B1390

DTC B1390

CIRCUIT DESCRIPTION
The DIM has an internal battery voltage sense input and a reference voltage input. The DIM compares these 2 voltages via the 2 battery positive voltage circuits every 300 milliseconds.

CONDITIONS FOR RUNNING THE DTC
This DTC will run only if the DIM has battery positive voltage power and ground. This DTC will execute regardless of the source voltage.

CONDITIONS FOR SETTING THE DTC
This code shall be set after 10 consecutive readings that the 2 battery positive voltages differ by 1 volt or greater.

ACTION TAKEN WHEN THE DTC SETS
All writes to the EEPROM will be suspended. Setting of all loss of communication and low/high voltage DTCs are suspended.

CONDITIONS FOR CLEARING THE DTC
- A current DTC clears when the malfunction is no longer present.
- A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.

TEST

Steps 1-3:

Steps 4-7: