Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 2: This step checks the existing state of the driver seat switch by using the current state of the seat switch parameter. If all of the seat switch parameters display active, possibly one of the seat switch signal circuits is shorted to voltage.
- 4: When the seat switch is disconnected, this step determines if the seat switch contacts are stuck closed or if one of the switch signal circuits is possibly shorted to battery voltage.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Driver Seat Schematics Connector End View Reference: Power Seat Systems 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 | Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, observe the appropriate seat switch parameter in the Driver Position Module data list. Does the scan tool display Inactive? | Go to Step 3 | Go to Step 4 |
| 3 | With a scan tool, observe the appropriate seat switch parameter. Activate the appropriate seat switch. Does the switch parameter change state? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 4 |
| 4 | Turn OFF the ignition. Disconnect the seat adjuster switch harness connector. Turn ON the ignition, with the engine OFF. With a scan tool, observe all of the switch parameters in the Driver Position Module data list. Does the scan tool display Inactive for all of the switch parameters? | Go to Step 7 | Go to Step 5 |
| 5 | Test the switch signal circuit that displays active 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 10 | Go to Step 6 |
| 6 | Inspect for poor connections at the harness connector of the memory seat module (MSM)/driver position module (DPM). 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 10 | Go to Step 8 |
| 7 | Inspect for poor connections at the harness connector of the seat adjuster switch. 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 10 | Go to Step 9 |
| 8 | Replace the MSM/DPM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming. Did you complete the replacement? | Go to Step 10 | |
| 9 | Replace the seat adjuster switch. Refer to Seat Switch Replacement - Power . Did you complete the replacement? | Go to Step 10 | |
| 10 | Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset? | Go to Step 2 | System OK |
DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815 or B1820: Front/Rear Seat Switch Circuit Problems
The numbers below refer to the step numbers on the diagnostic table.
- 3: Tests for the proper operation of the circuit in the low voltage range.
- 4: 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.
- 5: Tests for a short to voltage in the 5-volt reference circuit.
- 6: Tests for a high resistance or an open in the sensor low reference circuit.
- 16: This step verifies the repair.
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Driver Seat Schematics Connector End View Reference: Power Seat Systems 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 | Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, observe the appropriate Sensor parameter in the Driver Position Module Sensor data list. 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 |
| 3 | Turn OFF the ignition. Disconnect the appropriate sensor harness connector. Turn ON the ignition, with the engine OFF. With a scan tool, observe the Sensor parameter. 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 |
| 4 | Turn OFF the ignition. Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the sensor connector and the signal circuit of the sensor connector. Turn ON the ignition, with the engine OFF. With a scan tool, observe the appropriate Sensor parameter. 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 |
| 5 | Disconnect the fused jumper wire. Measure the voltage between the 5-volt reference circuit of the sensor connector and the low reference circuit of the sensor connector. Does the voltage measure less than the specified value? | 5.5 V | Go to Step 6 | Go to Step 7 |
| 6 | Turn OFF the ignition. Disconnect the negative battery cable. Measure the resistance from the low reference circuit of the sensor to a good ground. 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: A short to ground An open High resistance 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: A short to ground An open High resistance 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 | Disconnect the memory seat module (MSM) connector C2. Test the low reference circuit of the sensor for 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 | |
| 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 | ||
| 16 | Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset? | Go to Step 2 | System OK | |
DTC B1770, B1775, B1780, B1785, B1790, B1805 or B2415: Driver Seat Motor(s) Malfunction(s)
The numbers below refer to the step numbers on the diagnostic table.
- 2: This step checks the direction in which the volts change as the switch is activated. The voltage should increase for the forward or up position and decrease for the rearward or down position.
- 4: This step checks the polarity of the seat position sensor wiring.
- 5: This step checks the polarity of the seat motor wiring.
