B3971

DTC B3971

Circuit Description
The folding top control (FTC) module supplies a 5-volt reference and low reference circuit to the folding top position sensor. The position sensor sends a voltage signal that varies with the movement of the folding top panel through the signal circuit to the FTC module. Then based on this voltage signal, parameters are converted and displayed as counts, the FTC module determines the position of the folding top and continues with the operating sequence.

DTC Descriptor
The diagnostic procedure supports the following DTC.

DTC B3671 Folding Top Position Error

Conditions for Running the DTC
The FTC module must be powered and can not have B1327 or B1328 set as active DTCs for this DTC to set.

Conditions for Setting the DTC
If the FTC module sees the analog input from this position sensor as either lower than 0.25 volts (12 Counts or less) or higher than 4.75 volts (242 Counts or above), the position sensor will be considered out of range and the FTC module will set this DTC.

Action Taken When the DTC Sets
^ The FTC module disables all folding top functions.
^ If the condition occurs during operation of the folding top, once the top control switch is released, the FTC module will send a class 2 message to the driver information center (DIC), displaying: TOP NOT SECURE.

Conditions for Clearing the DTC
The FTC module will clear the DTC as an active malfunction when it sees the analog input from this position sensor as between 0.25 volts (12 counts) and 4.75 volts (242 Counts) during one cycle of checking the FTC module inputs.

Diagnostic Aids
If the DTC does not reset after the code is cleared, then the switch may be the intermittent fault.

All position sensors use common ground and 5-volt reference circuits.

Multiple DTCs, B3665 and B3666 can set:

^ If the 5-volt reference circuit is shorted to voltage.
^ If the 5-volt reference circuit is shorted to ground.
^ If the position sensor ground circuit is open.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
3. Tests for the proper operation of the circuit in the low count range.
4. Tests for the proper operation of the circuit in the count range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to ground.
5. Tests for a short to voltage in the 5-volt reference circuit.
6. Tests for a high resistance or an open in the ground circuit.
16. This step verifies the repair.