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.
Mark II Navigation System Diagnosis
The Nav computer does not communicate with the DIS/MoDiC.
Diagnosis of the Nav Computer is performed with conventional procedures and by utilizing the Status displays on the previous pages.
Refer to the DIS for RGB output signal oscilloscope displays for visual confirmation of signal integrity.
The Board monitor (BMBT) does however communicate with the DIS/MoDiC. Follow the fault symptom path of the DIS Diagnosis Program for detailed diagnostic procedures.
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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.