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 MANUALSACURA2003MDX TOURINGREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTINFOTAINMENTONSTAR SYSTEM
2003 Acura MDX Touring
ONSTAR System
2003 Acura MDX TouringSECTION ONSTAR System
- Component Location Index
- System Description
- Basic Operation
- OnStar Panel Buttons And Lights
- Stolen Vehicle Tracking
- Virtual Advisor
- Cellular Phone
- Remote Operation
- OnStar Power Modes
- Registering A Replacement OnStar Unit
- Self-Diagnostic Function
- How to Enter the Diagnosis Mode (From Normal Operation Mode)
- How to Display The DTC
- How to Delete the DTC
- How To Exit The Self-Diagnostic Function
- Output Mode
- Circuit Diagram
- Symptom Troubleshooting Index
- Symptom Troubleshooting
- OnStar Buttons Respond Normally When Pressed, But The OnStar LED Indicator Is Solid Or Flashing Red
- OnStar Buttons Do Not Respond When Pressed And OnStar LED Indicator Is Solid Or Flashing Red Or Is Solid Green
- OnStar System States It Is Dialing Out After OnStar Services Button Is Pressed, But Only A Beeping Or Carrier Error Message Is Heard
- DTC Codes
- DTC Troubleshooting
- DTC 1-1: OnStar Control Unit Internal Error (DSP Communicate Error, CPU Or DSP Memory Error)
- DTC 1-2: OnStar Control Unit Internal Error (EEPROM error)
- DTC 1-3: GPS Receiver Error
- DTC 1-4: Telephone Module Error
- DTC 2-1: OnStar Control Unit Lost Communication With SRS Unit (Collision Detection Signal Error)
- DTC 2-3: GPS Antenna Circuit Malfunction
- DTC 2-4: Cellular Phone Antenna Circuit Malfunction
- DTC 2-5: OnStar Switches (Four Buttons) Circuit Malfunction
- DTC 2-6: Microphone Circuit Malfunction
- OnStar Control Unit Input Test
- OnStar Button Test
- LED Indicator Test
- Control Unit Removal/Installation
- Transitioning the OnStar Control Unit to Market Mode
- Control Unit Replacement
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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.