Diagnostic Test

WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, clear all DTCs.
3. Operate the Heated Seat Switch in both positions several times.
  NOTE:
  Check connectors - Clean and repair as necessary.
4. With the scan tool, read DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 2
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
  - Perform BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
(P187) LEFT FRONT SEAT HEATER CONTROL CIRCUIT SHORTED TO VOLTAGE

Fig 1: Checking Left Front Seat Heater Control Circuit For A Short To Voltage
Courtesy of CHRYSLER GROUP, LLC
1. Disconnect the Heated Seat Module harness connector.
2. Turn the ignition on.
3. Measure the voltage on the (P187) Left Front Seat Heater Control circuit.
  Is there voltage above 0.5 volts?
  
  Yes
  - Repair the (P187) Left Front Seat Heater Control circuit for a short to voltage.
  - Perform BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 3
(P187) LEFT FRONT SEAT HEATER CONTROL CIRCUIT OPEN

Fig 2: Checking Seat Heater Element For A Short
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Measure the resistance of the (P187) Left Front Seat Heater Control circuit at the Heated Seat Module harness connector to chassis ground.
  Is the resistance between 2 and 5 Ohms?
  
  Yes
  - Replace the Heated Seat Module in accordance with the Service Information.
  - Perform BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 4
(Z912) SEAT HEATER GROUND CIRCUIT OPEN
1. Measure the resistance between ground and the (Z912) Seat Heater Ground circuit.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the open or excessive resistance in the (Z912) Seat Heater ground circuit.
  - Perform BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Check the heater wiring in the driver seat harness for an open, if OK replace the open seat heater element(s) in accordance with the Service Information.
  - Perform BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .