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SRS DTC Troubleshooting: 85-4x, 85-63, 85-64

DTC 85-4x, 85-63, 85-64 (‘‘x'' can be 0 thru 9 or A thru F):
 Internal Failure of the OPDS Unit
NOTE:
  1. Turn the ignition switch to ON (II), and check that the SRS indicator comes on for about 6 seconds and then goes off.
Does the SRS indicator go off?
YES -
Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, troubleshoot the DTC.
NO -
Go to Step 3 .
  1. Turn the ignition switch to LOCK (0).
  1. Turn the ignition switch to ON (II), and check that the SRS indicator comes on for about 6 seconds and then goes off.
Does the SRS indicator go off?
YES -
NO -
Replace the OPDS unit and retest. If the problem is still present, replace the OPDS sensor/seat-back cover/pad.