Self Diagnostic Features

SELF DIAGNOSTIC FEATURES

SEGMENT CHECK
Segment check causes a total illumination of all segments and some bulbs on the IPC (turn signals will not light). This is helpful in determining if any bulbs or segments of the vacuum fluorescent display are out or always on.

TROUBLE CODES
In the process of controlling the various subsystems, the PCM, IPC, ACP, DERM, TCS, and RSS continually monitor operating conditions for possible system malfunctions. By comparing system conditions against standard operating limits, certain circuit and component malfunctions can be detected. A four digit alphanumerical "Trouble Code" is stored in computer memory when a problem is detected by this self-diagnostic system. These "Trouble Codes" can later be displayed by the service technician as an aid in system repair.

STATUS LIGHTS
While in Service Diagnostics, the mode indicators on the Climate Control Center (CCC) are used to indicate the status of certain operating modes. The different modes of operation are indicated by the status light being turned "ON" or turned "OFF".

SYSTEM TESTS
System Tests allow for the display of values as actually seen or commanded by the various Systems (i.e. PCM, IPC, ACP, DERM, TCS, or RSS).

The Test Types available are dependent on the System selected, but may include the following:
Data (Analog Inputs) - displays analog values as seen by the system
Inputs (Digital Inputs) - displays digital values as seen by the system and provides an indication of whether the input has cycled
Outputs (Digital Outputs) - cycles digital outputs controlled by the system off/on for 3 seconds each cycle
Overrides (Analog Outputs) - allows for analog outputs of the system to be set at a desired value
Clear Codes - will erase all codes stored for the component currently selected (Note: if the fault is present, the code may immediately reset).
Snapshot - stores all inputs (Analog and Digital) to a component at a particular moment (either when a code is set or when manually triggered). These values may then be reviewed.

How to access and utilize each of test types is explained in the next sections. The exact content of each system's diagnostic capabilities is covered in the particular system's diagnostic section.