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.
Error message
Error messages appear on the Operating Electronics, Navigation Control Module J402 display.
Indicator in display:
| Connection to chip reader faulty. Routes are not saved. Please enter routes manually. Please confirm with RETURN. |
Error message is shown until RETURN button is pressed.
Malfunction cause:
CAN BUS (Infotainment) from Operating Electronics, Navigation Control Module J402 to Chip Card Reader R99 interrupted.
- Check CAN BUS connection → Electrical Wiring Diagrams, Troubleshooting and Component Locations.
Chip Card Reader R99 is faulty.
- Replace Chip Card Reader R99 → Chip Card Reader R99 , removing and installing .
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.