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.
Head-up Display System Schematic Circuit Diagram
2011 BMW 740LiSECTION Head-up Display System Schematic Circuit Diagram
HEAD-UP DISPLAY SYSTEM LEGENDS
| Index | Explanation |
|---|---|
| 1 | Central Gateway Module (ZGM) |
| 2 | Head-up display (HUD) |
| 3 | Central Information Display (CID) |
| 4 | Junction box (JB) |
| 5 | Front power distribution box |
| 6 | Controller |
| 7 | Car Information Computer (CIC) |
| 8 | Instrument cluster (KOMBI) |
| 9 | Driver assistance system control panel (BAFAS) |
| 10 | Footwell module (FRM) |
| K-CAN | Body controller area network |
| LIN-Bus | Local Interconnect Network bus |
HUD CONTROL UNIT K-ACN SIGNALS REFERENCE CHART
| In/out | Information | Source/sink | Function |
|---|---|---|---|
| In | Road speed | Instrument cluster | Display in the HUD |
| In | Check control message | Instrument cluster | Display in the HUD |
| In | Dimming/brightness | Rain and driving light sensor (RLS) via roof function Center (FZD) | Brightness adjustment |
| In | Height adjustment | CIC | Height adjustment |
| In | Brightness offset | CIC | Brightness adjustment |
| In | DCC | EHB3 (Adaptive Brake Assistant Warning) | Display in the HUD |
| In | Function selection | CIC | What is displayed in the HUD |
| In | On/Off switch | BAFAS | Switching the HUD On/Off |
| In | Navigation | CIC | Display in the HUD |
RENDER: 1.0x
NO RELATED
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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.