B1797

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

DTC 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.

Conditions 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

PROCEDURE

1. CHECK FOR DTC
(a) Turn the ignition switch to ON.
(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 ignition switch to OFF.
(e) Turn the ignition switch to ON, 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
2. READ VALUE USING TECHSTREAM (SPECIFIED CONDITION FOR ZERO POINT CALIBRATION)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Using the Techstream, read the "DATA LIST" or "Data List" Scan Tool Testing and Procedures.

Occupant Detection:





Result





B -- PERFORM REGISTRATION BEFORE ECU EXCHANGE
A -- Continue to next step.
3. PERFORM ZERO POINT CALIBRATION
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Using the Techstream, perform zero point calibration Initialization.
NEXT -- Continue to next step.
4. CHECK FOR DTC
(a) Turn the ignition switch to ON.
(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 ignition switch to OFF.
(e) Turn the ignition switch to ON.
(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 -- PERFORM REGISTRATION BEFORE ECU EXCHANGE
OK -- END
5. PERFORM REGISTRATION BEFORE ECU EXCHANGE
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Using the Techstream, save the ECU data from the ECU which was installed on the vehicle Registration.
NEXT -- Continue to next step.
6. REPLACE FRONT SEAT CUSHION (OCCUPANT DETECTION SENSOR)
(a) Turn the ignition switch to OFF.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Replace the front seat cushion (with occupant classification ECU and occupant detection sensor) Removal.
(d) Connect the negative (-) terminal cable to the battery.
NEXT -- Continue to next step.
7. PERFORM REGISTRATION AFTER ECU EXCHANGE
(a) Turn the ignition switch to ON.
(b) Using the Techstream, load the previous ECU data stored in the tester into the new ECU Registration.
NEXT -- Continue to next step.
8. PERFORM ZERO POINT CALIBRATION
(a) Using the Techstream, perform zero point calibration Initialization.
(b) Turn the ignition switch to OFF.
(c) Turn the ignition switch to ON.
(d) 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.
9. PERFORM SENSITIVITY CHECK
(a) Perform the sensitivity check Initialization.
NEXT -- END