B1826

CIRCUIT DESCRIPTION
The sensor that sets this diagnostic trouble code (DTC) is either attached to the seat directional motor drive cable or directly to the motor it monitors. It receives a 5 volt reference and ground from the memory seat module (MSM). The sensor also has a signal circuit that is wired to the MSM. The sensor sends a voltage signal that varies with the movement of the seat through the signal circuit to the MSM. Then based on this voltage signal, the MSM determines the position of the seat.

CONDITIONS FOR RUNNING THE DTC
The MSM must be powered and can not have B1327-Battery Voltage Low set as a current DTC for this DTC to set.

CONDITIONS FOR SETTING THE DTC
It the input received by the MSM from a motor being driven in a commanded direction changes by more than 10 counts or 0.1 volts in the wrong direction, the MSM will set this DTC.

ACTION TAKEN WHEN THE DTC SETS
^ The MSM will disable the affected motor during memory recall or easy exit operations.
^ The affected motor will respond to manual positioning commands.

CONDITIONS FOR CLEARING THE DTC
The MSM will clear the DTC as an active malfunction whenever a manual switch is activated and the MSM sees that the sensor input changes by more than 2 counts or 0.02 volts in the correct direction.

DIAGNOSTIC AIDS
All position sensors use common ground and 5 Volt reference circuits.

TEST DESCRIPTION

Steps 1-9:

The number(s) below refer to the step number(s) on the diagnostic table.
2. This step checks the direction in which the volts change as the switch is activated. The voltage should increase for the forward or up position and decrease for the rearward or down position.
4. This step checks the polarity of the seat or lumbar position sensor wiring.
5. This step checks the polarity of the seat or lumbar motor wiring.
6. This step checks the polarity of the seat or lumbar switch wiring.