Circuit Description
The folding top control (FTC) module monitors the folding top pump motor temperature, checking the temperature once every 300 milliseconds. The FTC module supplies a 5-volt reference and monitors the sensor low reference voltage from the thermistor located in the folding top pump motor. As the pump motor warms up and the temperature increases, the thermistor resistance will increase. The FTC module monitors the voltage drop across the thermistor and uses it to calculate the temperature of the pump motor. When the FTC module detects that the temperature is above the maximum operating range, it will set this DTC.
DTC Descriptor
The diagnostic procedure supports the following DTC:
DTC B3670 Pump Motor Temperature Sensor Circuit
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. The battery voltage is between 9-16 volts. |
| • | The FTC module is in Accessory, RUN, or RAP. |
Conditions for Setting the DTC
The FTC module will set this DTC under the following conditions:
| • | The FTC module detects that the folding top pump motor temperature is greater than 115°C (239°F). |
| • | The FTC module detects that the folding top pump motor temperature is less than -20°C (-4°F) +/-5°C. |
Action Taken When the DTC Sets
| • | Stores a current and history DTC B3670 in the FTC module. |
| • | The FTC module will allow the top to be closed but not opened until the until the condition is cleared. |
| • | A class 2 message is sent to the driver information center, TOP MOTOR OVER TEMP, as the folding top switch is pressed. |
Conditions for Clearing the DTC
| • | This DTC will become history once the pump motor temperature is below 90°C (194°F). |
| • | A history DTC will clear after 50 consecutive ignition cycles without a fault present. |
| • | History and current DTC can be cleared using the scan tool. |
Diagnostic Aids
| • | This DTC may set under normal operating conditions. Each time the folding top is moved to the open and closed positions it will cause the temperature of the pump motor to increase. Therefore, numerous cycles of the power folding top may raise the temperature to the point for which this DTC will set. Because this DTC can set under normal operating conditions, the following conditions must also be considered when diagnosing this DTC: |
| - | High ambient temperature--A high ambient temperature will limit the number of times the system will operate. |
| - | Low ambient temperature--A low ambient temperature will limit the number of times the system will operate. |
| • | This DTC may set in low temperature conditions that is below the recommended temperature for folding top operation. Refer to Pump Motor and Temperature Sensor in Power Folding Top Description and Operation . |
| • | The following conditions may cause an intermittent malfunction: |
| - | An intermittent sticking or binding linkage condition can cause excessive current draw resulting in a temperature out of range. |
| - | The folding top pump motor or thermistor is shorted internally. |
| • | 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 . |
Step | Action | Values | 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 | |||||||
2 |
Is DTC B3670 present? | -- | Go to Step 3 | Go to Diagnostic Aids | ||||||
3 |
Does the voltage measure near the specified value? | 5 V | Go to Step 4 | Go to Step 5 | ||||||
4 | Measure the voltage between the 5-volt reference circuit and the signal circuit of the pump motor temperature sensor. Does the voltage measure near the specified value? | 5 V | Go to Step 7 | Go to Step 6 | ||||||
5 | Test the 5-volt reference circuit of the pump motor temperature sensor for the following conditions:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 8 | ||||||
6 | Test the signal circuit of the pump motor temperature sensor for the following conditions:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 8 | ||||||
7 | Inspect for poor connections at the harness connector of the folding top pump motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 9 | ||||||
8 | Inspect for poor connections at the harness connector of the folding top control (FTC) 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 11 | Go to Step 10 | ||||||
9 | Replace the folding top pump motor. Refer to Folding Top Pump with Motor Replacement . Did you complete the replacement? | -- | Go to Step 11 | -- | ||||||
10 | Replace the FTC module. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 11 | -- | ||||||
11 |
Does the DTC reset? | -- | Go to Step 2 | System OK | ||||||
