Im connected to a GM OBDI RWAL controller and cant determine what the error codes are. What can I do?
For the RWAL controller, the possible DTCs are listed on the Main DTC screen, however, the status (Fault or OK) is not displayed. To determine the RWAL DTC number, observe the flashing brake lamp on the vehicle dash. In counting the brake lamp flashes, count the number of short flashes starting from the long flash. Include the long flash as a count. Note that sometimes the first count sequence is short because the flashout started with the count already in progress. Subsequent counts, however, will be accurate. If there is more than one failure, only the first recognized failure code will be retained and flashed.
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