Overhead Console: Notes

The most reliable, efficient, and accurate means to diagnose the overhead console or related system requires the use of a diagnostic scan tool and the appropriate Diagnostic Procedures Information. The diagnostic scan tool can provide vital information to the technician trying to find a problem with an overhead console component. Diagnostic logic is built into the overhead console mounted module to help locate the problem by the most efficient means possible. Anytime a problem is suspected, a diagnostic scan tool must be obtained and used to retrieve any stored fault codes in the module. If diagnostic fault codes are present in the module, record them on a piece of paper immediately before proceeding any further. Then, use these fault codes to identify the problem by verifying the fault code. Example, If the module records "EC Mirror Day/Night Line  " fault, locate the diagnostic procedure for this code in the appropriate Diagnostic Procedures Information and follow the flow chart until the specific problem is located and resolved. Once the problem is thought to be corrected, erase the stored fault code using the diagnostic scan tool and verify correct system operation.

If the fault code could not be verified, such as not finding anything wrong when following the diagnostic flow chart in the appropriate Diagnostic Procedures Information, this is a good indication that an INTERMITTENT problem may be present. You must then attempt to find and repair the intermittent problem prior to performing additional diagnostics or repairs. Always, eliminate all other potential problems before attempting to replace the module.