- 6: This step checks the polarity of the seat switch wiring.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Driver Seat Schematics Connector End View Reference: Power Seat Systems 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 | Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, observe the appropriate Sensor parameter. Activate the appropriate seat switch in the FORWARD or UP direction. Does the voltage increase? | Go to Step 9 | Go to Step 3 |
| 3 | Does the seat move in the commanded direction? | Go to Step 4 | Go to Step 5 |
| 4 | Verify that the seat position sensor wiring circuits are in the correct harness connector cavities. Did you find and correct the condition? | Go to Step 9 | Go to Step 7 |
| 5 | Verify that the seat motor wiring circuits are in the correct harness connector cavities. Did you find and correct the condition? | Go to Step 9 | Go to Step 6 |
| 6 | Verify that the seat switch wiring circuits are in the correct harness connector cavities. Did you find and correct the condition? | Go to Step 9 | Go to Step 7 |
| 7 | Inspect for poor connection at the harness connector of the memory seat module (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 9 | Go to Step 8 |
| 8 | 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 9 | |
| 9 | Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset? | Go to Step 2 | System OK |
DTC B1825, B1850, B2355, B2365 or B2375: Driver's Seat Vertical Or Horizontal Position Sensors
The numbers below refer to the step numbers on the diagnostic table.
- 2: If an active DTC is set, the BCM will turn OFF the heated seat relay, not allowing for an accurate test of the relay. By cycling the ignition switch, the BCM turns OFF the active DTC allowing for an accurate test.
- 3: This test determines the functionality of the heated seat relay.
- 22: This test verifies the repair.
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Driver Seat Schematics or Passenger Seat Schematics Connector End View Reference: Power Seat Systems 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 | Turn OFF the ignition. Turn ON the ignition, with the engine OFF. Connect a test lamp from the heated seat element supply voltage circuit of the heated seat relay to a good ground. Turn ON the heated seat to the high heat position. Does the test lamp illuminate? | Go to Step 4 | Go to Step 3 | |
| 3 | Disconnect the heated seat relay. Connect a test lamp from the battery positive voltage circuit of the relay connector to ground. Does the test lamp illuminate? | Go to Step 13 | Go to Step 18 | |
| 4 | Disconnect the heated seat relay. Measure the resistance from the heated seat element supply voltage circuit of the relay connector to ground. Does the resistance measure less than the specified value? | 5 ohms | Go to Step 7 | Go to Step 5 |
| 5 | Disconnect the seat cushion heater element. Measure the resistance across the circuits of the seat cushion heater element harness connector. Does the resistance measure less than the specified value? | 5 ohms | Go to Step 6 | Go to Step 14 |
| 6 | Disconnect the seat back heater element. Measure the resistance across the circuits of the seat back heater element harness connector. Does the resistance measure less than the specified value? | 5 ohms | Go to Step 10 | Go to Step 15 |
| 7 | IMPORTANT: If the resistance is measured with the seat still warm, the resistance may vary outside of the specified range since the thermistor resistance varies with temperature. Disconnect the body control module (BCM) connector C2. Measure the resistance between the temperature sensor signal circuit and the sensor low reference circuit of the BCM connector. Does the resistance measure within the specified range? | 535-168,000 ohms | Go to Step 12 | Go to Step 8 |
| 8 | Test the heated seat temperature sensor signal circuit and the temperature sensor low reference circuit, between the BCM and the temperature sensor, for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 22 | Go to Step 9 | |
| 9 | Test the heated seat temperature sensor signal circuit, between the BCM and the temperature sensor for a short to battery positive voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 22 | Go to Step 14 | |
| 10 | Test the heated seat element supply voltage circuit between the heated seat relay and the seat cushion heating element for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 22 | Go to Step 11 | |
| 11 | Test the heated seat element supply voltage circuit between the seat cushion heating element and the seat back heating element for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 22 | Go to Step 17 | |
| 12 | Test the heated seat element supply voltage circuit between the seat cushion heating element and the seat back heating element for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 22 | Go to Step 16 | |
| 13 | Inspect for poor connections at the harness connector of the heated seat relay. 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 22 | Go to Step 19 | |
