Subaru Crosstrek Service Manual: Dtc b1577 imm control module eeprom
KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC B1577 IMM CONTROL MODULE EEPROM
1. EXCEPT FOR C0 AND C5 MODELS
DTC detecting condition:
• Defective keyless access CM
• When inaccessible to ROM in keyless access CM.
| STEP | CHECK | YES | NO |
1.CHECK DTC.
1) Turn the ignition switch to ON.
2) Perform the clear memory operation of ECM. Clear Memory Mode">
3) Turn the ignition switch to OFF.
4) Remove and install the battery.
5) Turn the ignition switch to ON.
6) After 5 seconds or more, read DTC. Read Diagnostic Trouble Code (DTC)">
Is DTC B1577 displayed?
Replace the keyless access CM. Keyless Access CM">
Even if DTC is displayed, 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.
2. FOR C0 AND C5 MODELS
DTC detecting condition:
• ID code box malfunction
• When inaccessible to ROM in ID code box.
| STEP | CHECK | YES | NO |
1.CHECK DTC.
1) Turn the ignition switch to ON.
2) Perform the clear memory operation of ECM. Clear Memory Mode">
3) Turn the ignition switch to OFF.
4) Register the ID code box.
5) Read the DTC again. Read Diagnostic Trouble Code (DTC)">
Is DTC B1577 displayed?
Replace the ID code box. ID Code Box">
Even if DTC is displayed, 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.
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