Dtc B1797 Calibration Malfunction

Vehicle Interior. Corolla. Zre142 Aze141
Supplemental Restraint Systems. Corolla. Zre142 Aze141

DESCRIPTION

INSPECTION PROCEDURE

CHECK FOR DTC

READ VALUE USING DATA LIST (SPECIFIED CONDITION FOR ZERO POINT CALIBRATION)

CHECK FOR DTC

PERFORM ZERO POINT CALIBRATION

CHECK FOR DTC

REPLACE OCCUPANT CLASSIFICATION SENSOR (FRONT SEAT CUSHION ASSEMBLY)

PERFORM ZERO POINT CALIBRATION

CHECK FOR DTC

PERFORM SENSITIVITY CHECK

DTC B1797 Calibration Malfunction


DESCRIPTION

DTC B1797 is output when the following conditions are met:
  1. Zero point calibration is performed when the conditions for the calibration are not satisfied.
  1. Zero point calibration has failed.

Condition for the Zero Point Calibration
Item
Condition
DTC
Not recorded
Front passenger seat occupant
Vacant
Front passenger side buckle switch
OFF (The seat belt is not fastened)
ECU temperature
0 to 46°C (32 to 114.8°F)
Filtered pressure
38 to 75 count

DTC No.
DTC Detecting Condition
Trouble Area
B1797
  1. Zero point calibration is performed when the conditions for the calibration are not satisfied.
  2. Zero point calibration has failed.
  1. There is no malfunction if this DTC is not output again after performing occupant classification system zero point calibration.
  2. Occupant classification sensor
  3. Occupant classification ECU
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

1.CHECK FOR DTC

  1. Turn the ignition switch to ON.

  1. Clear the DTCs stored in the occupant classification ECU (COROLLA_ZRE142 RM0000010VK07TX.html).

  1. Clear the DTCs stored in the center airbag sensor assembly (COROLLA_ZRE142 RM000000XFE0H1X.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON, and wait for at least 10 seconds.

  1. Check for DTCs (COROLLA_ZRE142 RM0000010VK07TX.html).

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


NG
Go to step 2
OK

PERFORM ZERO POINT CALIBRATION (COROLLA_ZRE142 RM0000010VN07SX.html)

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

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Using the Techstream, read the Data List (COROLLA_ZRE142 RM0000010VM07SX.html).


Tester Display
Measurement Item/Range
Normal Condition
Specified Condition for Zero Point Calibration
Pressure Sensor Output
Pressure sensor output/
Min.: 0
Max.: 255
0 to 210
(reference value)
0 to 2
Thermistor Temperature Output
Thermistor temperature output/
Min.: -40°C (-40°F)
Max.: 90°C (194°F)
-40 to 85°C
(-40 to 185°F)
3 to 40°C
(37 to 104°F)
Number of Present DTC
Number of present trouble codes/
Min.: 0
Max.: 255
0
0
Number of Past DTC
Number of past trouble codes/
Min.: 0
Max.: 255
0
0

Result:

Result
Proceed to
All items correspond to the range of specified condition for zero point calibration.
A
THERMISTOR TEMP does not correspond to the range of specified condition for zero point calibration.
B


B
Go to step 6
A


3.CHECK FOR DTC
HINT:
Check that the zero point calibration is completed normally. If any of the following conditions is met, DTC B1797 will be output (Refer to Initialization: COROLLA_ZRE142 RM0000010VN07SX.html).

  1. Clear the DTCs stored in the center airbag sensor assembly (COROLLA_ZRE142 RM000000XFE0H1X.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON.

  1. Check for DTCs (COROLLA_ZRE142 RM0000010VK07TX.html).

    OK:
    DTC B1797 is not output.

NEXT


4.PERFORM ZERO POINT CALIBRATION

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Using the Techstream, perform the zero point calibration (COROLLA_ZRE142 RM0000010VN07SX.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON.

  1. Clear the DTCs stored in the memory (COROLLA_ZRE142 RM0000010VK07TX.html).

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

NEXT


5.CHECK FOR DTC

  1. Turn the ignition switch to ON.

  1. Clear the DTCs stored in the occupant classification ECU (COROLLA_ZRE142 RM0000010VK07TX.html).

  1. Clear the DTCs stored in the center airbag sensor assembly (COROLLA_ZRE142 RM000000XFE0H1X.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON.

  1. Check for DTCs (COROLLA_ZRE142 RM0000010VK07TX.html).

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

NEXT

END

6.REPLACE OCCUPANT CLASSIFICATION SENSOR (FRONT SEAT CUSHION ASSEMBLY)

  1. Turn the ignition switch off.

  1. Disconnect the cable from the negative (-) battery terminal.

  1. Replace the front seat cushion assembly (with occupant classification ECU and occupant classification sensor) (COROLLA_ZRE142 RM000001Q5I017X.html).

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

  1. Turn the ignition switch to ON.

  1. Clear the DTCs stored in the occupant classification ECU (COROLLA_ZRE142 RM0000010VK07TX.html).

  1. Clear the DTCs stored in the center airbag sensor assembly (COROLLA_ZRE142 RM000000XFE0H1X.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON.

  1. Using the Techstream, check for occupant classification ECU DTCs (COROLLA_ZRE142 RM0000010VK07TX.html).

    OK:
    DTC is not output.

NEXT


7.PERFORM ZERO POINT CALIBRATION

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Using the Techstream, perform the zero point calibration (COROLLA_ZRE142 RM0000010VN07SX.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON.

  1. Clear the DTCs stored in the occupant classification ECU (COROLLA_ZRE142 RM0000010VK07TX.html).

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

NEXT


8.CHECK FOR DTC

  1. Turn the ignition switch to ON.

  1. Clear the DTCs stored in the occupant classification ECU (COROLLA_ZRE142 RM0000010VK07TX.html).

  1. Clear the DTCs stored in the center airbag sensor assembly (COROLLA_ZRE142 RM000000XFE0H1X.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON.

  1. Check for DTCs (COROLLA_ZRE142 RM0000010VK07TX.html).

    OK:
    DTC B1797 is not output.

NEXT


9.PERFORM SENSITIVITY CHECK

  1. Perform the sensitivity check (COROLLA_ZRE142 RM0000010VN07SX.html).


NEXT

END