Diagnostic Test

WARNING: This page is about a different car, the 2010 Dodge Charger and 2010 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

VERIFY THAT DTC B121A-RIGHT HEATED SEAT SWITCH HI INDICATOR CONTROL CIRCUIT HIGH IS ACTIVE
1. With the scan tool, record and erase DTC's
2. Operate the Heated Seat Switch in both positions several times.
3. With the scan tool, read DTC's.
  Does the DTC B121A-RIGHT HEATED SEAT HI INDICATOR CONTROL CIRCUIT HIGH reset?
  
  Yes
  - Go to step 2
  No
  - The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
  - Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
DISCONNECT THE RIGHT HEATED SEAT SWITCH AND RE-READ DTC
1. Disconnect the Right Heated Seat Switch connector.
2. With the scan tool erase DTC's
3. Cycle the ignition switch off then back on.
4. With the scan tool, read DTC's.
  Does the DTC B121A-RIGHT HEATED SEAT HI INDICATOR CONTROL CIRCUIT HIGH reset?
  
  Yes
  - Go to step 3
  No
  - Replace the Right Heated Seat switch.
  - Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
DISCONNECT THE CLUSTER C-3 CONNECTOR AND CHECK FOR VOLTAGE

Fig 1: Checking Right Heated Seat High Indicator Driver Circuit For Short To Battery
Courtesy of CHRYSLER LLC
1. Disconnect the Cluster C-3 connector.
  NOTE: Check connectors - Clean and repair as necessary.
2. Turn the ignition on.
3. Measure the voltage at the (P84) Right Heated Seat High Indicator Driver circuit at the Cluster C-3 connector.
  Is there any voltage present?
  
  Yes
  - Repair the (P84) Right Heated Seat High Indicator Driver circuit for a short to battery.
  - Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Replace the Cluster in accordance with the Service Information.
  - Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .