FCM SIACM Run/Start Driver Over Volt (Stored)

Test 1:

SYMPTOM
FCM, SIACM RUN-START DRIVER OVER VOLT - STORED

TEST NOTE
This symptom is diagnosed using the test FCM, ORC RUN ONLY DRIVER OPEN - STORED.

WHEN MONITORED
The FCM uses a microprocessor controlled transistor (high side driver) to supply power to the SIACM. The microprocessor monitors the High Side Driver (HSD) battery voltage when the ignition is in the Run or Start position.

SET CONDITION
The code will set if the microprocessor senses the HSD battery voltage is over 30 volts.

POSSIBLE CAUSES
- Checking for active front control module DTCS
- Stored code present