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.
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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 161 (STEERING COLUMN SWITCHES)DESCRIPTION & OPERATIONCOMBINATION SWITCHSYSTEM OUTLINE
2004 Toyota Matrix XR, FWD, Standard
System Outline
2004 Toyota Matrix XR, FWD, StandardSECTION System Outline
WARNING: This page is about a different car, the 2003 Lexus GS 430, 2003 Lexus GS 300, 2002 Lexus GS 430, and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
- Light Control Switch Set At HEAD - When the light control switch is set to the HEAD position (2nd clickstop), the signal is input to connector B6 terminal No. 15 (HEAD) of the body ECU No. 2. See WIRING DIAGRAMS . This activates the body ECU No. 2 and turns on the HEAD LP relay. When the signal is input to terminal No. 2 of the daytime running light relay (main), the daytime running light system deactivated and headlights LH and RH (high) go off. At this time, the current flows from the battery into the MAIN fuse (40-amp) to HEAD LP relay (point side) to H-LP L LWR and H-LP R LWR fuses (15-amp) to terminal No. 1 of the headlights LH and RH (low), except HID type, or terminal No. 1 (HID type) to GROUND, to turn on the headlights (low beam).
- Light Control Switch Set At TAIL Or HEAD - When the light control switch is turned to the TAIL (1st clickstop) or HEAD (2nd clickstop) position, the signal is input to connector B6 terminal No. 2 (TAIL) of the body ECU No. 2. This activates the body ECU No. 2 to flow the current from the battery into the ALT fuse (120-amp), TAIL relay (coil side), terminal No. 6 (TRLY) of the body ECU No. 2 to GROUND in that order to turn on the TAIL relay. The current flows from the TAIL fuse (10-amp) into the parking lights, front side marker lights, license plate lights, terminal No. 5 of the light failure sensor to terminal No. 7 and No. 12 to taillights, and rear side marker lights in that order to turn on each light.
- Dimmer Switch Set At HIGH - When the light control switch is set to the HEAD position (2nd clickstop), the current flows into the daytime running light relay No. 3 and No. 4 (coil side) to turn on the relay as the headlights (low beam) light up. At this time, when the dimmer switch is set to the HIGH position, the signal is input to terminal No. 8 of the daytime running light relay (main). This activates the DIMMER DRL NO. 2 relay to flow the current from the battery into the MAIN fuse (40-amp) to DRL NO. 2 fuse (30-amp) to DIMMER DRL NO. 2 relay (point side) to headlights LH and RH (high) to daytime running light relay No. 4 (point side) to GROUND, to turn on the headlights (high or low) and high beam indicator at the same time.
- Dimmer Switch Set At FLASH - When the dimmer switch is set to FLASH position, the current flows from the battery into the MAIN fuse (40-amp), the HEAD LP relay (coil side) to terminal No. 9 of the combination switch to terminal No. 17 to GROUND in that order to turn on the HEAD LP relay. Additionally, the signal is input to terminal No. 8 of the daytime running light relay (main) to activate the relay and turn on the DIMMER DRL NO. 2 relay. In the same manner as the dimmer switch is set at the HIGH position, the headlights (high and low) and high beam indicator light turned on at the same time.
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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.