Preliminary Information

The cruise control module has a self-diagnostic capability. In conjunction with the cruise control switch, it can be used to run an abbreviated self-test which covers all of the switch signals and the Vehicle Speed Sensor (VSS) signal.

In addition to the abbreviated self-test, grounding the Tc terminal in the Data Link Connector (DLC) allows the cruise control module to flash Diagnostic Trouble Codes (DTCs) on the CRUISE indicator. By reading the DTCs and following the diagnostic tables later in this section, any electrical problem in the cruise control system can be identified and repaired.

Refer to and perform the cruise control On-Board Diagnostic (OBD) system check Diagnostic System Check - Cruise Control to determine if a malfunction has occurred within the electronic cruise control system components.

When a system fault is identified, the cruise control module will automatically disable cruise control operation. When this occurs, the cruise control module flashes the CRUISE indicator as long as the cruise is ON. If the system faulty is still present after the cruise control has been turned OFF and then turned back ON, the CRUISE indicator will flash again. In these cases, there is definitely a DTC stored in the cruise control module's memory and system repair is required.