| 14 | Inspect for poor connections at the harness connector of the heated seat cushion heating element/temperature 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 22 | Go to Step 20 | |
| 15 | Inspect for poor connections at the harness connector of the heated seat back heating element. 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 22 | Go to Step 20 | |
| 16 | Inspect for poor connections at the harness connector of the BCM. 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 22 | Go to Step 21 | |
| 17 | Repair the open in the ground circuit of the seat heating elements. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 22 | ||
| 18 | Repair the short to ground or open in the battery positive voltage circuit of the heated seat relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 22 | ||
| 19 | Replace the heated seat relay. Refer to Relay Replacement (Within an Electrical Center) or Relay Replacement (Attached to Wire Harness) in Wiring Systems. Did you complete the replacement? | Go to Step 22 | ||
| 20 | Replace the heated seat cushion heating element/temperature sensor or seat back heating element. Refer to Seat Back Heater Element Replacement - Front and Seat Cushion Heater Element Replacement - Front . Did you complete the replacement? | Go to Step 22 | ||
| 21 | Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming. Did you complete the replacement? | Go to Step 22 | ||
| 22 | Clear the DTCs using the scan tool. Operate the vehicle within the Conditions for Running the DTC, as specified in the supporting text. Does the DTC reset? | Go to Step 2 | System OK | |
| IMPORTANT |
|---|
| If the resistance is measured with the seat still warm, the resistance may vary outside of the specified range since the thermistor resistance varies with temperature. |
DTC B1920 or B2165: Seat Heater Timer Circuit
The numbers below refer to the step numbers on the diagnostic table.
- 3: This step tests for the proper operation of the circuit in the high voltage range.
- 4: This step tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens upon performing this test, the signal circuit has a short to voltage.
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Driver Seat Schematics or Passenger Seat Schematics Connector End View Reference: Power Seat Systems 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 | Disconnect the seat cushion heater element connector. Measure the voltage from the temperature sensor signal circuit to a good ground. Does the voltage measure near the specified value? | 10 V | Go to Step 3 | Go to Step 5 |
| 3 | Measure the voltage between the temperature sensor signal circuit and the temperature sensor low reference circuit. Does the voltage measure near the specified value? | 10 V | Go to Step 4 | Go to Step 7 |
| 4 | Measure the resistance between the temperature sensor signal circuit and the temperature sensor low reference circuit. Does the resistance measure within the specified range? | 535-168,000 ohms | Go to Step 9 | Go to Step 8 |
| 5 | Test the temperature sensor signal circuit between the body control module (BCM) and the sensor connector for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 6 | |
| 6 | Test the temperature sensor signal circuit for 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 14 | Go to Step 11 | |
| 7 | Test the low reference circuit of the temperature sensor for 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 14 | Go to Step 11 | |
| 8 | Test the temperature sensor signal circuit for a short to battery positive voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 10 | |
| 9 | Test the temperature sensor signal circuit between the sensor connector and the temperature sensor for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 11 | |
| 10 | Inspect for poor connections at the harness connector of the heated seat temperature 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 14 | Go to Step 12 | |
| 11 | Inspect for poor connections at the harness connector of the BCM. 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 14 | Go to Step 13 | |
| 12 | Replace the heated seat temperature sensor/heater element assembly. Refer to Seat Back Heater Element Replacement - Front and Seat Cushion Heater Element Replacement - Front . Did you complete the replacement? | Go to Step 14 | ||
| 13 | Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming. Did you complete the replacement? | Go to Step 14 | ||
| 14 | Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC. Does the DTC reset? | Go to Step 2 | System OK | |
DTC B1925 or B2170: Seat Heater Sensor Or Sensor Circuit
The numbers below refer to the step numbers on the diagnostic table.
- 2: During the heated seat relay operation, listen for an audible click from the relay. Repeat the commands, as necessary.
- 4: This step verifies that the BCM is providing voltage to the heated seat relay.
- 5: This step tests for an open in the ground circuit to the heated seat relay.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Driver Seat Schematics or Passenger Seat Schematics Connector End View Reference: Power Seat Systems Connector End Views or Computer/Integrating Systems Connector End Views in Computer/Integrating Systems | |||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, navigate to the appropriate Driver or Passenger Heated Seat output control screen by making the following selections: Body control module (BCM) Special functions Output control Miscellaneous tests Access the heated seat relay in order to verify operation. With a scan tool, command the appropriate Heated Seat ON and OFF. Does the heated seat relay turn ON and OFF with each command? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 | Turn OFF the ignition. Disconnect the heated seat relay. Turn ON the ignition, with the engine OFF. Connect a test lamp from the heated seat relay control circuit of the relay connector to ground. Does the test lamp illuminate? | Go to Step 9 | Go to Step 4 |
| 4 | Connect a test lamp between the heated seat relay control circuit of the relay connector to ground. With a scan tool, command the Heated Seat Relay ON and OFF. Does the test lamp turn ON and OFF with each command? | Go to Step 5 | Go to Step 6 |
| 5 | Connect a test lamp between the heated seat relay control circuit of the relay connector to the ground circuit of the relay of the relay connector. With a scan tool, command the Heated Seat Relay ON and OFF. Does the test lamp turn ON and OFF with each command? | Go to Step 7 | Go to Step 10 |
| 6 | Test the heated seat relay control circuit of the heated seat relay for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 8 |
| 7 | Inspect for poor connections at the harness connector of the heated seat relay. 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 13 | Go to Step 11 |
| 8 | Inspect for poor connections at the harness connector of the BCM. 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 13 | Go to Step 12 |
| 9 | Repair the short to battery positive voltage in the heated seat relay control circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | |
| 10 | Repair the open in the ground circuit of the heat seat relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | |
| 11 | Replace the heated seat relay. Refer to Relay Replacement (Within an Electrical Center) or Relay Replacement (Attached to Wire Harness) in Wiring Systems. Did you complete the replacement? | Go to Step 13 | |
| 12 | Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming. Did you complete the replacement? | Go to Step 13 | |
| 13 | Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC. Does the DTC reset? | Go to Step 2 | System OK |
DTC B2508 or B2509
The numbers below refer to the step numbers on the diagnostic table.
- 2: This step checks the existing state of the memory switch by using the current state of the switch parameter.
- 10: This step verifies the repair.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Driver Seat Schematics Connector End View Reference: Power Seat Systems 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 | Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, observe the appropriate memory switch parameter. Does the scan tool display Inactive? | Go to Step 3 | Go to Step 4 |
| 3 | With a scan tool, observe the appropriate memory switch parameter. Activate the appropriate memory switch. Does the switch parameter change state? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 4 |
| 4 | Turn OFF the ignition. Disconnect the memory function switch harness connector. Turn ON the ignition, with the engine OFF. With a scan tool, observe the appropriate switch parameter. Does the scan tool display Inactive for the switch parameter? | Go to Step 7 | Go to Step 5 |
| 5 | Test the switch signal circuit that displays active 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 10 | Go to Step 6 |
| 6 | Inspect for poor connections at the harness connector of the memory seat module (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 10 | Go to Step 8 |
| 7 | Inspect for poor connections at the harness connector of the memory function switch. 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 10 | Go to Step 9 |
| 8 | 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 10 | |
| 9 | Replace the memory function switch. Did you complete the replacement? | Go to Step 10 | |
| 10 | Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC, as specified in the supporting text. Does the DTC reset? | Go to Step 2 | System OK |
DTC B2755 or B2760
Symptoms - Seats
| IMPORTANT | The following steps must be completed before using the symptom tables. |
- Refer to the system description and operation from the following list in order to familiarize yourself with the system functions: «Power Seats System Description and Operation»(ref-241729-S22067738242006081100000) «Heated Seats Description and Operation»(ref-241729-S16992471852006081100000)
- If you are diagnosing a heated seat concern perform the «Diagnostic System Check - Vehicle»(ref-241670-S16610990062006081100000) in Vehicle DTC Information, before using the symptom tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
The numbers below refer to the step numbers on the diagnostic table.
