Circuit Description
The sensor that sets this diagnostic trouble code (DTC) is attached to the seat direction motor it monitors. The sensor is a potentiometer whose supply and ground are portions of the sensor 5 V supply bus and the ground bus provided by the memory seat module (MSM). The sensor analog output signal is wired directly to the MSM. The MSM checks the signal to determine seat motor position.
Conditions for Running the DTC
The MSM must be powered and can not have 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 during one cycle of checking the MSM inputs, the MSM sets this DTC.
Action Taken When the DTC Sets
The MSM disables the memory recall and easy exit/entry actuation commands of the motor monitored by the sensor. The motor will respond to manual actuation commands.
Conditions for Clearing the DTC
The MSM will clear the DTC as an active malfunction when the MSM sees the analog input from this sensor as between 0.25 V and 4.75 V during one cycle of checking the MSM inputs.
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.
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This step verifies the repair.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Power Seat Systems? | -- | ||
2 |
Does the scan tool indicate that the Lumbar Vertical Sensor parameter is within the specified range? | 0.25-4.75 V | Go to Diagnostic Aids | |
Does the scan tool indicate that the Lumbar Vertical Sensor parameter is less than the specified value? | 0.25 V | |||
Does the scan tool indicate that the Lumbar Vertical Sensor parameter is greater than the specified value? | 4.75 V | |||
Does the voltage measure less than the specified value? | 5 V | |||
Does the resistance measure less than the specified value? | 5 ohms | |||
7 | Test the 5 volt reference circuit of the lumbar vertical sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
8 | Test the 5 volt reference circuit of the lumbar vertical sensor for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
9 | Test the signal circuit of the lumbar vertical 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? | -- | ||
10 | Test the signal circuit of the lumbar vertical sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
11 |
Did you find and correct the condition? | -- | ||
12 | Inspect for poor connections at the harness connector of the lumbar vertical sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
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? | -- | ||
14 | Replace the seat lumbar vertical sensor. Refer to Front Seat Lumbar Support Replacement . Did you complete the replacement? | -- | -- | |
15 | Replace the memory seat module. Refer to Memory Seat Control Module Replacement . Did you complete the replacement? | -- | -- | |
Does the DTC reset? | -- | System OK |
