Driver Seat Control ECU Communication Stop Mode [06/2018 - 08/2021]: Procedure

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the U48 position control ECU assembly LH connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   U48-13 (CANP) - U48-14 (CANN)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Position Control ECU Assembly LH)

   Result

   Result
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (POSITION CONTROL ECU ASSEMBLY LH) 

Result: 

OK 

See step  2

1. Disconnect the U46 position control ECU assembly LH connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   U46-2 (GND) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Position Control ECU Assembly LH)

3. Reconnect the cable to the negative (-) battery terminal.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   U46-3 (+B) - Body ground	Always	11 to 14 V
   U48-1 (IG) - Body ground	Engine switch on (IG)	11 to 14 V
   U48-15 (SYSB) - Body ground	Always	11 to 14 V

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE POSITION CONTROL ECU ASSEMBLY LH 

• for TMC Made:

  Refer to REMOVAL [06/2018 - 08/2021]

• for TMMK Made:

  Refer to REMOVAL [06/2018 - 08/2021]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)