Diagnostic Test

Was the blower control set to high speed for the entire Cool down Test?

Yes 

• Go to step  2

No 

• Start the engine, set the blower control to high speed, and then run the Cool down Test again.
• Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure

Fig 1: Checking Blower Switch Position Signal Circuit For A Short To Ground Circuit

Courtesy of CHRYSLER LLC

1. Turn the ignition off.
2. Disconnect the A/C Heater Control C3 harness connector.
3. Measure the resistance between the (C850) Blower Switch Position Signal circuit and the (Z908) Ground circuit in the A/C Heater Control C3 harness connector.

   Is the resistance below 10K ohms?

   Yes 

   • Repair the (C850) Blower Switch Position Signal circuit for a short to the (Z908) Ground circuit. Run the Cool down Test again after the repair is complete.
   • Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure

   No 

   • Go to step  3

Fig 2: Checking Blower Switch Position Signal Circuit For A Short To Ground Circuit

Courtesy of CHRYSLER LLC

1. Disconnect the A/C Heater Control C1 harness connector.
2. Measure the resistance between the (C850) Blower Switch Position Signal circuit and the (Z909) Ground circuit in the A/C Heater Control C1 harness connector.

   Is the resistance below 10K ohms?

   Yes 

   • Repair the (C850) Blower Switch Position Signal circuit for a short to the (Z909) Ground circuit. Run the Cool down Test again after the repair is complete.
   • Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure

   No 

   • Go to step  4

Fig 3: Checking Blower Switch Position Signal Circuit Voltage

Courtesy of CHRYSLER LLC

1. Reconnect the A/C Heater Control C1 harness connector.
2. Turn the ignition on.
3. Measure the voltage of the (C850) Blower Switch Position Signal circuit.

   Is the voltage above 4.8 volts?

   Yes 

   • Check the blower motor and related circuits for the cause of blower operation problems and repair as necessary. Run the Cool down Test again after the repair is complete.
   • Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure

   No 

   • Go to step  5

Fig 4: Checking Blower Switch Position Signal Circuit For A Short To Ground

Courtesy of CHRYSLER LLC

1. Measure the resistance of the (C850) Blower Switch Position Signal circuit between ground and the A/C Heater Control C3 harness connector.

   Is the resistance below 10K ohms?

   Yes 

   • Repair the (C850) Blower Switch Position Signal circuit for a short to ground. Run the Cool down Test again after the repair is complete.
   • Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure

   No 

   • Go to step  6

Fig 5: Checking Blower Switch Position Signal Circuit For An Open

Courtesy of CHRYSLER LLC

1. Measure the resistance of the (C850) Blower Switch Position Signal circuit between the A/C Heater Control C1 harness connector and the A/C Heater Control C3 harness connector.

   Is the resistance below 5.0 ohms?

   Yes 

   • Replace the A/C Heater Control in accordance with the Service Information. Run the Cool down Test again after the repair is complete.
   • Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure

   No 

   • Repair the (C850) Blower Switch Position Signal circuit for an open. Run the Cool down Test again after the repair is complete.
   • Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure