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 B121B-RIGHT HEATED SEAT HI INDICATOR CONTROL CIRCUIT OPEN 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 B121B-RIGHT HEATED SEAT HI INDICATOR CONTROL CIRCUIT OPEN 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 .
INSPECT PDC FUSES
1. Check PDC fuses #8 and #40.
  Is either fuse open?
  
  Yes
  - Check for a possible short to ground on the (F23) Fused Ignition Switch Output (Run-Start) Circuit and replace the fuse as necessary.
  - Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Go to step 3
DISCONNECT THE CLUSTER C3 CONNECTOR AND CHECK FOR VOLTAGE

Fig 1: Checking Right Heated Seat High Indicator Driver Circuit For Short To Battery
Courtesy of CHRYSLER LLC
1. Reinstall fuse if removed in previous test.
2. Disconnect the Cluster C3 connector.
  NOTE: Check connectors - Clean and repair as necessary.
3. Turn the ignition on.
4. Measure the voltage at the (P84) Right Heated Seat High Indicator Driver circuit at the Cluster C3 connector.
  Is the voltage above 10.0 volts?
  
  Yes
  - 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 .
  No
  - Go to step 4
CHECK THE (F23) FUSED IGNITION SWITCH OUTPUT (RUN-START)

Fig 2: Checking Fused Ignition Switch Output (Run-Start ) Circuit For Open
Courtesy of CHRYSLER LLC
1. Disconnect the Right Heated Seat switch connector.
  NOTE: Check connectors - Clean and repair as necessary.
2. Turn the ignition on.
3. Measure the voltage of the (F23) Fused Ignition Switch Output (Run-Start ) circuit at the Right Heated Seat Switch connector.
  Is the voltage above 10.0 volts ?
  
  Yes
  - Go to step 5
  No
  - Repair the (F23) Fused Ignition Switch Output (Run-Start ) circuit for an open.
  - Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
CHECK THE (P84) RIGHT HEATED SEAT HIGH INDICATOR DRIVER CIRCUIT FOR A SHORT TO GROUND

Fig 3: Checking Right Heated Seat High Indicator Driver Circuit For Short To Ground
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (P84) Right Heated Seat High Indicator Driver circuit.
  Was the resistance below 5.0 ohms?
  
  Yes
  - Repair the (P84) Right Heated Seat High Indicator Driver circuit for a short to ground
  - Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Go to step 6
CHECK THE (P84) RIGHT HEATED SEAT HIGH INDICATOR DRIVER CIRCUIT FOR AN OPEN

Fig 4: Checking Right Heated Seat High Indicator Driver Circuit For Open
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (P84) Right Heated Seat High Indicator Driver circuit between the Cluster C3 connector and the Right Heated Seat Switch connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Replace the Right Heated Seat Switch.
  - Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Repair the (P84) Right Heated Seat High Indicator Driver circuit for an open.
  - Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .