DTC B1577: IMM Control Module EEPROM

DTC detecting condition: 

• Body integrated unit malfunctioning
• Failed to access ROM inside the body integrated unit.
  CAUTION: When the body integrated unit is replaced, registration of the immobilizer system is required. For details, refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.

1. PERFORM ECM REGISTRATION. 

   Perform ECM registration. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.

   Is registration complete?

   Yes:  Finish the diagnosis.

   No:  Go to  2.

2. PERFORM ECM REGISTRATION. 

   Perform the Clear Memory Mode. (ECM and body integrated unit) Refer to IMMOBILIZER (DIAGNOSTICS)>CLEAR MEMORY MODE .

   Perform ECM registration. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.

   Is registration complete?

   Yes:  Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again

   NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

   No:  Refer to "Correspondence table when registration is not possible" in the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume. If the registration still does not work properly, replace the body integrated unit. Refer to SECURITY AND LOCKS>BODY INTEGRATED UNIT .