DTC B2226-31: PBD Unit Pulse Sensor LH Circuit No Signal [10/2023 - ]: Procedure

1. Clear the DTCs.

   Body Electrical > Back Door > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Perform a power back door open or close operation.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  3

1. Check for DTCs.

   Body Electrical > Back Door > Trouble Codes 

   Result

   Result	Proceed to
   B2226-31 is output	A
   B2226-31 is not output	B

Result: 

B 

USE SIMULATION METHOD TO CHECK 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ]

Result: 

A 

See step  4

1. Disconnect the R27 multiplex network door ECU connector.
2. Disconnect the R21 power back door unit assembly set LH connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   R27-11 (DSG) - R21-4 (DSG)	Always	Below 1 Ω
   R27-4 (DSV) - R21-3 (DSV)	Always	Below 1 Ω
   R27-5 (DS2) - R21-6 (DS2)	Always	Below 1 Ω
   R27-13 (DS1) - R21-5 (DS1)	Always	Below 1 Ω
   R27-11 (DSG) or R21-4 (DSG) - Body ground	Always	10 kΩ or higher
   R27-4 (DSV) or R21-3 (DSV) - Body ground	Always	10 kΩ or higher
   R27-5 (DS2) or R21-6 (DS2) - Body ground	Always	10 kΩ or higher
   R27-13 (DS1) or R21-5 (DS1) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the R21 power back door unit assembly set LH connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   R21-4 (DSG) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   R21-5 (DS1) - Body ground	Ignition switch off	7 V or higher
   R21-6 (DS2) - Body ground	Ignition switch off	7 V or higher
   R21-3 (DSV) - Body ground	Ignition switch off	7 V or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE MULTIPLEX NETWORK DOOR ECU 

Refer to REMOVAL [10/2023 - ]

Result: 

OK 

See step  6

1. Using an oscilloscope, check the waveform of each terminal from the rear of the multiplex network door ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Multiplex Network Door ECU)	*b	Waveform (CH1)
   *c	Waveform (CH2)	-	-

   Measurement Condition

   Item	Condition
   Tester Connection	CH1: R27-13 (DS1) - Body ground CH2: R27-5 (DS2) - Body ground
   Tool Setting	2 V/DIV., 2 ms./DIV.
   Vehicle Condition	Open and close the back door by hand.

   HINT: 

   • The period changes in accordance to the speed at which the back door is opened and closed by hand.
   • The wave height changes in accordance with the auxiliary battery voltage.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MULTIPLEX NETWORK DOOR ECU 

Refer to REMOVAL [10/2023 - ]

Result: 

NG 

REPLACE POWER BACK DOOR UNIT ASSEMBLY SET LH 

Refer to REMOVAL [10/2023 - ]