Welcome to 603 Auto Salvage, We Sell Quality Used Auto Parts at Affordable prices.
Welcome to 603 Auto Salvage, We Sell Quality Used Auto Parts at Affordable prices.
$75.00
Grade A chassis brain box (steering control module) removed from a 2004 Mazda RX8. This OEM electronic control unit manages steering functions and has been inspected for proper operation. Interchange #59385, Stock #0530232533.
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This Grade A chassis brain box was carefully removed from a 2004 Mazda RX8 donor vehicle. Located in the right-hand engine compartment, this steering control module has been thoroughly inspected by our technicians and is currently on the shelf ready for immediate shipment. The unit shows excellent condition with no visible damage to the housing or electrical connections.
The chassis brain box is a critical electronic control module that manages various steering system functions in the RX8. These units commonly require replacement due to electrical failures, water damage, or internal component degradation that can cause steering assist problems, warning lights, or complete system failure. When the original unit fails, symptoms may include loss of power steering assist, erratic steering behavior, or dashboard warning messages.
At 603 Auto Salvage, we maintain over 50,000 quality used parts in stock from more than 1,100 vehicles. Our experienced team can help you find the exact OEM replacement part you need for your repair. Call us to verify compatibility with your specific vehicle or browse our extensive online inventory to find additional Mazda RX8 parts. 50,000+ parts in stock from over 1,100 vehicles. Contact us or call (603) 392-7313 for anything you need.
| Part | Chassis Brain Box – Steering Control Module |
| Interchange # | 59385 |
| OEM Part Number | Contact for OEM# |
| Side | N/A |
| Part Grade | A — Grade A – Excellent working condition, inspected and ready to ship |
| Warranty | 90-Day Warranty (Standard warranty for tested electronic control modules) |
| Type | Used OEM |
| Year / Make / Model | 2004 MAZDA RX8 |
| VIN | N/A |
| Vehicle Stock # | 0530232533 |
Every part at 603 Auto Salvage is inspected before listing. Here is what was verified on this Chassis Brain Box – Steering Control Module:
| ✅ Housing Integrity | No cracks or damage to protective casing |
| ✅ Connector Pins | All electrical pins clean and undamaged |
| ✅ Circuit Board | No visible corrosion or component damage |
| ✅ Mounting Points | All mounting tabs and brackets intact |
| ✅ Part Number Verification | Confirmed correct part number 591 for application |
Based on interchange #59385, this part fits the following vehicles. Always confirm fitment with your mechanic before purchasing.
| Year(s) | Make | Model | Notes |
|---|---|---|---|
| 2004-2008 | Mazda | RX-8 | All trim levels with electronic steering |
| 2009-2011 | Mazda | RX-8 | Verify part number compatibility |
| 2004-2008 | Mazda | RX-8 | Base, Sport, Touring, Grand Touring trims |
Questions? Need a shipping quote? Call us now:
603 Auto Salvage | 233 Main St, Plaistow, NH 03865
Mon–Fri 8am–4:30pm | Sat 8am–2pm | Sun Closed
The chassis brain box is an electronic control module that manages steering system functions including power steering assist and related safety systems. It processes input from various sensors to optimize steering performance and vehicle stability.
Common symptoms include loss of power steering assist, steering wheel warning lights, erratic steering behavior, or complete steering system failure. A diagnostic scan can confirm if the chassis brain box is sending error codes.
Most chassis brain boxes require programming or initialization to match your specific vehicle’s VIN and configuration. Contact a qualified Mazda technician or automotive electronics specialist for proper installation and programming.
This part is compatible with 2004 RX8 models, but we recommend verifying the part number on your original unit matches before ordering. Different trim levels or production dates may use slightly different modules.
Common causes include electrical surges, water damage from leaks, age-related component degradation, and vibration damage. The RX8’s engine bay location can expose the module to heat and moisture over time.
Looking for this part by number? Here are the reference numbers:
| Mazda Part Number | 591 |
| Interchange Number | 59385 |
| Location Code | RH Engine Compartment |
| Source | Price Range | Warranty | Notes |
|---|---|---|---|
| Dealer (New OEM) | $250-$400 | 1 year | Brand new, longest wait time |
| Aftermarket | $150-$275 | Varies | Non-OEM fitment, quality varies |
| Other Salvage Yards | $85-$125 | 30–60 days | Varies in quality and testing |
| 603 Auto Salvage | $75 | 90-Day Warranty | Tested, Grade A, ships in 24hrs |
🔍 Free Fitment Check
Call us with your VIN and we will verify compatibility for free. No obligation, no pressure — just answers.
Our parts specialists check interchange data in real-time
This part ships via FedEx Ground. Prices are estimates — call for an exact quote to your zip code.
| Region | Estimated Cost | Transit Time |
|---|---|---|
| New England (NH, MA, ME, VT, CT, RI) | $15 – $30 | 1–3 business days |
| Northeast (NY, NJ, PA, MD, VA) | $20 – $40 | 2–4 business days |
| Southeast (FL, GA, NC, SC, TN) | $25 – $45 | 3–5 business days |
| Midwest (OH, MI, IL, IN, WI, MN) | $30 – $50 | 3–5 business days |
| Southwest (TX, AZ, NM, OK) | $35 – $55 | 4–6 business days |
| West Coast (CA, OR, WA) | $40 – $65 | 5–7 business days |
Local pickup is always free. Free delivery within 30 miles of Plaistow, NH.
Ready to order? Call (603) 392-7313 or add to cart above. We are here to help.
| Weight | 2 lbs |
|---|
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