Cruise Control: Testing and Inspection

Self-Diagnostic Function
The self-diagnostic function integrated within the cruise control unit, diagnoses the condition of the cruise control system.
Condition/operation codes are indicated by the cruise indicator in the instrument cluster. This operation continues until canceled.





1. Code Cycle Break
The time between condition code cycles is 4.0 seconds (the time the cruise indicator is OFF).





2. Second Digit of code (Ones Position)
The digit in the ones position of the code represents the number of time the lamp is ON (0.4 seconds) during one cycle.




3. First Digit of code (Tens Position)
The digit in the tens position of the code represents the number of times the lamp is ON (1.2 seconds) during one cycle. The lamp remains OFF the 1.6 seconds between the long and short flashes.




Code Retrieval
The codes for the cruise control system are only available for retrieval when the cruise indicator in the instrument cluster is lit, indicating a problem with the cruise control system. Turning the ignition key "OFF" with the cruise indicator lit will clear the codes from memory. To retrieve the codes, follow the steps listed below.

1. Do not turn the ignition switch "OFF."
2. Connect a jumper wire at Data Link Connector (DLC) between test terminal 17 and ground terminal 12.
3. Observe the cruise control indicator in the instrument cluster.




Self Diagnosis of Malfunction
The cruise indicator will flash if a malfunction is present.