The position sensor that sets this DTC is attached to the seat directional motor. It receives a 5-volt reference and low reference 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 seat.
This diagnostic procedure supports the following DTCs:
• | DTC B1770 Driver Seat Motor 2 (assembly horizontal) Circuit |
• | DTC B1775 Driver Seat Motor 3 (front vertical) Circuit |
• | DTC B1780 Driver Seat Motor 4 (rear vertical) Circuit |
• | DTC B1785 Driver Seat Motor 5 (recline) Circuit |
The MSM must be powered and cannot have B1327 - Battery Voltage Low as an active DTC for this DTC to set.
If the MSM sees the voltage signal from this sensor as either lower than 0.25 volts or higher than 4.75 volts, the sensor will be considered out of range and the MSM will set this DTC.
• | Current and history codes are set. |
• | The MSM disables the affected motor during memory recall operations. |
• | The affected motor will respond to manual positioning commands. |
• | The MSM will clear the DTC when it detects that the voltage from the sensor signal circuit is between 0.25-4.75 volts. |
• | The MSM will clear the history DTC after 50 fault free ignition cycles. |
• | All position sensors use common low reference 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 low reference circuit is open multiple codes will set. |
The numbers below refer to the step numbers on the diagnostic table.
Tests for the proper operation of the circuit in the low voltage range.
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.
Tests for a short to voltage in the 5-volt reference circuit.
Tests for a high resistance or an open in the sensor low reference circuit.
This step verifies the repair.
Step | Action | Values | Yes | No | ||||||
---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Driver Seat Schematics Connector End View Reference: Power Seat 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 Sensor parameter 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 scan tool indicate that the Sensor parameter is less than the specified value? | 2 V | Go to Step 4 | Go to Step 10 | |||||||
Does the scan tool indicate that the Sensor parameter 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? | 5.5 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 the following:
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 the following:
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 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 MSM. 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 | Replace the appropriate seat position sensor. Did you complete the replacement? | -- | Go to Step 16 | -- | ||||||
15 | Replace the MSM. 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 |