DTC 38

SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1656/38: Seat Belt Buckle Switch LH Circuit Malfunction
B1656/38 - Seat Belt Buckle Switch LH Circuit Malfunction

DESCRIPTION

The seat belt buckle switch LH circuit consists of the center airbag sensor and front seat inner belt LH.

DTC B1656/37 is stored when a malfunction is detected in the seat belt buckle switch LH circuit.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* W/ Navigation System:
* After the engine switch is turned off, the display and navigation module display (navigation system) records various types of memory and settings. As a result, after turning the engine switch off, be sure to wait for the time specified in the following table before disconnecting the cable from the negative (-) battery terminal.

Waiting Time before Disconnecting Cable from Negative (-) Battery Terminal:





* When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.
PROCEDURE

1. CHECK FOR DTC

(a) Turn the engine switch on (IG).

(b) Clear the DTCs DTC Check / Clear.

(c) Turn the engine switch off.

(d) Turn the engine switch on (IG), and wait for at least 60 seconds.

(e) Check for DTCs DTC Check / Clear.

OK:

DTC B1656 is not output.

HINT
Codes other than DTC B1656 may be output at this time, but they are not related to this check.

NG -- CHECK CONNECTION OF CONNECTORS

OK -- USE SIMULATION METHOD TO CHECK Diagnosis System

2. CHECK CONNECTION OF CONNECTORS

(a) Turn the engine switch off.

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

(c) Check that the connectors are properly connected to the center airbag sensor and front seat inner belt LH.

OK:

The connectors are properly connected.

NG -- CONNECT CONNECTORS PROPERLY
OK -- Continue to next step.

3. CHECK CONNECTORS

(a) Disconnect the connectors from the center airbag sensor and front seat inner belt LH.

(b) Check that the connectors (on the center airbag sensor side and front seat inner belt LH side) are not damaged.

OK:

The connectors are not deformed or damaged.





Text in Illustration





NG -- REPLACE NO. 2 FLOOR WIRE
OK -- Continue to next step.

4. CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR - FRONT SEAT INNER BELT LH)

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





Text in Illustration





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

Standard Voltage:





(c) Turn the engine switch off.

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

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

Standard Resistance:





NG -- REPLACE NO. 2 FLOOR WIRE
OK -- Continue to next step.

5. CHECK FRONT SEAT INNER BELT LH (SEAT BELT BUCKLE SWITCH)

(a) Connect the connectors to the center airbag sensor and front seat inner belt LH.





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

(c) Turn the engine switch on (IG), and wait for at least 60 seconds.

(d) Clear the DTCs DTC Check / Clear.

(e) Turn the engine switch off.

(f) Turn the engine switch on (IG), and wait for at least 60 seconds.

(g) Check for DTCs DTC Check / Clear.

OK:

DTC B1656 is not output.

HINT
Codes other than DTC B1656 may be output at this time, but they are not related to this check.

Text in Illustration





NG -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH

OK -- USE SIMULATION METHOD TO CHECK Diagnosis System

6. REPLACE FRONT SEAT INNER BELT ASSEMBLY LH

(a) Turn the engine switch off.

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

(c) Replace the front seat inner belt LH Removal.

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

NEXT -- Continue to next step.

7. CHECK CENTER AIRBAG SENSOR

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





(b) Turn the engine switch on (IG), and wait for at least 60 seconds.

(c) Clear the DTCs DTC Check / Clear.

(d) Turn the engine switch off.

(e) Turn the engine switch on (IG), and wait for at least 60 seconds.

(f) Check for DTCs DTC Check / Clear.

OK:

DTC B1656 is not output.

HINT
Codes other than DTC B1656 may be output at this time, but they are not related to this check.

Text in Illustration





NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

OK -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Removal