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 MANUALSINFINITI2002Q45 V8-4.5L (VK45DE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSINFORMATION BUSDESCRIPTION AND OPERATIONIVMS (LAN) SYSTEMSLEEP/WAKE-UP CONTROL
2002 Infiniti Q45 V8-4.5L (VK45DE)
Sleep/Wake-Up Control
2002 Infiniti Q45 V8-4.5L (VK45DE)SECTION Sleep/Wake-Up Control
Sleep Control:
SLEEP CONTROL
"Sleep" control prevents unnecessary power consumption. After the following conditions are met, the BCM suspends the communication between itself and all LCU's. The whole IVMS is set in the "sleep" mode.
- Ignition switch "OFF"
- All electrical loads (in the IVMS) "OFF"
- Timer "OFF"
Wake-up Control:
WAKE-UP CONTROL
As shown above, when the BCM detects a "wake-up" signal, it wakes up the whole system and starts communicating again. The "sleep" mode of all LCU's is now canceled, and the BCM returns to the normal control mode. When any one of the following switches are turned ON, the "sleep" mode is canceled:
- All switches combined or connected with BCM
- All switches combined or connected with LCU
RENDER: 1.0x
NO RELATED
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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.