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 B3971 Folding Top Position Sensor
Conditions for Running the DTC
The FTC module must be powered and cannot 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. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
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.
-
This step tests for the proper operation of the circuit in the low count range.
-
This step 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.
-
This step tests for a short to voltage in the 5-volt reference circuit.
-
This step tests for a high resistance or an open in the ground circuit.
-
This step verifies the repair.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Folding Top Schematics Connector End View Reference: Power Roof Systems Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the scan tool indicate that the Position Sensor parameter is within the specified range? | 12-243 Counts | Go to Diagnostic Aids | Go to Step 3 |
Does the scan tool indicate that the Position Sensor parameter is less than the specified value? | 10 Counts | Go to Step 4 | Go to Step 10 | |
Does the scan tool indicate that the Position Sensor parameter is greater than the specified value? | 242 Counts | Go to Step 5 | Go to Step 8 | |
Does the voltage measure less than the specified value? | 5.50 V | Go to Step 6 | Go to Step 7 | |
Does the resistance measure less than the specified value? | 5 ohms | Go to Step 12 | Go to Step 11 | |
7 | Test the 5-volt reference circuit of the position sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 |
8 | Test the 5-volt reference circuit of the position sensor for a short to ground, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 9 |
9 | Test the signal circuit of the position sensor for a short to ground, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 |
10 | Test the signal circuit of the position sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 |
11 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 |
12 | Inspect for poor connections at the harness connector of the position sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 14 |
13 | Inspect for poor connections at the harness connector of the folding top module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 15 |
14 |
Important: Perform the setup procedure for the folding top control module.
Did you complete the replacement? | -- | Go to Step 16 | -- |
15 | Replace the folding top control module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 16 | -- |
Does the DTC reset? | -- | Go to Step 2 | System OK | |
