Diagnostic Test

WARNING: This page is about a different car, the 2014 Dodge Journey. However, it is still accessible from the selected car via links, so may be relevant.

TEST FOR INTERMITTENT CONDITION
NOTE:
Make sure the battery is fully charged and the charging system is operating properly before proceeding.
1. Turn the ignition on.
2. Using a scan tool, record and erase Diagnostic Trouble Codes (DTCs).
3. Turn the ignition off.
4. Start the engine and let it run.
5. Using a scan tool, read DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - The conditions that caused this code to set are not present at this time. Verify seat harness is routed correctly to the HSM. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals. Attempt to reproduce condition by operating all HSM functions one at a time. Attempt to reproduce condition by adjusting the seat.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK (P688) RIGHT FRONT HEATED SEAT TEMP SENSE CIRCUIT FOR A SHORT TO VOLTAGE

Fig 1: Checking Right Front Heated Seat Temp Sense Circuit For Short To Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the HSM C2 harness connector.
  NOTE:
  Check connectors. Clean and repair as necessary.
3. Start the engine and let it run.
4. Measure the voltage of the (P688) Right Front Heated Seat Temp Sense circuit between the HSM C2 harness connector and ground.
  Is there any voltage present?
  
  Yes
  - Repair the (P688) Right Front Heated Seat Temp Sense circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 3
CHECK (P688) RIGHT FRONT HEATED SEAT TEMP SENSE CIRCUIT FOR A SHORT TO VOLTAGE DURING SEAT ADJUSTMENT

Fig 2: Checking Right Front Heated Seat Temp Sense Circuit For Short To Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Measure the voltage of the (P688) Right Front Heated Seat Temp Sense circuit between the HSM C2 harness connector and ground while adjusting the seat in all positions.
  Is there any voltage present during the seat adjustment?
  
  Yes
  - Repair the (P688) Right Front Heated Seat Temp Sense circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 4
CHECK (P688) RIGHT FRONT HEATED SEAT TEMP SENSE CIRCUIT VOLTAGE TO RIGHT SEAT CUSHION HEATER

Fig 3: Checking Right Front Heated Seat Temp Sense Circuit Voltage To Right Seat Cushion Heater
Courtesy of CHRYSLER GROUP, LLC
1. Reconnect the HSM C2 harness connector.
2. Start the engine and let it run.
3. Measure the voltage between the (P688) Right Front Heated Seat Temp Sense circuit and the (P968) Heated Seat Sensor Return circuit at the Right Seat Cushion Heater harness connector.
  Is the voltage above 4.5 volts?
  
  Yes
  - Replace the shorted Seat Cushion Heater Element in accordance with the Service Information. Replace the Seat Cushion Heater Element in accordance with the Service Information. Refer to PAD, HEATER, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 5
CHECK (P688) RIGHT FRONT HEATED SEAT TEMP SENSE CIRCUIT OR AN OPEN

Fig 4: Checking Right Front Heated Seat Temp Sense Circuit For An Open
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the HSM C2 harness connector.
3. Measure the resistance of the (P688) Right Front Heated Seat Temp Sense circuit between the HSM C2 connector and the Right Seat Cushion Heater harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the (P688) Right Front Heated Seat Temp Sense circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK (P968) HEATED SEAT SENSOR RETURN CIRCUIT FOR AN OPEN

Fig 5: Checking Heated Seat Sensor Return Circuit For An Open
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance of the (P968) Heated Seat Sensor Return circuit between the HSM C2 harness connector and the Right Seat Cushion Heater harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Replace the Heated Seat Module (HSM) in accordance with the Service Information. Refer to MODULE, HEATED SEAT, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the (P968) Heated Seat Sensor Return circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .