DTC B1653/35: Seat Position Airbag Sensor Circuit Malfunction (08/2010 - 08/2011): Procedure

Fig 1: Identifying Seat Position Sensor And Center Airbag Sensor Circuit

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the engine switch on (IG).
2. Clear the DTCs. Refer to DTC CHECK / CLEAR .
3. Turn the engine switch off.
4. Turn the engine switch on (IG), and wait for at least 60 seconds.
5. Check for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1653 is not output.

   HINT: 

   Codes other than DTC B1653 may be output at this time, but they are not related to this check.

NG → See step   2 

OK → See step   8 

1. Turn the engine switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Check that the connectors are properly connected to the center airbag sensor and the seat position sensor.

   OK

   The connectors are properly connected.

NG → CONNECT CONNECTORS PROPERLY 

OK: Go to next step 

1. Disconnect the connectors from the center airbag sensor and the seat position sensor.
2. Check that the connectors (on the center airbag sensor side and seat position sensor side) are not damaged.

   OK

   The connectors are not deformed or damaged.

NG → REPLACE FLOOR WIRE 

OK: Go to next step 

Fig 2: Identifying Center Airbag Sensor K27 & Seat Position Sensor K10 Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   K10-4 (LSP+) - Body ground	Engine switch on (IG)	Below 1 V
   K10-8 (LSP-) - Body ground	Engine switch on (IG)	Below 1 V

3. Turn the engine switch off.
4. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
5. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K10-4 (LSP+) - K27-9 (LSP+)	Always	Below 1 Ω
   K10-4 (LSP+) - Body ground	Always	1 MΩ or higher
   K10-8 (LSP-) - Body ground	Always	Below 1 Ω

NG → REPLACE FLOOR WIRE 

OK: Go to next step 

Fig 3: Identifying Seat Position Sensor And Center Airbag Sensor Circuit

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Connect the connectors to the center airbag sensor and the seat position sensor.
2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
3. Turn the engine switch on (IG), and wait for at least 60 seconds.
4. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR .
5. Turn the engine switch off.
6. Turn the engine switch on (IG), and wait for at least 60 seconds.
7. Check for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1653 is not output.

   HINT: 

   Codes other than DTC B1653 may be output at this time, but they are not related to this check.

NG → See step   6 

OK → See step   9 

1. Turn the engine switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Replace the seat position sensor. Refer to REMOVAL .

   HINT: 

   Perform the inspection using parts from a normally functioning vehicle if possible.

NEXT: Go to next step 

Fig 4: Center Airbag Sensor - Communication Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
2. Turn the engine switch on (IG), and wait for at least 60 seconds.
3. Clear the DTCs. Refer to DTC CHECK / CLEAR .
4. Turn the engine switch off.
5. Turn the engine switch on (IG), and wait for at least 60 seconds.
6. Check for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1653 is not output.

   HINT: 

   Codes other than DTC B1653 may be output at this time, but they are not related to this check.

NG → See step   10 

OK → See step   11