DTC U029A-123: Lost Communication with Hybrid Battery Pack Sensor Module: Procedure

NG → REPLACE FUSE (IGCT NO. 3) 

OK: Go to next step 

NG → REPLACE RELAY (IGCT MAIN) 

OK: Go to next step 

NG → See step   6 

OK: Go to next step 

1. Disconnect the cable from the negative (-) battery terminal.
2. Check that the service plug grip is not installed.
   NOTE:

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

3. Remove the battery cover. Refer to REMOVAL .
4. Disconnect the D72 connector from the hybrid vehicle control ECU. Refer to REMOVAL .
5. Disconnect the z21 connector from the battery smart unit.
6. Measure the resistance according to the value(s) in the table below.
   Fig 1: Checking Harness And Connector (Hybrid Vehicle Control ECU - Battery Smart Unit)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance (Check for Open)

   Tester Connection	Switch Condition	Specified Condition
   D72-32 (BTH+) - z21-2 (BTH+)	Ignition switch off	Below 1 Ω
   D72-33 (BTH-) - z21-3 (BTH-)	Ignition switch off	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Switch Condition	Specified Condition
   D72-32 (BTH+) or z21-2 (BTH+) - Body ground	Ignition switch off	10 kΩ or higher
   D72-33 (BTH-) or z21-3 (BTH-) - Body ground	Ignition switch off	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Rear view of wire harness connector (to Hybrid Vehicle Control ECU)
   *2	Rear view of wire harness connector (to Battery Smart Unit)

7. Connect the cable to the negative (-) battery terminal.
8. Turn the ignition switch to ON.
9. Measure the voltage according to the value(s) in the table below
   NOTE:

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   D72-32 (BTH+) - Body ground	Ignition switch ON	Below 1 V
   D72-33 (BTH-) - Body ground	Ignition switch ON	Below 1 V

   NOTE:

   • If the ignition switch is turned ON with the service plug grip removed, DTC P0A0D-350 for the interlock switch system will be stored. If this DTC is output, clear the DTC using the Techstream. Refer to DTC CHECK / CLEAR .
   • If the ignition switch is turned ON with the connector removed from the sensor, DTC will be stored. If DTC is output, clear the DTC using the Techstream. Refer to DTC CHECK / CLEAR .

NG → See step   8 

OK: Go to next step 

1. Disconnect the cable from the negative (-) battery terminal.
2. Check that the service plug grip is not installed.
   NOTE:

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

3. Remove the battery cover. Refer to REMOVAL .
4. Remove the battery smart unit. Refer to REMOVAL .

   HINT: 

   Do not disconnect the battery smart unit connector.

5. Connect the cable to the negative (-) battery terminal.
6. Connect an oscilloscope between the battery smart unit terminals specified in the table below, and measure the waveform.
   Fig 2: Checking Battery Smart Unit With Waveform Reference

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Item	Content
   Tester Connection	CH1: z21-2 (BTH+) - z21-5 (GND) CH2: z21-3 (BTH-) - z21-5 (GND)
   Equipment Setting	2 V/DIV., 500 μs/DIV.
   Condition	Ignition switch ON

   OK

   The waveform in the illustration can be measured.

   NOTE:

   • After removing the service plug grip, do not turn the ignition switch ON (READY), unless instructed by the repair information because this may cause a malfunction.
   • If the ignition switch is turned ON (IG) with the service plug grip removed, DTC P0A0D-350 for the interlock switch system will be stored. If this DTC is output, clear the DTC using the Techstream. Refer to DTC CHECK / CLEAR .
   TEXT IN ILLUSTRATION
   
   

   *1	Component with harness connected (Battery Smart Unit)
   *2	CH1
   *3	CH2

NG → See step   9 

OK → See step   10 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 2 BATTERY PACK WIRE) 

OK: Go to next step 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → CHECK AND REPAIR POWER SOURCE CIRCUIT 

1. Disconnect the cable from the negative (-) battery terminal.
2. Check that the service plug grip is not installed.
   NOTE:

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

3. Remove the battery cover. Refer to REMOVAL .
4. Disconnect the Oz3 connector from the No. 2 battery pack wire.
   Fig 3: Identifying OZ3 Connector And No. 2 Battery Pack Wire

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Disconnect the z21 connector from the battery smart unit.
6. Measure the resistance according to the value(s) in the table below.
   Fig 4: Checking Harness And Connector (No. 2 Battery Pack Wire)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance (Check for Open)

   Tester Connection	Switch Condition	Specified Condition
   z21-2 (BTH+) - Oz3-7 (BTH+)	Ignition switch off	Below 1 Ω
   z21-3 (BTH-) - Oz3-14 (BTH-)	Ignition switch off	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Switch Condition	Specified Condition
   z21-2 (BTH+) or Oz3-7 (BTH+) - Body ground	Ignition switch off	10 kΩ or higher
   z21-3 (BTH-) or Oz3-14 (BTH-) - Body ground	Ignition switch off	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Rear view of wire harness connector (to Battery Smart Unit)
   *2	Front view of wire harness connector (to No. 2 Battery Pack Wire Connector)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 2 BATTERY PACK WIRE) 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR