VIDEO

Informace

Buick

Buick P1661

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 P1661

Basic error definition

CABIN HEATER 3 CONTROL - CIRCUIT SHORT TO GROUND OR OPEN

Cause of DTC

Three Positive Temperature Coefficient (PTC) Relays, located in the Power Distribution Center (PDC) Assembly, are used for the PTC Cabin Heater System. The PTC Relays are used to supply fused battery voltage directly to the heating elements of the Cabin Heater. When the Body Control Module (BCM) receives a PTC Cabin Heater System activation CAN Bus message from the Powertrain Control Module (PCM), the BCM provides a ground signal, through the PTC Relay Control circuits, to activate the PTC Relays. When the PTC Relays are activated, a voltage output is sent to the Cabin Heater through the Fused Cabin Heater Supply circuits.