For C0 And C5 Only: DTC detecting condition

ID code box malfunction
When inaccessible to ROM in ID code box.

CHECK DTC.
1. Turn the ignition switch to ON.
2. Perform the clear memory operation of ECM. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Clear Memory Mode .
3. Turn the ignition switch to OFF.
4. Register the ID code box.
5. Read the DTC. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Read Diagnostic Trouble Code (DTC) .
Is DTC B1577 displayed?
- Yes : Replace the ID code box. Ref. to SECURITY AND LOCKS>ID Code Box .
- No : Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis.
  NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.