Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Pickup and 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

Possible Causes
(F942) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT OPEN
(C70) BLOWER MOTOR HIGH DRIVER CIRCUIT OPEN
(Z134) GROUND CIRCUIT OPEN
BLOWER MOTOR
A/C HEATER CONTROL
TOTALLY INTEGRATED POWER MODULE (TIPM)

CHECK FOR DTCs IN THE TIPM
1. Turn the ignition on.
2. Using the scan tool, read TIPM DTCs.
  Does the scan tool display any DTCs?
  
  Yes
  - Diagnose and repair the DTCs. Refer to appropriate Diagnostic and Testing Information
  No
  - Go To 2.
CHECK OUTPUT FROM THE TIPM ON THE (F942) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT

Fig 1: Checking Output From The TIPM On The Fused Ignition Switch Output (Run-Start) Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Blower Motor harness connector.
3. Turn the ignition on.
4. With a scan tool in TIPM, select Actuators, and actuate the Blower Motor.
5. Using the 12-volt test light connected to ground, probe the (F942) Fused Ignition Switch Output (Run-Start) circuit in the Blower Motor harness connector.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3.
  No
  - Go To 4.
CHECK (C70) BLOWER MOTOR HIGH DRIVER CIRCUIT AND (Z134) GROUND CIRCUIT FUNCTION

Fig 2: Checking Blower Motor High Driver Circuit And Ground Circuit Function
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Turn the blower control on.
  NOTE:
  The test light should be illuminated and bright. Compared the brightness to that of a direct connection to the battery.
3. Using a 12-volt test light connected to 12 Volts, probe the (C70) Blower Motor High Driver circuit in the Blower Motor harness connector.
  Does the test light illuminate brightly?
  
  Yes
  - Replace the Blower Motor in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500 .
  No
  - Go To 5.
CHECK THE (F942) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT FOR AN OPEN

Fig 3: Checking The Fused Ignition Switch Output (Run-Start) Circuit For An Open
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the TIPM C3 harness connector.
3. Measure the resistance of the (F942) Fused Ignition Switch Output (Run-Start) circuit between the TIPM C3 harness connector and the Blower Motor harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Replace the TIPM in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500 .
  No
  - Repair the (F942) Fused Ignition Switch Output (Run-Start) circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500 .
CHECK THE (C70) BLOWER MOTOR HIGH DRIVER CIRCUIT FOR AN OPEN

Fig 4: Checking The Blower Motor High Driver Circuit For An Open
Courtesy of CHRYSLER LLC
1. Disconnect the A/C Heater Control C2 harness connector.
2. Measure the resistance of the (C70) Blower Motor High Driver circuit between the A/C Heater Control C2 harness connector and the Blower Motor harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 6.
  No
  - Repair the (C70) Blower Motor High Driver circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500 .
CHECK THE (Z134) GROUND CIRCUIT FOR AN OPEN

Fig 5: Checking The Ground Circuit For An Open
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (Z134) Ground circuit between ground and the A/C Heater Control C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Replace the A/C Heater Control in accordance with the Service Information.
  No
  - Repair the (Z134) Ground circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500 .