HYBRID BATTERY SYSTEM, Diagnostic DTC:U029A-123

DTC Code DTC Name
U029A-123 Lost Communication with Hybrid Battery Pack Sensor Module

DESCRIPTION

The battery smart unit detects the HV battery conditions (voltage, current, and temperature) and the battery cooling fan voltage, and sends the detected signals to the power management control ECU via the serial communication system.

DTC No. DTC Detection Condition Trouble Area
U029A-123 Problem in serial communication between the battery smart unit and power management control ECU (1 trip detection)

  • Wire harness or connector

  • Power management control ECU

  • Battery smart unit

WIRING DIAGRAM

A01NFHFE02

INSPECTION PROCEDURE

CAUTION:


  • 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 set.

  • 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 disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals.

    Tech Tips

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

Note

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 for the time specified in the following table before disconnecting the cable from the negative (-) battery terminal.

Waiting Time before Disconnecting Cable from Negative (-) Battery Terminal
Specification Waiting Time
w/o Telematics transceiver 60 sec.
w/ Telematics transceiver 120 sec.

PROCEDURE


  1. CHECK DTC OUTPUT (HV)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Read output DTCs Click here.

      Result
      Result Proceed to
      Only U029A-123 is output. A
      DTCs other than U029A-123 are also output. B

    5. Disconnect the intelligent tester from the DLC3.


    B

    GO TO DTC CHART Click here

    A

  2. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY SMART UNIT)

    CAUTION:

    Be sure to wear insulated gloves and protective goggles.


    1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

    2. Disconnect the F97 connector from the power management control ECU.

      Tech Tips


    3. Remove the battery smart unit Click here.

      Tech Tips

      Disconnect only the z30 connector of the battery smart unit.

    4. A01NGIOE05
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)
      *b

      Rear view of wire harness connector

      (to Battery Smart Unit)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      z30-2 (BTH+) - z30-5 (GND) and Body ground Power switch off 10 kΩ or higher
      z30-3 (BTH-) - z30-5 (GND) and Body ground Power switch off 10 kΩ or higher
      F97-32 (BTH+) - z30-2 (BTH+) Power switch off Below 1Ω
      F97-33 (BTH-) - z30-3 (BTH-) Power switch off Below 1Ω
    5. A01NHIYE01
      Text in Illustration
      *1 Engine Room Relay Block No. 2
      *2 IGCT No. 3 Fuse

      Remove the IGCT No. 3 fuse from the engine room relay block No. 2.

    6. A01NF1AE01
      Text in Illustration
      *1 Engine Room Junction Block Assembly
      *2 AM2 Fuse

      Remove the AM2 fuse from the engine room junction block assembly.

    7. A01NF4XE01
      Text in Illustration
      *1 Instrument Panel J/B Assembly
      *2 ECU IG2 Fuse

      Remove the ECU IG2 fuse from the instrument panel J/B assembly.

    8. Disconnect the all connectors from the power management control ECU.

    9. Measure the resistance according to the value(s) in the table below.

      A01NE8YE06
      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F97-32 (BTH+) - F98-7 (AM21) Power switch off 10 kΩ or higher
      F97-32 (BTH+) - F97-1 (AM22) Power switch off 10 kΩ or higher
      F97-32 (BTH+) - A81-5 (+B1) Power switch off 10 kΩ or higher
      F97-32 (BTH+) - A80-2 (+B2) Power switch off 10 kΩ or higher
      F97-32 (BTH+) - A81-6 (MREL) Power switch off 10 kΩ or higher
      F97-32 (BTH+) - A81-1 (IG2) Power switch off 10 kΩ or higher
      F97-32 (BTH+) - F98-1 (ACCD) Power switch off 10 kΩ or higher
      F97-32 (BTH+) - F98-2 (IG1D) Power switch off 10 kΩ or higher
      F97-32 (BTH+) - A81-2 (IG2D) Power switch off 10 kΩ or higher
      F97-32 (BTH+) - F97-14 (SPDI) Power switch off 10 kΩ or higher
      F97-32 (BTH+) - A80-16 (GI) Power switch off 10 kΩ or higher
      F97-32 (BTH+) - A80-4 (FCTL) Power switch off 10 kΩ or higher
      F97-33 (BTH-) - F98-7 (AM21) Power switch off 10 kΩ or higher
      F97-33 (BTH-) - F97-1 (AM22) Power switch off 10 kΩ or higher
      F97-33 (BTH-) - A81-5 (+B1) Power switch off 10 kΩ or higher
      F97-33 (BTH-) - A80-2 (+B2) Power switch off 10 kΩ or higher
      F97-33 (BTH-) - A81-6 (MREL) Power switch off 10 kΩ or higher
      F97-33 (BTH-) - A81-1 (IG2) Power switch off 10 kΩ or higher
      F97-33 (BTH-) - F98-1 (ACCD) Power switch off 10 kΩ or higher
      F97-33 (BTH-) - F98-2 (IG1D) Power switch off 10 kΩ or higher
      F97-33 (BTH-) - A81-2 (IG2D) Power switch off 10 kΩ or higher
      F97-33 (BTH-) - F97-14 (SPDI) Power switch off 10 kΩ or higher
      F97-33 (BTH-) - A80-16 (GI) Power switch off 10 kΩ or higher
      F97-33 (BTH-) - A80-4 (FCTL) Power switch off 10 kΩ or higher
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

    10. Install the IGCT No. 3 fuse, AM2 fuse and ECU IG2 fuse.

    11. Connect the 4 connectors to the power management control ECU.

      Tech Tips


    12. Install the battery smart unit Click here.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK POWER MANAGEMENT CONTROL ECU

    CAUTION:

    Be sure to wear insulated gloves and protective goggles.


    1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

    2. Remove the battery smart unit Click here.

      Tech Tips

      Disconnect only the z30 connector of the battery smart unit.

    3. Turn the power switch on (IG).

      Note


      • After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

      • If the power switch is turned on (IG) with the service plug grip removed, DTCs will be stored. If these DTCs are output, clear the DTCs using the intelligent tester Click here.

    4. A01NHTQE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Battery Smart Unit)

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      z30-2 (BTH+) - z30-5 (GND) Power switch on (IG) 2.3 to 2.7 V
      z30-3 (BTH-) - z30-5 (GND) Power switch on (IG) 2.3 to 2.7 V

    5. Turn the power switch off.

    6. A01NHTQE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Battery Smart Unit)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      z30-2 (BTH+) - z30-3 (BTH-) Power switch off 4.4 to 5.4 kΩ
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

      Tech Tips

      Resistance becomes 2.0 kΩ or less when there is short circuit in the power management control ECU.

    7. Install the battery smart unit Click here.


    B

    REPLACE POWER MANAGEMENT CONTROL ECU (for LHD) Click here

    C

    REPLACE POWER MANAGEMENT CONTROL ECU (for RHD) Click here

    A

    REPLACE BATTERY SMART UNIT Click here