B1390

Diagnostic Chart:

Schematics:

CIRCUIT DESCRIPTION
The DIM has an internal battery voltage sensor and a reference voltage. The DIM compares the voltages every 300 milliseconds.

CONDITIONS FOR RUNNING THE DTC
This DTC will run only if the DIM has 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 two voltages differ by 1 volt or greater.

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

CONDITIONS FOR CLEARING THE MIL/DTC
In order to clear the DTC from a current status, the two voltages will differ less than 1 volt for 10 consecutive readings.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
7. This step verifies that a fault in the steering wheel control feed circuit is not causing the module to measure a false voltage.