B370F
DTC B370F
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B370F 01
-
Folding Top Stowed Position Sensor Voltage Supply Circuit Short to Battery
DTC B370F 02
-
Folding Top Stowed Position Sensor Voltage Supply Circuit Short to Ground
DTC B370F 04
-
Folding Top Stowed Position Sensor Voltage Supply Circuit Open
Diagnostic Fault Information
Circuit/System Description
The folding top position sensor is a two-wire hall effect sensor providing an input signal to the folding top control (FTC) module indicating whether or not the top is fully retracted into its trunk storage area (Down) and properly stowed. The folding top control module supplies a switched filtered battery voltage to one terminal. The other terminal is a current source providing a signal to the folding top control module.
When the hydraulic cylinder is fully retracted, the top is down (open) and stowed. At this point the cylinder's piston is near the sensor which affects the sensor's internal magnetic field. The sensor's output current enters into the 2-5 ma range and the sensor is considered active. As the cylinder extends and the top leaves the stowed position, the cylinder's piston moves away from the sensor changing its magnetic field back to its normal state. The sensor's output current enters into the 12-17 ma range and the sensor is considered inactive.
Conditions for Running the DTC
* Battery voltage must be between 9-16 V.
* Folding top operation.
Conditions for Setting the DTC
B370F 01
The FTC module detects a short to voltage on the folding top position sensor B+ circuit.
B370F 02
The FTC module detects a short to ground on the folding top position sensor B+ circuit.
B370F 04
The FTC module detects an open/high resistance on the folding top position sensor B+ circuit.
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists.
Diagnostic Aids
* Scan tool must remain connected and turned on to keep K23 folding top module active during diagnostics.
* DTC B369E 06 and B370F 04 set when the harness connector at the B45 folding top position sensor is disconnected.
* A test lamp connected between terminals 1 and 2 of the B45 folding top position sensor will illuminate at low intensity.
Reference Information
Schematic Reference
Folding Top Schematics [1][2]Convertible Top
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly - Primary
Description and Operation
Power Folding Top Description and Operation Power Folding Top
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the B45 folding top position sensor.
2. Connect a test lamp between the B+ circuit terminal 1 and ground.
3. Ignition ON, trunk closed, command the power folding top to open and close with the power folding top switch. The test lamp should illuminate when the power folding top switch is activated.
• If the test lamp is always ON, test the B+ circuit for a short to voltage. If the circuit tests normal, replace the K23 folding top control module.
• If the test lamp is always OFF, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K23 folding top control module.
4. Ignition OFF, connect a test lamp between the B+ circuit terminal 1 and the signal circuit terminal 2.
5. Ignition ON, command the power folding top to open and close with the power folding top switch. The test lamp should illuminate when the power folding top switch is activated.
• If the test lamp does not illuminate, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K23 folding top control module.
6. Ignition OFF, disconnect the X1 harness connector at the K23 folding top control module.
7. Test for infinite resistance between the signal circuit terminal 9 and ground.
• If not the specified value, test the signal circuit for a short to ground.
8. If all circuits test normal, replace the B45 folding top position sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Roof Retractable Position Sensor Replacement Roof Retractable Position Sensor Replacement
* Control Module References Control Module References for FTC module replacement, programming and setup