Dtc B1620/21 Driver Side - Side Airbag Sensor Circuit Malfunction

Vehicle Interior. Yaris. Ncp93, 131
Supplemental Restraint Systems. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

CHECK SIDE AIRBAG SENSOR RH

CHECK SIDE AIRBAG SENSOR LH

DTC B1620/21 Driver Side - Side Airbag Sensor Circuit Malfunction

DTC B1622/81 Lost Communication with Driver Side - Side Airbag Sensor Assembly

DTC B1625/22 Front Passenger Side - Side Airbag Sensor Circuit Malfunction

DTC B1627/82 Lost Communication with Front Passenger Side - Side Airbag Sensor Assembly


DESCRIPTION

for DTC B1620/21 and B1625/22:
The side airbag sensor LH and RH consists of the safing sensor, the diagnostic circuit, the lateral deceleration sensor, etc.
If the center airbag sensor assembly receives signals from the lateral deceleration sensor, it determines whether the SRS should be activated.
DTC B1620/21 or B1625/22 is recorded when a malfunction is detected in the side airbag sensor LH or RH circuit.
for DTC B1622/81 and B1627/82:
The circuit for the side collision sensor LH or RH (to determine deployment of the front seat side airbag LH or RH, and curtain shield airbag LH or RH) is composed of the center airbag sensor assembly, side airbag sensor LH or RH, and rear airbag sensor LH or RH.
The side airbag sensor LH or RH, and rear airbag sensor LH or RH detect impacts to the vehicle and send signals to the center airbag sensor assembly to determine if the airbag should be deployed.
DTC B1622/81 or B1627/82 is recorded when a malfunction is detected in the circuit for the side collision sensor LH or RH (to determine deployment of the front seat side airbag LH or RH, and curtain shield airbag LH or RH).

DTC Code
Detection Condition
Trouble Area
B1620/21
B1622/81
When one of following conditions is met:
  1. Side airbag sensor LH malfunction
  2. Center airbag sensor assembly malfunction
  1. Side airbag sensor LH
  2. Center airbag sensor assembly
B1625/22
B1627/82
When one of following conditions is met:
  1. Side airbag sensor RH malfunction
  2. Center airbag sensor assembly malfunction
  1. Side airbag sensor RH
  2. Center airbag sensor assembly

WIRING DIAGRAM


Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1620/21 Driver Side - Side Airbag Sensor Circuit Malfunction


Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1620/21 Driver Side - Side Airbag Sensor Circuit Malfunction


INSPECTION PROCEDURE

1.CHECK FOR DTC

  1. Turn the ignition switch to ON, and wait for at least 60 seconds.

  1. Clear the DTCs stored in the memory (YARIS_NCP93 RM000000XFE0D2X.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON, and wait for at least 60 seconds.

  1. Check for DTCs (YARIS_NCP93 RM000000XFE0D2X.html).

    Result:
    Result
    		Proceed to
    DTC B1620/21, B1622/81, B1625/22 and B1627/82 are not output
    		A
    DTC B1620/21 or B1622/81 is output
    		B
    DTC B1625/22 or B1627/82 is output
    		C
    HINT:
    Codes other than DTC B1620/21, B1622/81, B1625/22 and B1627/82 may be output at this time, but they are not related to this check.


A
USE SIMULATION METHOD TO CHECK

B
Go to step 3
C


2.CHECK SIDE AIRBAG SENSOR RH
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1620/21 Driver Side - Side Airbag Sensor Circuit Malfunction

  1. Turn the ignition switch off.

  1. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

  1. Interchange the side airbag sensor RH with LH and connect the connectors to them.

  1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

  1. Turn the ignition switch to ON, and wait for at least 60 seconds.

  1. Clear the DTCs stored in the memory (YARIS_NCP93 RM000000XFE0D2X.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON, wait for at least 60 seconds.

  1. Check for DTCs (YARIS_NCP93 RM000000XFE0D2X.html).

    Result:
    Result
    		Proceed to
    DTC B1620/21, B1622/81, B1625/22 and B1627/82 are not output
    		A
    DTC B1625/22 or B1627/82 is output
    		B
    DTC B1620/21 or B1622/81 is output
    		C
    HINT:
    Codes other than DTC B1620/21, B1622/81, B1625/22 and B1627/82 may be output at this time, but they are not related to this check.

  1. Turn the ignition switch off.

  1. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

  1. Return the side airbag sensor RH and LH to their original positions and connect the connectors to them.



A
USE SIMULATION METHOD TO CHECK

B
REPLACE CENTER AIRBAG SENSOR ASSEMBLY
C

REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH

3.CHECK SIDE AIRBAG SENSOR LH
Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B1620/21 Driver Side - Side Airbag Sensor Circuit Malfunction

  1. Turn the ignition switch off.

  1. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

  1. Interchange the side airbag sensor LH with RH and connect the connectors to them.

  1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

  1. Turn the ignition switch to ON, and wait for at least 60 seconds.

  1. Clear the DTCs stored in the memory (YARIS_NCP93 RM000000XFE0D2X.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON, wait for at least 60 seconds.

  1. Check for DTCs (YARIS_NCP93 RM000000XFE0D2X.html).

    Result:
    Result
    		Proceed to
    DTC B1620/21, B1622/81, B1625/22 and B1627/82 are not output
    		A
    DTC B1625/22 or B1627/82 is output
    		B
    DTC B1620/21 or B1622/81 is output
    		C
    HINT:
    Codes other than DTC B1620/21, B1622/81, B1625/22 and B1627/82 may be output at this time, but they are not related to this check.

  1. Turn the ignition switch off.

  1. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

  1. Return the side airbag sensor LH and RH to their original positions and connect the connectors to them.



A
USE SIMULATION METHOD TO CHECK

B
REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH
C

REPLACE CENTER AIRBAG SENSOR ASSEMBLY