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.
1997 Infiniti Q45 BaseFACTORY OEM SERVICE PROCEDURE
Multiplex Control System
- Description & Operation
- Component Locations
- Component Tests
- Self-Diagnostic System
- Diagnostic Tests
- DTC 24: Communication Fault With Left Front Door Control Unit (LCU01)
- DTC 25: No Communication With Left Front Door Control Unit (LCU01)
- DTC 34: Communication Fault With Right Front Door Control Unit (LCU02)
- DTC 35: No Communication With Right Front Door Control Unit (LCU02)
- DTC 41: Communication Fault With Right Rear Door Control Unit (LCU03)
- DTC 42: No Communication With Right Rear Door Control Unit (LCU03)
- DTC 44: Communication Fault With Left Rear Door Control Unit (LCU04)
- DTC 45: No Communication With Left Rear Door Control Unit (LCU04)
- DTC 47: Communication Fault With Driver's Seat Control Unit (LCU05)
- DTC 48: No Communication With Driver's Seat Control Unit (LCU05)
- Wiring Diagrams
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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