Check the 50A EPS link in the engine bay relay box on the driver’s side–this is the primary safeguard for the electric assist system in the 2006 2.5L rear-wheel-drive sedan. The block sits next to the battery under a plastic cover; release the clips and inspect the high-amperage strip labeled “EPS” or “P/S.” A blown strip shows a visible break in the metal bridge.
A secondary control element for the assist module is placed inside the cabin panel beneath the dashboard on the driver’s side. Remove the trim cover near the footwell to access mini blade inserts; look for a 7.5A or 10A slot marked with abbreviations tied to the assist controller or ECU. Use a multimeter rather than visual inspection alone–hairline failures are common and easy to miss.
Access path and orientation: in the engine compartment box, the high-current strip sits along the outer row closest to the fender, typically the third or fourth position from the front edge. The cabin panel arranges small inserts in vertical columns; the relevant slot is usually in the upper third, slightly right of center. Cross-check the cover legend–markings differ by market version.
Replacement steps: disconnect the negative battery terminal, pull the faulty strip with fuse pliers, and install a unit with identical amperage and footprint. Do not up-rate the value–overcurrent protection is calibrated for the assist motor and control unit. After installation, reconnect the battery and turn the wheel lock-to-lock at idle to allow the system to recalibrate.
Common failure triggers: low battery voltage, corrosion in the relay box, or a short in the assist motor harness near the front subframe. If a new strip fails immediately, inspect the wiring loom for abrasion and check the motor connector for moisture ingress before fitting another component.
2006 Luxury Sport Sedan Assist System Electrical Protection Layout
Check the 50A EPS circuit protector in the engine bay block on the driver’s side, positioned next to the battery housing; it is labeled as the electric assist control unit supply and typically sits in the upper row, third slot from the left. Access requires removing the plastic cover and referencing the molded scheme on its underside, where the EPS marking identifies the correct high-amperage insert. If the assist wheel becomes stiff or unresponsive, inspect this element first for continuity or visible burn marks before moving to deeper diagnostics.
Cabin Panel Reference
Inside the passenger compartment, the secondary protection element for the assist electronics is placed behind the lower dashboard panel near the driver’s knee area. After removing the trim, locate a 7.5A mini insert labeled ECU-IG or similar designation tied to ignition-fed control modules. This smaller component supports signal integrity for the assist system rather than direct motor current. A failure here may result in warning lights without total loss of assist, making it easy to misdiagnose if only the main high-current unit is checked.
Practical Identification Tips
Use the amperage rating and label codes rather than relying on position alone, since regional variations can shift slot order. The under-hood block uses larger cartridge-style inserts, while the interior panel relies on blade-type units with color-coded tops. Always disconnect the battery before extraction, and confirm replacement matches both rating and footprint to avoid control module faults or wiring damage.
Exact fuse box placement for EPS system in 2006 IS series sedan and access steps
Open the hood and go directly to the right-hand side of the engine bay (passenger side in LHD cars): the needed electrical protection element for the assist system sits inside the main relay and fuse housing near the battery, under a black plastic cover with locking tabs.
To reach it, press the two side clips on the cover and lift it upward; the inside panel shows a printed scheme where the EPS circuit is marked as a high-amperage unit (usually 50A–80A), positioned closer to the outer edge of the box rather than the center cluster.
Access sequence
- Switch ignition fully off and remove the key
- Disconnect negative battery terminal to avoid short circuits
- Release plastic cover tabs and remove the lid
- Locate the EPS-marked high-current element using the inner map
- Use fuse puller or pliers with insulation to extract it
The component is not inside the cabin panel under the dashboard; many confuse it with interior circuits, but the assist system relies on a higher load unit placed only in the engine compartment block due to current demands.
Practical tips
- If the metal strip inside looks intact but issues persist, check adjacent relays in the same box
- Corrosion on terminals can interrupt contact–inspect and clean if needed
- Always match amperage exactly; installing a lower or higher rating can cause malfunction or wiring damage
After reinstalling, secure the cover firmly until both clips click, reconnect the battery, and test wheel assist response immediately at idle before driving.