DTC B1558, PZM EEPROM Checksum Error
WARNING: This page is about a different car, the 1997 Cadillac Seville, 1997 Cadillac Eldorado, and 1997 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
Within 2.5 seconds after ignition switch is turned to RUN position, PZM adds the checksum of EEPROM block. DTC B1558 will set when value of addition does not equal zero. When DTC B1558 is set, PZM will clear all codes, set DTC B1558 as current and default to the following:
- Personalization - Factory Default
- Ignition Cycle Counter - Zero
- Theft Alarm Condition - Cleared
If DTC B1558 is set, clear DTCs and cycle ignition. If DTC B1558 sets, replace PZM.