Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Pickup and 2012 RAM Cab & Chassis. 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, except for the Right Front Vented Seat. Attempt to reproduce condition by adjusting the seat.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK (P422) RIGHT SEAT VENT FEED CIRCUIT FOR A SHORT TO VOLTAGE

Fig 1: Checking Right Seat Vent Feed Circuit For Short To Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the HSM C5 harness connector.
  NOTE:
  Check connectors. Clean and repair as necessary.
3. Start the engine and let it run.
4. Measure the voltage between ground and the (P422) Right Seat Vent Feed circuit at the HSM C5 harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (P422) Right Seat Vent Feed circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3.
CHECK (P422) RIGHT SEAT VENT FEED CIRCUIT FOR A SHORT TO VOLTAGE DURING SEAT ADJUSTMENT

Fig 2: Checking Right Seat Vent Feed Circuit For Short To Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Measure the voltage of the (P422) Right Seat Vent Feed circuit between the HSM C5 harness connector and ground while adjusting the seat in all positions.
  Is there any voltage present during the seat adjustment?
  
  Yes
  - Repair the (P422) Right Seat Vent Feed circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Heated Seat Module (HSM) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .