Circuit Description
The seat belt tower motor position 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 V reference and ground from the memory seat module (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 belt tower.
Conditions for Running the DTC
The MSM must be powered and can not have DTC B1327 Battery Voltage Low set as an active DTC for this DTC to set.
Conditions for Setting the DTC
If the MSM sees the analog input from this sensor as either lower than 0.25 V or higher than 4.75 V, the sensor will be considered out of range and the MSM will set this DTC.
Action Taken When the DTC Sets
The MSM disables the memory recall and easy exit/entry action commands of the motor monitored by the sensor. The motor will respond to manual positioning commands.
Conditions for Clearing the DTC
The MSM will clear the DTC as an active malfunction when it sees the analog input from this sensor as between 0.25 V and 4.75 V during one cycle of checking the MSM inputs.
Diagnostic Aids
| • | All position sensors use common ground and 5 volt reference circuits. |
| • | If the 5 volt reference circuit is shorted to voltage multiple codes will set. |
| • | If the 5 volt reference circuit is shorted to ground multiple codes will set. |
| • | If the sensor ground circuit is open multiple codes will set. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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Tests for the proper operation of the circuit in the low voltage range.
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Tests for the proper operation of the circuit in the high voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to ground.
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Tests for a short to voltage in the 5 volt reference circuit.
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Tests for a high resistance or an open in the ground circuit.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Memory Seats Schematics Connector End Views Reference: Power Seat Connector End Views | ||||
1 | Did you perform A Diagnostic System Check - Power Seat Systems? | -- | Go to Step 2 | |
2 |
Does the DMM indicate that the Seat Belt Tower Motor Position Sensor Signal is within the specified range? | 0.25-4.75 V | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
Does the DMM indicate that the Seat Belt Tower Motor Position Sensor Signal is less than the specified value? | 0.25 V | Go to Step 4 | Go to Step 10 | |
Does the DMM indicate that the Seat Belt Tower Motor Position Sensor Signal is greater than the specified value? | 4.75 V | Go to Step 5 | Go to Step 8 | |
Does the voltage measure less than the specified value? | 5 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 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 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 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 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 belt tower 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 memory seat 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: The seat belt tower motor position sensor can only be serviced/replace with the seat belt height adjuster. Replace the seat belt height position sensor. Refer to Seat Belt Height Adjuster Replacement - Front . Did you complete the replacement? | -- | Go to Step 16 | -- |
15 | Replace the memory seat module. Refer to Memory Seat Control Module Replacement in Seats. Did you complete the replacement? | -- | Go to Step 16 | -- |
16 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
