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.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 PERFORM ECM REGISTRATION. Perform ECM registration. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.	Is registration complete?	Finish the diagnosis.	Go to step 2.
2 PERFORM ECM REGISTRATION. Perform the Clear Memory Mode. (ECM and body integrated unit) < Ref. to CLEAR MEMORY MODE . > Perform ECM registration. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.	Is registration complete?	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.	Replace the body integrated unit. < Ref. to BODY INTEGRATED UNIT . >