NO PLATE · Mercedes E53 · Blue

**تحويل الطلب:** الشكوى الواردة "حادث" فقط — لا تفاصيل عن نقطة الاصطدام، السرعة، انتشار الوسائد الهوائية، أو هل السيارة قابلة للقيادة. سأنتج بروتوكول تشخيص عام لما بعد الحادث لسيارة Mercedes E53 (نظام EQBoost 48V هجين خفيف)، مع توصية صريحة بجمع تفاصيل إضافية من الزبون/مستشار الخدمة أثناء التنفيذ.

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## 1) SYMPTOM SUMMARY
The vehicle was involved in an accident ("حادث") per the customer, with no further detail provided — no stated impact location, speed, airbag deployment status, or drivability issue. Given the E53's AMG chassis, 48V EQBoost mild-hybrid system, SRS package, and ADAS sensor suite (radar/camera), post-collision diagnostics must start with a full-vehicle assessment rather than assuming a single fault area. The service advisor should obtain more detail (impact direction, speed, drivable to shop, airbags deployed) before/while the technician proceeds.
**ملخص عربي:** الشكوى "حادث" فقط بدون تفاصيل — يجب البدء بفحص شامل لكل الأنظمة قبل افتراض أي عطل محدد.

## 2) LIKELY CAUSES (ranked)
1. **Structural/suspension misalignment** — any collision can shift subframe/suspension geometry even without visible panel damage.
2. **SRS/airbag system fault or deployment** — crash sensors (front/side) can trigger SRS DTCs or pyrotechnic deployment even in low-speed impacts.
3. **ADAS radar/camera misalignment** — front radar (behind grille) and windshield camera are commonly displaced or decalibrated in collisions, affecting Distronic/lane-assist/collision-prevention.
4. **Cooling system / AC condenser damage** — these sit in the front crash structure and are frequently punctured or bent in frontal impacts.
5. **48V EQBoost wiring/BSG fault** — belt-starter-generator wiring and 48V battery are routed near the front of the engine bay, vulnerable to impact damage.
6. **Hidden wiring harness damage** — pinched/stretched harnesses from body deformation can cause intermittent faults not visible on inspection.

**ملخص عربي:** الاحتمالات مرتبة من هيكل/تعليق، وسائد هوائية، حساسات ADAS، تبريد، نظام 48V، إلى تلف أسلاك خفي.

## 3) TEST SEQUENCE (cheapest first)
1. **Visual walk-around inspection** (free) — check panel gaps, paint transfer, fluid leaks (coolant/oil/AC), tire/wheel condition, airbag deployment indicators (dash cover, steering wheel hub, seat sides), broken lights/sensor housings. Expected: identify impact zone and visible severity. → If SRS deployed or visible severe damage → stop, escalate to body/structural assessment before any electrical work. If no visible damage → continue full scan regardless (impact still occurred).
2. **Get accident details from service advisor/customer** (free) — impact direction, approximate speed, was airbag light on before, was vehicle driven after impact. → Informs which modules to prioritize.
3. **Under-hood visual + fluid check** (free) — coolant/AC lines, 48V battery box, BSG wiring, front crossmember. → If leak or visible wire damage found → note before scanning, do not power up damaged circuits.
4. **Autel MaxiSys Ultra S2 — Auto Scan (full topology)** — read all modules/DTCs with freeze frame data. Expected: identifies which systems (SRS, ADAS, powertrain, chassis, 48V/EQBoost) set faults. → If SRS DTCs present → go to step 5. If ADAS DTCs present → go to step 6. If no DTCs → go to step 7 as precaution.
5. **SRS module — live data / crash data review** (Autel: SRS system → live data, check crash record if module supports it) — Expected: deployment status, pretensioner status. → If airbags/pretensioners deployed or crash record confirms activation → mandatory OEM-spec component replacement (get exact part/procedure from TOPIx/ALLDATA for this VIN); do NOT clear codes until documented and parts ordered per OEM.
6. **ADAS calibration status check** (Autel: ADAS module → radar/camera calibration status, or active test if available) — Expected: calibration valid/invalid flag. → If invalid or DTC present → static/dynamic calibration required after any mechanical correction (step 7).
7. **Wheel alignment measurement** (camber/caster/toe on alignment rack) — Expected: values within spec — get exact spec from TOPIx/ALLDATA for this VIN. → If out of spec → refer to body/frame shop for structural correction before final ADAS calibration.
8. **Coolant system pressure test** (if front impact suspected or leak found in step 3) — Expected: holds pressure per spec (get spec from TOPIx/ALLDATA). → If it doesn't hold → inspect condenser/radiator/hoses for puncture from impact debris.
9. **48V EQBoost system check** (Autel: live data PIDs for 48V battery voltage, BSG status, active test if supported) — Expected: voltage/status within spec (get spec from TOPIx/ALLDATA). → If fault → trace wiring in impact zone before condemning BSG/battery.

**ملخص عربي:** التسلسل يبدأ بفحص بصري مجاني، ثم فحص كمبيوتر شامل بالأوتيل، ثم فحوصات مستهدفة (وسائد، ADAS، محاذاة، تبريد، نظام 48V) حسب النتائج.

## 4) DATA TO COLLECT
- Full Autel Auto Scan report — all modules, all DTCs, freeze frame data
- SRS module: deployment status, crash/event data record (if available), pretensioner status
- ADAS module: radar/camera calibration status codes, alignment/aim values
- Photos of all visible exterior/interior damage (for records/insurance)
- Coolant level and pressure test result
- Wheel alignment printout (camber/caster/toe, all four corners)
- 48V EQBoost battery voltage, BSG live data PIDs, any related fault codes
- Customer/advisor account of impact direction, speed, and post-accident drivability

**ملخص عربي:** يجب تسجيل تقرير الأوتيل الكامل، حالة الوسائد، معايرة ADAS، صور التلف، ضغط التبريد، محاذاة العجلات، وبيانات نظام 48V.

## 5) SAFETY
- **SRS/pyrotechnics:** Do not work near airbags, pretensioners, or SRS wiring without following OEM disarm procedure (disconnect 12V battery, wait per OEM-specified time) — get exact procedure from TOPIx/ALLDATA for this VIN. Treat any undeployed unit as live.
- **48V EQBoost system:** Higher-voltage mild-hybrid circuit — verify system is de-energized per OEM procedure before touching BSG/battery wiring, especially if damage is suspected in that area.
- **Lifting:** If structural/subframe damage is suspected, inspect lift points and jack points before hoisting — do not lift on a compromised area.

**ملخص عربي:** احتياطات إلزامية عند وجود وسائد هوائية، نظام 48V، أو شك بتلف هيكلي قبل الرفع.

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DRAFT — the technician must verify before any part is ordered. مسودة — القرار النهائي للفني.