DTC B1620/21: Driver Side - Side Airbag Sensor Malfunction: Procedure

CHECK DTC
1. Turn the ignition switch on (IG), and wait for at least 60 seconds.
  
  Fig 1: Identifying DLC3 Connector Terminal Identification
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR .
3. Turn the ignition switch off.
4. Turn the ignition switch on (IG), and wait for at least 60 seconds.
5. Check the DTCs. Refer to DTC CHECK / CLEAR .
  OK
  
  DTC B1620/21 is not output.
  
  HINT:
  
  Codes other than DTC B1620/21 may be output at this time, but they are not related to this check.
OK → See step 4

NG: Go to next step

CHECK SIDE AIRBAG SENSOR LH

Turn the ignition switch off.

Fig 2: Identifying Side Airbag Sensor LH Connector Terminal Identification
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
Interchange the side airbag sensor RH with LH and connect the connectors to them.
Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
Turn the ignition switch on (IG), and wait for at least 60 seconds.
Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR .
Turn the ignition switch off.
Turn the ignition switch on (IG), and wait for at least 60 seconds.

Check the DTCs. Refer to DTC CHECK / CLEAR .

Result

Result	Proceed to
DTC B1620/21 is output.	A
DTC B1625/22 is output.	B
DTC B1620/21 and B1625/22 are not output.	C

HINT:

Codes other than DTC B1620/21 and B1625/22 may be output at this time, but they are not related to this check.

A → See step 3

B → See step 6

C → See step 4

CHECK CENTER AIRBAG SENSOR ASSEMBLY
1. Turn the ignition switch off.
  
  Fig 3: Identifying DLC3 Connector Terminal Identification
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Return the side airbag sensor RH and LH to their original positions and connect the connectors to them.
4. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
5. Turn the ignition switch on (IG), and wait for at least 60 seconds.
6. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR .
7. Turn the ignition switch off.
8. Turn the ignition switch on (IG), and wait for at least 60 seconds.
9. Check the DTCs. Refer to DTC CHECK / CLEAR .
  OK
  
  DTC B1620/21 is not output.
  
  HINT:
  
  Codes other than DTC B1620/21 may be output at this time, but they are not related to this check.
NG → See step 5

OK → See step 4
USE SIMULATION METHOD TO CHECK. Refer to DIAGNOSIS SYSTEM
REPLACE CENTER AIRBAG SENOR ASSEMBLY. Refer to REMOVAL
REPLACE SIDE AIRBAG SENSOR LH. Refer to REMOVAL