- 7: If the fuse in the jumper wire opens when you perform this test, the signal circuit is shorted to ground.
- 8: If the fuse in the jumper wire opens when you perform this test, the signal circuit is shorted to ground.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Driver Seat Schematics Connector End View Reference: Power Seat Systems 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 | Verify that the Memory Seat Feature Inoperative complaint is present. Does the memory seat system operate as described in the system description and operation? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 | With a scan tool, observe the Memory Switch parameter. Press the memory 1 button. Does the scan tool display Memory 1? | Go to Step 4 | Go to Step 6 |
| 4 | With a scan tool, observe the Memory Switch parameter. Press the memory 2 button. Does the scan tool display Memory 2? | Go to Step 5 | Go to Step 8 |
| 5 | With a scan tool, observe the Memory Switch parameter. Press the Exit button. Does the scan tool display Exit? | Go to Step 12 | Go to Step 11 |
| 6 | Connect a test lamp from the battery positive voltage circuit of the memory function switch to a good ground. Dose the test lamp illuminate? | Go to Step 7 | Go to Step 13 |
| 7 | Disconnect the memory function switch harness connector. Connect a 3-amp fused jumper wire between the battery positive voltage circuit of the switch harness connector and the memory 1 switch signal circuit of the harness connector. With a scan tool, observe the Memory Switch parameter. Does the scan tool display Memory 1? | Go to Step 11 | Go to Step 9 |
| 8 | Disconnect the memory function switch harness connector. Connect a 3-amp fused jumper wire between the battery positive voltage circuit of the switch harness connector and the memory 2 switch signal circuit of the switch harness connector. With a scan tool, observe the Memory Switch parameter. Does the scan tool display Memory 2? | Go to Step 11 | Go to Step 10 |
| 9 | Test the memory 1 switch signal circuit between the memory function switch and the memory seat module (MSM) for 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 12 |
| 10 | Test the memory 2 switch signal circuit between the memory function switch and the MSM for 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 12 |
| 11 | Inspect for poor connections at the harness connector of the memory function switch. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 16 | Go to Step 14 |
| 12 | Inspect for poor connections at the harness connector of the MSM. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 16 | Go to Step 15 |
| 13 | Repair the open in the battery positive voltage circuit of the memory function switch. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 16 | |
| 14 | Replace the memory function switch. 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 | |
| 16 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
Memory Seat Feature Inoperative
Power Seats System Description and Operation
The passenger power seat system consists of the following components
- Seat adjuster switch
- Seat horizontal motor
- Seat front vertical motor
- Seat rear vertical motor
- Seat recline motor
- PWR SEATS circuit breaker
Heated Seats Description and Operation
The driver and front passenger heated seats each consist of the following components.
- Heated seat switch
- HVAC control module
- Body control module (BCM)
- Heated seat relay - Driver
- Heated seat relay - Passenger
- Seat cushion heater element
- Seat back heater element
- Temperature sensor
- HTD/SEATS fuse
Heated Seat Operation
The driver and passenger heated seats are controlled by separate heated seat switches. Both switches are located in the HVAC control module. When a heated seat switch is pressed, the HVAC control module sends a class 2 message to the body control module (BCM) indicating the heated seat command. In response to this signal, the BCM applies battery positive voltage through the heated seat relay control circuit energizing the relay. The relay closes its switch contacts applying battery positive voltage through the element supply voltage circuit to the seat heating elements. The BCM then sends a class 2 message back to the HVAC control module to illuminate the appropriate temperature indicator.
Memory Seats Description and Operation
The memory seat system consists of the following components
- Seat adjuster switch
- Memory function switch
- Memory seat module (MSM)
- Seat horizontal motor
- Seat front vertical motor
- Seat rear vertical motor
- Seat recline motor
- Seat horizontal position sensor
- Seat front vertical position sensor
- Seat rear vertical position sensor
- Seat recline position sensor
- PWR SEATS circuit breaker