B1918

DTC B1918

CIRCUIT DESCRIPTION
The heated seat mode and temperature switches are normally open. When the switch is pressed, it momentarily sends a 12 volt signal to the door control module. The door module then momentarily pulls the appropriate signal circuit of the heated seat module low. In response, the heated seat module activates the heated seat.

CONDITIONS FOR RUNNING THE DTC
The door module must be powered and can not have B1327-Battery Voltage Low or B1328-Battery Voltage High set as an active DTC for this DTC to set.

CONDITIONS FOR SETTING THE DTC
If the door module detects that a heated seat switch input circuit is active for 30 continuous seconds, the switch will be considered shorted and the DTC will set.

ACTION TAKEN WHEN THE DTC SETS
After the initial heated seat activation, no other heated seat switch activations shall be recognized as a result of this this switch circuit being active.

CONDITIONS FOR CLEARING THE DTC
The DTC automatically clears when the switch circuit setting the DTC is no longer active.

TEST DESCRIPTION

Steps 1 - 3:

Steps 4 - 10:

The numbers below refer to the step numbers on the diagnostic table.
2. Checks the existing state of the heated seat mode BACK ONLY switch by using the current state of the input parameter.