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.
2004 Infiniti Q45FACTORY OEM SERVICE PROCEDURE
8. Check Headlamp Input Signal Circuit
- Stop engine.
- Disconnect headlamp battery saver control unit harness connector.
- Disconnect BCM harness connector.
- Disconnect combination meter harness connector.
- Check harness continuity between the following;
headlamp battery saver control unit terminals 2, 8 and combination meter terminal 32,
BCM terminal 5 and combination meter terminal 32.
Refer to Wiring Diagram.
- Continuity should exist.
- Also check harness for short to ground and short to power.
OK or NG
OK: GO TO 10.
NG: GO TO 9.
Factory Service Tools
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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.