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 MANUALSLEXUS2011HS 250H L4-2.4L (2AZ-FXE) HYBRIDREPAIR AND DIAGNOSISTESTING AND INSPECTIONPROGRAMMING AND RELEARNINGPROCEDURES NECESSARY WHEN BATTERY TERMINAL IS DISCONNECTED/RECONNECTED
2011 Lexus HS 250h L4-2.4L (2AZ-FXE) Hybrid
Procedures Necessary When Battery Terminal Is Disconnected/Reconnected
2011 Lexus HS 250h L4-2.4L (2AZ-FXE) HybridSECTION Procedures Necessary When Battery Terminal Is Disconnected/Reconnected
PROCEDURES NECESSARY WHEN BATTERY TERMINAL IS DISCONNECTED/RECONNECTED
a. THE WORK LIST
1. Each inspection procedure as follows.
NOTICE:
- After the power switch is turned off, the display and navigation module display (HDD navigation system) records various types of memory and settings. As a result, after turning the power switch off, make sure to wait at least 60 seconds before disconnecting the cable from the negative (-) battery terminal.
- When the auxiliary battery is replaced or the cable is disconnected from its negative (-) battery terminal, the ISC learning value will be initialized and symptoms as a noise from the hybrid vehicle transaxle assembly may occur until ISC learning is performed.
Therefore, perform ISC learning when the auxiliary battery is replaced or the cable is disconnected from the negative (-) terminal of the auxiliary battery.
a. THE WORK LIST
1. Each inspection procedure as follows.
NOTICE:
- After the power switch is turned off, the display and navigation module display (HDD navigation system) records various types of memory and settings. As a result, after turning the power switch off, make sure to wait at least 60 seconds before disconnecting the cable from the negative (-) battery terminal.
- When the auxiliary battery is replaced or the cable is disconnected from its negative (-) battery terminal, the ISC learning value will be initialized and symptoms as a noise from the hybrid vehicle transaxle assembly may occur until ISC learning is performed.
Therefore, perform ISC learning when the auxiliary battery is replaced or the cable is disconnected from the negative (-) terminal of the auxiliary battery.
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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.