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.
2009 Acura CSX Base, StandardFACTORY OEM SERVICE PROCEDURE
Section 48 (Multiplex Integrated Control System)
WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.
- Component Location Index
- General Troubleshooting Information
- DTC Troubleshooting Index
- System Description
- Body Controller Area Network (B-CAN) and Fast Controller Area Network (F-CAN)
- Gateway Function
- Network "Loss of Communication" Error Checking Function
- Self-diagnostic Function (On-board diagnosis)
- Wake-up and Sleep Function
- Fail-safe Function
- Hardware Fail-safe Control
- Software Fail-safe Control
- Driver's MICU
- Power Supply Voltage Monitoring Function
- Entry Lights Control System (Ceiling Lights, Map Lights, Ignition Key Light)
- Collision Detection Signal (CDS)
- Key Interlock (A/T)
- Rear Window Defogger Timer Operation
- Combination Light Switch
- Daytime Running Lights
- Fog Lights
- Headlight Auto-OFF Function*
- Turn Signal/Hazard Warning Lights
- Courtesy Light (Driver's side)
- Wiper
- Driver's Power Window Relay
- Keyless Answer Back*
- Security Answer Back*
- Answer Back Response Operation
- Power Door Locks*
- Door Lock Response Operation
- Keyless Entry System*
- Keyless PANIC Operation
- Auto Power Door Locks (LOCK operation)*
- Auto Power Door Locks (UNLOCK operation)*
- Security Alarm System
- Passenger's MICU
- HDS Inputs, Outputs, and Commands
- Troubleshooting - B-CAN System Diagnosis Test Mode A
- Troubleshooting - B-CAN System Diagnosis Test Mode B
- Troubleshooting - B-CAN System Diagnosis Test Mode C
- Troubleshooting - B-CAN System Diagnosis Test Mode D
- Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS)
- Sleep and Wake-up Mode Test
- Circuit Diagram
- DTC Troubleshooting
- DTC B10A2- Driver's MICU Internal (EEPROM) Error
- DTC B11A2: Passenger's MICU Internal (EEPROM) Error
- DTC B1036: Driver's MICU IG1 Line Input Error
- DTC B11C7: Passenger's MICU IG1 Line Input Error
- DTC U0155: Driver's MICU Lost Communication with Gauge Control Module
- DTC U0155: Passenger's MICU Lost Communication with Gauge Control Module
- DTC U0199: Driver's MICU Lost Communication with Door Multiplex Control Unit
- DTC U1280: Communication bus Line Error (BUS-OFF)
- DTC U1282. Passenger's MICU Lost Communication with Driver's MICU
- DTC U1283: Driver's MICU Lost Communication with Passenger's MICU
- MICU Input Test
Factory Service Tools
Use the Manual With the Right Hardware
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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.