VIDEO

Informace

Buick

Buick P1381

See the basic definition of a diagnostic error. This will help you to clarify the main causes of the fault code. You will understand the program of the control unit
Basic DTC analysis according to OBD2 protocol standard.

OBD2 or On-Board Diagnostics displays messages for basic group styles. More comprehensible code composition has been standard since 2000. The DTC code consists of five characters and its composition will be shown in this video

Insight into programming

The basic unit for the operation of any computer is the bit. Logic 0 and 1 are expressed by a single bit. Diagnostics The error code is composed of 16 bits. The first two bits define one of the four basic circuits. The video will show you a comprehensive overview of the composition of the error report

A diagnostically understandable description of the Diagnostic Trouble Code

Buick P1381

Basic error definition

Occupant Classification-ECU Time-Out

Cause of DTC

The A C-ECU receives the air conditioning control-related signals from the occupant classification-ECU via the CAN bus lines. If any of the air conditioning control-related signals from the occupant classification-ECU cannot be received, the diagnostic trouble code U0154 is stored. Current trouble: Connector(s) or wiring harness in the CAN bus lines between the Occupant classification-ECU and the A C-ECU, the power supply system to the Occupant classification-ECU, the Occupant classification-ECU itself, or the A C-ECU may be defective. Past trouble: If DTC U0154 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) in the CAN bus line between the A C-ECU and the Occupant classification-ECU, and the power supply system to the Occupant classification-ECU. If the connectors and wiring are normal, and obviously the ECU is the cause of the trouble, replace the ECU. If in doubt, do not replace the ECU.