DTC B1558: PZM EEPROM Checksum Error: Description

At beginning of ignition cycle, PZM adds the checksum of Electronically Erasable Programmable Read Only Memory (EEPROM) block and that block's twos complement. 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 Testing

If DTC B1558 is set, clear DTCs and cycle ignition. If DTC B1558 sets, replace PZM. See REMOVAL & INSTALLATION.