Diagnostic Test

WARNING: This page is about a different car, the 2015 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.

TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. Using a scan tool, read the DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 2
  No
  - Test complete. The conditions that caused this code to set are not present at this time. Verify seat harness is routed correctly to the BCM. 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.
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - EXCEPT ELECTRIC .
CHECK THE (P134) PASSENGER HEATED SEAT RELAY CONTROL CIRCUIT FOR A SHORT TO BATTERY
1. Turn the ignition off.
2. Disconnect the Passenger Heated Seat Relay.
3. Disconnect the BCM C1 harness connector.
4. Turn the ignition on.
5. Measure the voltage on the (P134) Passenger Heated Seat Relay Control circuit.
  Is there any voltage present?
  
  Yes
  - Repair the (P134) Passenger Heated Seat Relay Control circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - EXCEPT ELECTRIC .
  No
  - Go To 3
CHECK FOR CORRECT BCM OPERATION
1. Connect the BCM C1 harness connector.
2. Using a 12-volt test light, connected to 12-volts, test the (P134) Passenger Heated Seat Relay Control circuit.
3. With the scan tool, actuate the Passenger Heated Seat Relay.
  Does the test light illuminate with the relay on and extinguish with the relay off?
  
  Yes
  - Replace the Passenger Heated Seat Relay according to the service information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - EXCEPT ELECTRIC .
  No
  - Replace the Body Control Module (BCM) according to the service information. Refer to MODULE, BODY CONTROL, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY CONTROL MODULE (BCM) - BODY VERIFICATION TEST - 500 - EXCEPT ELECTRIC .