General

The on-board diagnosis function of the cruise control system uses an external Subaru Select Monitor.

The on-board diagnosis function operates in two categories, which are used depending on the type of problems;

1. Cruise cancel conditions diagnosis
1. This category of diagnosis requires actual vehicle driving in order to determine the cause, (as when cruise speed is canceled during driving although cruise cancel condition is not entered).
2. Cruise control module memory stores the cancel condition (Code No.) which occurred during driving. When there are plural cancel conditions (Code No.), they are shown on the Subaru Select Monitor.

CAUTION:
- The cruise control memory stores not only the cruise "cancel" which occurred (although "cancel" operation is not entered by the driver), but also the "cancel" condition input by the driver.
- The content of memory is cleared when ignition switch or cruise main switch is turned OFF.

2. Real-time diagnosis
The real-time diagnosis function is used to determine whether or not the input signal system is in good order, according to signal emitted from switches, sensors, etc.
1. Vehicle cannot be driven at cruise speed because problem occurs in the cruise control system or its associated circuits.
2. Monitor the signal conditions from switches and sensors.