B1797

SUPPLEMENTAL RESTRAINT SYSTEM: OCCUPANT CLASSIFICATION SYSTEM: B1797: Calibration Malfunction
B1797 - Calibration Malfunction

DESCRIPTION

DTC B1797 is output when one of the following conditions is met:

* Zero point calibration is performed when the conditions for the calibration are not satisfied.

* Zero point calibration has failed.

Condition for the zero point calibration:









HINT
When DTC B1650/32 is detected as a result of troubleshooting for the AIRBAG SYSTEM, check the DTCs stored in the occupant classification ECU. When DTC B1797 is output, perform troubleshooting for the DTC.

INSPECTION PROCEDURE

NOTICE:
* w/ Navigation System (for HDD):
After the power switch is turned off, the display and navigation module display (HDD navigation system) records various types of memory and settings. As a result, after turning the power 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, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

PROCEDURE

1. CHECK FOR DTC

(a) Turn the power switch ON (IG).

(b) Clear the DTCs stored in the occupant classification ECU Reading and Clearing Diagnostic Trouble Codes.

(c) Clear the DTCs stored in the center airbag sensor DTC Check / Clear.

(d) Turn the power switch OFF.

(e) Turn the power switch ON (IG), and wait for at least 10 seconds.

(f) Check for the DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B1797 is not output.

HINT
Codes other than DTC B1797 may be output at this time, but they are not related to this check.

NG -- READ VALUE USING TECHSTREAM (SPECIFIED CONDITION FOR ZERO POINT CALIBRATION)

OK -- USE SIMULATION METHOD TO CHECK Diagnosis System

2. READ VALUE USING TECHSTREAM (SPECIFIED CONDITION FOR ZERO POINT CALIBRATION)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch ON (IG).

(c) Using the Techstream, read the "Data List" Scan Tool Testing and Procedures.

Occupant Detection:





Result





B -- REPLACE FRONT SEAT SET (OCCUPANT DETECTION SENSOR)
A -- Continue to next step.

3. PERFORM ZERO POINT CALIBRATION

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch ON (IG).

(c) Using the Techstream, perform zero point calibration Initialization.

(d) Turn the power switch OFF.

(e) Turn the power switch ON (IG).

(f) Clear the DTCs stored in the memory Reading and Clearing Diagnostic Trouble Codes.

HINT
If the DTCs are not cleared at this time, past DTCs will remain.

NEXT -- Continue to next step.

4. CHECK FOR DTC

(a) Turn the power switch ON (IG).

(b) Clear the DTCs stored in the occupant classification ECU Reading and Clearing Diagnostic Trouble Codes.

(c) Clear the DTCs stored in the center airbag sensor DTC Check / Clear.

(d) Turn the power switch OFF.

(e) Turn the power switch ON (IG).

(f) Check for the DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B1797 is not output.

HINT
Codes other than DTC B1797 may be output at this time, but they are not related to this check.

NG -- REPLACE FRONT SEAT SET (OCCUPANT DETECTION SENSOR)

OK -- END

5. REPLACE FRONT SEAT SET (OCCUPANT DETECTION SENSOR)

(a) Turn the power switch OFF.

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

(c) Replace the front seat set (with occupant classification ECU and occupant detection sensor) Disassembly.

(d) Connect the negative (-) terminal cable to the battery.

(e) Turn the power switch ON (IG).

(f) Clear the DTCs stored in the occupant classification ECU Reading and Clearing Diagnostic Trouble Codes.

(g) Clear the DTCs stored in the center airbag sensor DTC Check / Clear.

NEXT -- Continue to next step.

6. PERFORM ZERO POINT CALIBRATION

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch ON (IG).

(c) Using the Techstream, perform zero point calibration Initialization.

(d) Turn the power switch OFF.

(e) Turn the power switch ON (IG).

(f) Clear the DTCs stored in the occupant classification ECU Reading and Clearing Diagnostic Trouble Codes.

HINT
If the DTCs are not cleared at this time, past DTCs will remain.

NEXT -- Continue to next step.

7. PERFORM SENSITIVITY CHECK

(a) Perform the sensitivity check Initialization.

NEXT -- END