B1558

CIRCUIT DESCRIPTION
DTC B1558 is an internal Body Control Module (BCM) fault.

CONDITIONS FOR SETTING THE DTC
The checksum is tested once on wake-up. The fault is set if the running checksum does not match the computed checksum.

ACTION TAKEN WHEN THE DTC SETS
Stores a DTC B1558 in the BCM memory.

CONDITIONS FOR CLEARING THE DTC
^ The conditions for the fault are no longer present.
^ A history DTC will clear after 50 consecutive ignition cycles if the condition for the fault is no longer present.

DIAGNOSTIC AIDS
^ The DTC may be set as a history DTC with no affect on the control module.
^ If the DTC is retrieved as both a history DTC and a current DTC, the module must be replaced.

TEST

Steps 1-3: