DTC 51-2x (51-20 to 51-29, 51-2A to 51-2F),51-4x (51-40 to 51-49, 51-4A to 51-4F), 51-7x (51-70 to 51-79, 51-7A to 51-7F): Internal Failure of the SRS Unit NOTE: Before troubleshooting any of these DTCs, check the battery/system voltage. If the voltage is low, repair the charging system or replace the battery before troubleshooting the SRS. If the battery/system voltage is now OK, ask the customer if the battery ever went dead. A dead battery may trigger one of these DTCs. Erase the DTC memory. Turn the ignition switch ON (II), and check that the SRS indicator comes on for about 6 seconds and then goes off. Does the SRS indicator stay on and is DTC 51-2x, 51-4x or 51-7x indicated?
YES | - | Replace the SRS unit. ■
NO | - | Intermittent failure, system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, go to the DTC troubleshooting index for troubleshooting details.