DESCRIPTION The occupant detection sensor power supply circuit consists of the occupant classification ECU and the occupant detection sensors. DTC B1793 is set when a malfunction is detected in the occupant detection sensor power supply circuit.
HINT:
WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE:
HINT:
PROCEDURE
(a) Turn the ignition switch to ON, and wait for at least 60 seconds. (b) Clear any DTCs stored in the memory (see page ). HINT:
(c) Turn the ignition switch off. (d) Turn the ignition switch to ON, and wait for at least 60 seconds. (e) Using the Techstream, check for DTCs of the occupant classification ECU (see page ). OK: DTC B1793 is not output. HINT: DTCs other than DTC B1793 may be output at this time, but they are not related to this check.
(a) Turn the ignition switch off. (b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds. (c) Check that the connectors are properly connected to the occupant classification ECU and the occupant detection sensors. OK: Connectors are properly connected.
(a) Check that the connectors (on the occupant classification ECU side and the occupant detection sensors side) are not damaged (see page ). OK: Connectors are not deformed or damaged.
(a) Disconnect the connectors from the occupant classification ECU and the 4 occupant detection sensors. (b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds. (c) Turn the ignition switch to ON, and wait for at least 60 seconds. (d) Measure the voltage according to the value(s) in the table below. Standard voltage:
(e) Turn the ignition switch off. (f) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds. (g) Measure the resistance according to the value(s) in the table below. Standard resistance:
(h) Measure the resistance according the value(s) in the table below. Standard resistance:
(a) Connect the connectors to the occupant classification ECU and the 4 occupant detection sensors. (b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds. (c) Turn the ignition switch to ON, and wait for at least 60 seconds. (d) Clear any DTCs stored in the memory (see page ). HINT:
(e) Turn the ignition switch off. (f) Turn the ignition switch to ON, and wait for at least 60 seconds. (g) Using the Techstream, check for DTCs of the occupant classification ECU (see page ). OK: DTC B1793 is not output. HINT: DTCs other than DTC B1793 may be output at this time, but they are not related to this check.
(a) Turn the ignition switch off. (b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds. (c) Replace the occupant classification ECU.
HINT: Perform the inspection using parts from a normal vehicle when possible.
(a) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds. (b) Connect the Techstream to the DLC3. (c) Turn the ignition switch to ON, and wait for at least 60 seconds. (d) Using the Techstream, perform the zero point calibration (see page ).
(a) Using the Techstream, perform the sensitivity check (see page ). Standard range: 27 to 33 kg (59.5 to 72.8 lb)
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