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.
2003 Lexus IS 300 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Electrical Component Locator: Miscellaneous
MISCELLANEOUS LOCATION
| Component | Component Location |
|---|---|
| Antenna Amplifier | Behind center of dash. See Figure. |
| Data Link Connector (DLC) No. 1 | On left front of engine compartment, forward of engine room No. 3 R/B. See Figure. |
| Data Link Connector (DLC) No. 3 | Behind lower left side of dash. See Figure. |
| Daytime Running Light Resistor | On right side of engine compartment, on strut tower. See Figure. |
| Diode (A/C) | Behind right end of dash. See Figure. |
| Diode (Headlight Cleaner) | Behind upper left side of dash. |
| Diode (Luggage Compartment Light) (Sedan) | On rear speaker shelf. |
| Diode (Luggage Compartment Light) (Wagon) | Above left rear fenderwell. |
| Fuel Pump Resistor | On left side of engine compartment, on strut tower. See Figure. |
| Ignitor | On left side of engine compartment, on strut tower. See Figure. |
| Junction Connectors No. 1, 2, 3 & 4 | On left side of engine compartment, near engine control module. |
| Junction Connector No. 5 | Behind left end of dash, above driver side J/B. |
| Junction Connector No. 6 | Behind left side of dash, forward of instrument cluster. |
| Junction Connectors No. 7, 8, 9 & 10 | Behind upper right side of dash. |
| Junction Connector No. 11 | In left front door. |
| Junction Connectors No. 12 & 13 | Above left rear fenderwell. |
| Junction Connector No. 14 (Sedan) | On left side of luggage compartment, behind left fenderwell. |
| Junction Connector No. 15 | On left side of luggage compartment, behind left fenderwell. |
| Junction Connector No. 16 | Above right rear fenderwell. |
| Junction Connector No. 17 (Wagon) | Above left rear fenderwell. |
| Junction Connector No. 18 (Wagon) | In rear of liftgate. |
| Noise Filter (DEF CDS) | On driver side J/B. |
| Noise Filter (Ignition) | On left side of engine. See Figure. |
| Noise Filter (Rear Window Defogger) | Near base of right "C" pillar. |
| Noise Filter (Stoplight) | Above left rear fenderwell. |
| Pretensioner (Left/Right) | At base of respective "B" pillar. |
| Stereo Component Amplifier | Behind right end of dash. See Figure. |
| Telephone Microphone | Behind left end of dash, above instrument panel J/B. See Figure. |
| Telephone Transceiver & Speaker Relay | On left side of luggage compartment, near fuel filler door. See Figure. |
| Theft Deterrent Horn | On left side of engine compartment, on strut tower. See Figure. |
| Transponder Key Amplifier | On steering column, near ignition switch. See Figure. |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.