RX400h · Service Manual RESTRAINTS

B1154/38

Diagnostic trouble codes

DESCRIPTION

The rear airbag sensor RH circuit consists of the safing sensor, the diagnostic circuit and the lateral deceleration sensor, etc. If the center airbag sensor assembly receives signals from the lateral deceleration sensor, it judges whether or not the SRS should be activated. DTC B1154/38 is recorded when a malfunction in the rear airbag sensor RH circuit is detected.
DTC No.
 DTC Detecting Condition
 Trouble Area
B1154/38
  1. Short in rear airbag sensor RH circuit (to ground)
  2. Short in rear airbag sensor RH circuit (to B+)
  3. Open in rear airbag sensor RH circuit
  4. Rear airbag sensor RH malfunction
  5. Center airbag sensor assembly malfunction
  1. Rear airbag sensor RH
  2. Center airbag sensor assembly
  3. Floor wire

WIRING DIAGRAM

H043054E11

INSPECTION PROCEDURE


1. CHECK DTC

  1. C111661E01
    Turn the ignition switch to the ON position, and wait for at least 60 seconds.

  1. Clear the DTCs stored in memory (Click here).

  1. Turn the ignition switch to the LOCK position.

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

  1. Check the DTCs (Click here).

    OK:
    DTC B1154/38 is not output.

    HINT:
    Codes other than code B1154/38 may be output at this time, but they are not related to this check.



 NG
Go to step 2
OK

USE SIMULATION METHOD TO CHECK

2. CHECK CONNECTION OF CONNECTORS

  1. Turn the ignition switch to the LOCK position.

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

  1. Check that the connectors are properly connected to the center airbag sensor assembly and the rear airbag sensor RH.

    OK:
    The connectors are connected.



 NG
CONNECT CONNECTORS, THEN GO TO STEP 1
OK


3. CHECK FLOOR WIRE (OPEN)

  1. C111713E03
    Disconnect the connectors from the center airbag sensor assembly and the rear airbag sensor RH.

  1. Using a service wire, connect A25-19 (VUCR) and A25-20 (ESCR) of connector "B".

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

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

    Resistance:
    Tester connection
    		 Condition
    		 Specified condition
    S24-4 (VUCR) -
    S24-1 (ESCR)
    		 Always
    		 Below 1 Ω

  1. Using a service wire, connect A25-18 (CSR+) and A25-4 (CSR-) of connector "B".

    CAUTION:
    C111714E03
    Do not forcibly insert a service wire into the terminals of the connector when connecting.

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

    Resistance:
    Tester connection
    		 Condition
    		 Specified condition
    S24-3 (CSR+) -
    S24-2 (CSR-)
    		 Always
    		 Below 1 Ω



NG
REPAIR OR REPLACE FLOOR WIRE
OK


4. CHECK FLOOR WIRE (SHORT TO B+)

  1. C109485E03
    Disconnect the service wire from connector "B".

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

  1. Turn the ignition switch to the ON position.

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

    Voltage:
    Tester connection
    		 Condition
    		 Specified condition
    S24-4 (VUCR) -
    Body ground
    		 Ignition switch ON
    		 Below 1 V
    S24-1 (ESCR) -
    Body ground
    		 Ignition switch ON
    		 Below 1 V
    S24-3 (CSR+) -
    Body ground
    		 Ignition switch ON
    		 Below 1 V
    S24-2 (CSR-) -
    Body ground
    		 Ignition switch ON
    		 Below 1 V



NG
REPAIR OR REPLACE FLOOR WIRE
OK


5. CHECK FLOOR WIRE (SHORT TO GROUND)

  1. C109485E03
    Turn the ignition switch to the LOCK position.

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

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

    Resistance:
    Tester connection
    		 Condition
    		 Specified condition
    S24-4 (VUCR) -
    Body ground
    		 Always
    		 1 MΩ or higher
    S24-1 (ESCR) -
    Body ground
    		 Always
    		 1 MΩ or higher
    S24-3 (CSR+) -
    Body ground
    		 Always
    		 1 MΩ or higher
    S24-2 (CSR-) -
    Body ground
    		 Always
    		 1 MΩ or higher



NG
REPAIR OR REPLACE FLOOR WIRE
OK


6. CHECK REAR AIRBAG SENSOR RH

  1. C111662E01
    Connect the connector to the center airbag sensor assembly.

  1. Interchange the rear 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 the ON position, and wait for at least 60 seconds.

  1. Clear the DTCs stored in memory (Click here).

  1. Turn the ignition switch to the LOCK position.

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

  1. Check the DTCs (Click here).

    Result:
    Proceed To
    		 Display (DTC Output)
    NG: A
    		 DTC B1154/38 is output.
    NG: B
    		 DTC B1155/39 is output.
    OK
    		 DTC B1154/38 and B1155/39 are not output.



NG:A
REPLACE CENTER AIRBAG SENSOR

NG:B
REPLACE REAR AIRBAG SENSOR RH
OK

USE SIMULATION METHOD TO CHECK


← B1153/25B1155/39 →