Toyota Sienna Service Manual: Passenger Airbag ON/OFF Indicator Circuit Malfunction

DTC B1152/28 Passenger Airbag ON/OFF Indicator Circuit Malfunction

DESCRIPTION

The passenger airbag ON/OFF indicator circuit consists of the center airbag sensor assembly and passenger airbag ON/OFF indicator.

This circuit indicates the operation condition of the front passenger airbag, the front seat side airbag RH and front seat belt pretensioner RH.

DTC B1152/28 is recorded when a malfunction is detected in the passenger airbag ON/OFF indicator circuit.

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK PASSENGER AIRBAG ON/OFF INDICATOR OPERATION

1. Turn the ignition switch to the ON position.
2.  Check the passenger airbag ON/OFF indicator operation.

HINT: Refer to the normal condition of the passenger airbag ON/OFF indicator (

Result

Go to step 10

2 CHECK CONNECTION OF CONNECTORS

1. Turn the ignition switch to the LOCK position.
2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3.  Check that the connectors are properly connected to the center airbag sensor assembly and the air conditioning control assembly.

OK: The connectors are connected.

CONNECT CONNECTORS

3 CHECK CONNECTORS

1. Disconnect the connectors from the center airbag sensor assembly and the air conditioning control assembly.
2. Check that the connectors (on the center airbag sensor assembly side and the air conditioning control assembly side) are not damaged.

OK: The connectors are not deformed or damaged.

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

4 CHECK PASSENGER AIRBAG ON/OFF INDICATOR

1. Connect the connector to the center airbag sensor assembly.
2.  Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
3.  Turn the ignition switch to the ON position.
4.  Check the passenger airbag ON/OFF indicator operation.

OK: The passenger airbag ON/OFF indicator ("ON" and "OFF") does not come on.

Go to step 6

5 CHECK CENTER AIRBAG SENSOR ASSEMBLY

1. Turn the ignition switch to the LOCK position.
2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Connect the connector to the air conditioning control assembly.
4.  Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
5.  Turn the ignition switch to the ON position, and wait for at least 60 seconds.
6.  Clear the DTCs stored in memory (5).
7.  Turn the ignition switch to the LOCK position.
8.  Turn the ignition switch to the ON position, and wait for at least 60 seconds.
9.  Check the DTCs (5).

OK: DTC B1152/28 is not output.

HINT: Codes other than code B1152/28 may be output at this time, but they are not related to this check.

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

USE SIMULATION METHOD TO CHECK

6 CHECK INSTRUMENT PANEL WIRE (OPEN)

1. Turn the ignition switch to the LOCK position.
2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3.  Disconnect the connector from the center airbag sensor assembly.
4.  Using a service wire, connect A21-1 (P-AB) and A21-25 (PAON) of connector "B".

   NOTICE: Do not forcibly insert a service wire into the terminals of the connector when connecting.

5.  Measure the resistance according to the value(s) in the table below.

Automatic air conditioning: Standard resistance

Manual air conditioning: Standard resistance

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

7 CHECK INSTRUMENT PANEL WIRE (SHORT)

1. Disconnect the service wire from connector "B".
2.  Measure the resistance according to the value(s) in the table below.

Automatic air conditioning: Standard resistance

Manual air conditioning: Standard resistance

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

8 CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)

1. Measure the resistance according to the value(s) in the table below.

Automatic air conditioning: Standard resistance

Manual air conditioning: Standard resistance

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

9 CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)

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

Automatic air conditioning: Standard voltage

Manual air conditioning: Standard voltage

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

10 CHECK CONNECTION OF CONNECTORS

1. Turn the ignition switch to the LOCK position.
2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3.  Check that the connectors are properly connected to the center airbag sensor assembly and the air conditioning control assembly.

OK: The connectors are connected.

CONNECT CONNECTORS

11 CHECK CONNECTORS

1. Disconnect the connectors from the center airbag sensor assembly and the air conditioning control assembly.
2.  Check that the connectors (on the center airbag sensor assembly side and the air conditioning control assembly side) are not damaged.

OK: The connectors are not deformed or damaged.

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

12 CHECK INSTRUMENT PANEL WIRE (OPEN)

1. Using a service wire, connect A21-1 (ABON) and A21-25 (ABOF) of connector "B".
2.  Measure the resistance according to the value(s) in the table below.

Automatic air conditioning: Standard resistance

Manual air conditioning: Standard resistance

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

13 CHECK INSTRUMENT PANEL WIRE (SHORT)

1. Disconnect the service wire from connector "B".
2.  Measure the resistance according to the value(s) in the table below.

Automatic air conditioning: Standard resistance

Manual air conditioning: Standard resistance

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

14 CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)

1. Measure the resistance according to the value(s) in the table below.

Automatic air conditioning: Standard resistance

Manual air conditioning: Standard resistance

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

15 CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)

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

Automatic air conditioning: Standard voltage

Manual air conditioning: Standard voltage

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

16 CHECK WIRE HARNESS (POWER SOURCE)

1. Turn the ignition switch to the LOCK position.
2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3.  Connect the connector to the center airbag sensor assembly.
4.  Turn the ignition switch to the ON position.
5.  Measure the voltage and resistance according to the value(s) in the table below.

Automatic air conditioning: Standard voltage

Manual air conditioning: Standard voltage

REPAIR OR REPLACE POWER SOURCE CIRCUIT

17 CHECK PASSENGER AIRBAG ON/OFF INDICATOR

1. Turn the ignition switch to the LOCK position.
2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3.  Connect the connector to the air conditioning control assembly.
4.  Disconnect the connector from center airbag sensor assembly.
5.  Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
6.  Turn the ignition switch to the ON position.
7.  Check the passenger airbag ON/OFF indicator condition.

Result

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

18 CHECK CENTER AIRBAG SENSOR ASSEMBLY

1. Turn the ignition switch to the LOCK position.
2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3.  Connect the connector to the center airbag sensor assembly.
4.  Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
5.  Turn the ignition switch to the ON position, and wait for at least 60 seconds.
6.  Clear the DTCs stored in memory (5).
7. Turn the ignition switch to the LOCK position.
8.  Turn the ignition switch to the ON position, and wait for at least 60 seconds.
9.  Check the DTCs (5).

OK: DTC B1152/28 is not output.

HINT: Codes other than code B1152/28 may be output at this time, but they are not related to this check.

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

USE SIMULATION METHOD TO CHECK