B1797: Calibration Malfunction: Description

WARNING: This page is about a different car, the 2007 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

DTC B1797 is output when either of the following occurs:

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:

CONDITION FOR THE ZERO POINT CALIBRATION

Item	Condition
DTC	Not recorded
Front passenger seat	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

DIAGNOSTIC TROUBLE CODE TABLE

DTC No.	DTC Detection Condition	Trouble Area
B1797	When one of following conditions met: Zero point calibration is performed when the conditions for the calibration are not satisfied. Zero point calibration has failed.	There is no malfunction if this DTC is not output again after performing occupant classification system zero point calibration. Front seat cushion assembly (Occupant classification sensor)

NOTE: Replace the occupant classification ECU, occupant classification sensor, seat cushion cover pad, seat cushion cover and seat cushion seat heater as a 5 part set (see supply set part no.).

HINT:

When DTC B1650/32 is detected as a result of troubleshooting for the supplemental restraint system, check the DTCs stored in the occupant classification ECU. When DTC B1797 is output, perform troubleshooting for the DTC.
Use the intelligent tester to check for DTCs of the occupant classification ECU, otherwise the DTC cannot be read.