed | Carries | DLC access | Terminators live in |
|---|
| High-speed CAN (powertrain/chassis) | 500 kb/s | Powertrain, ABS/VSA, EPS, SRS, gauge cluster | DLC pins 6/14 | not independently confirmed |
| Body/comfort CAN | — | Body control, infotainment, HVAC, convenience systems | via gateway only | not independently confirmed |
GatewayVaries by model (integrated gateway function)
Explore this era ⤢2017-present
Security gateway restrictions require HDS or compatible J2534 pass-thru for most reprogramming and some module procedures. AcuraWatch driver-assist systems integrated onto the network.
| Bus | Speed | Carries | DLC access | Terminators live in |
|---|
| High-speed CAN (powertrain/chassis) | 500 kb/s | Powertrain, ABS/VSA, EPS, SRS, instrument cluster, radar/camera systems (AcuraWatch) | DLC pins 6/14 | not independently confirmed |
| Body/comfort CAN | — | Body control, infotainment, comfort/convenience systems | via gateway only | not independently confirmed |
GatewayVaries by model (no single defensible gateway identity)
Explore this era ⤢What breaks on Acuras
Aftermarket remote start/audio CAN tap damage
Improper taps or high-resistance splices into the CAN network (commonly at the DLC or behind the gauge cluster) for aftermarket remote start or audio systems cause intermittent network faults, U-codes, no-start conditions, and loss of body-control functions. Common on TL, MDX, and RDX models.
Water intrusion corroding CAN connections
Water migration (from firewall pass-throughs, sunroof drains, or windshield cowl) can corrode CAN bus connections and pins, causing high-speed CAN failure. Most common on MDX and RDX models. Check connector terminals for corrosion at CAN High/Low pins.
Gauge cluster CAN transceiver failure
Instrument cluster internal CAN transceiver failure causes intermittent high-speed CAN communication loss, multiple U-codes, and gauge dropout. Verify by disconnecting the cluster and checking whether other modules communicate.
The bench — what to test with
Quality DVOM with manual 200-ohm range$40-120; a cheap manual-range meter genuinely does the resistance/voltage job here as long as it holds a stable 200-ohm reading.
Terminator resistance, 2.5 V bias, and split-half short-finding catch the majority of CAN faults — opens, shorts, missing terminators, corrosion — with no scope needed.
2-channel automotive oscilloscope$150-600 for a capable 2-channel automotive scope; higher-end handhelds add better decode but two channels are enough for CAN-H/CAN-L.
The only tool that shows edge quality, corrupted frames, a babbling transceiver, reflections from a missing terminator or aftermarket tap, and amplitude loss from corrosion — things a DVOM's averaged reading hides.
Fine backprobe pin / T-pin set$15-40.
Reads CAN-H/CAN-L at module connectors without piercing insulation or spreading terminals (spread pins become tomorrow's intermittent) — essential for the gateway-hidden body bus and split-half work.
OBD-II breakout box or DLC breakout harness$30-200.
Clean, repeatable access to pins 6/14 (and grounds 4/5) without cramming probes into the connector, and lets you scope while the tool is still connected.
Honda HDS/i-HDS or a compatible authenticated J2534 pass-thruJ2534 pass-thru hardware $150-1500 plus Honda software/subscription; genuine dealer-level authentication is separate.
Required for full body-system access through the gateway and for reprogramming/protected writes on SGW-equipped 2017+ models; generic OBD-II won't reach many body modules on any CAN-era Acura.
Scan-tool access
Pre-2004 Acuras use ISO 9141-2 (K-Line) on the DLC. CAN models (2004+) require a Honda/Acura-capable scan tool for full system access; many body systems are not accessible via generic OBD-II. Security gateway on later models blocks most reprogramming without Honda HDS and a J2534 pass-thru; some procedures require dealer-level authentication. Restrictions are generally less stringent than domestic OEMs.