DTC Troubleshooting: 85-4x, 85-5x, 85-63, 85-64

DTC 85-4x, 85-5x (‘‘x'' can be 0 thru 9 or A thru F), 85-63, 85-64:
 Internal Failure of 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.
NO -
Go to Step 3 .
  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 -
The system is OK.■
NO -