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Home >> Toyota >> 2013 >> Prius V >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Battery Management Systems >> Hybrid Battery System (Diagnostic Codes (P0A7F-123 - U029A-123)) >> Hybrid Battery System >> DTC U029A-123: Lost Communication with Hybrid Battery Pack Sensor Module >> Inspection Procedure

Inspection Procedure

WARNING:
  • If the battery cover is removed, install it before turning the power switch on (IG) or (READY). If the power switch is turned on (IG) or (READY) with the battery cover removed, U029A-123 may be stored.
  • Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
  • After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work. Refer to PRECAUTION .

    HINT: 

    At least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

NOTE:

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

HINT: 

After the repair, clear the DTCs, turn the power switch on (IG), wait for 1 minute or more and check for DTCs.

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