Diagnostic Test

TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. Using a scan tool, record and erase Diagnostic Trouble Codes (DTCs).
3. Operate the Horn Switch several times.
4. Cycle the ignition from on to off three times and leave on.
5. Using a scan tool, read DTCs.
  Does the scan tool display DTC B2336-HORN CONTROL CIRCUIT LOW?
  
  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 the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
CHECK FOR OPEN HORN FUSE

Fig 1: Checking For Open Horn Fuse
Courtesy of CHRYSLER LLC
1. Inspect the Horn Fuse.
  Is the fuse open?
  
  Yes
  - Go to step 3
  No
  - Go to step 9
REPLACE AND RECHECK HORN FUSE

Fig 2: Checking For Open Horn Fuse
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Install a new Horn Fuse.
3. Turn the ignition on.
4. Operate the Horn Switch several times.
5. Inspect the Horn Fuse.
  Is the fuse open?
  
  Yes
  - Go to step 4
  No
  - Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for the cause of the open fuse and repair as necessary.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
CHECK (A950) FUSED B(+) CIRCUIT FOR A SHORT TO GROUND

Fig 3: Checking Fused B(+) Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Remove the Horn Fuse.
3. Remove the Horn Relay.
4. Measure the resistance of the (A950) Fused B(+) circuit between ground and the Horn Relay connector.
  Is the resistance below 10K Ohms?
  
  Yes
  - Replace the Integrated Power Module (IPM) and the Horn Fuse in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go to step 5
CHECK (X2) HORN RELAY OUTPUT CIRCUIT FOR A SHORT TO GROUND

Fig 4: Checking (X2) Horn Relay Output Circuit
Courtesy of CHRYSLER LLC
1. Disconnect the Horn 1 and Horn 2 connector.
  NOTE: Check connectors. Clean and repair as necessary.
2. Measure the resistance of the (X2) Horn Relay Output circuit between ground and the Horn Relay connector.
  Is the resistance below 10K Ohms?
  
  Yes
  - Go to step 6
  No
  - Go to step 7
CHECK (X2) HORN RELAY OUTPUT CIRCUIT IN IPM FOR A SHORT TO GROUND

Fig 5: Checking (X2) Horn Relay Output Circuit
Courtesy of CHRYSLER LLC
1. Disconnect the IPM C2 connector.
  NOTE: Check connectors. Clean and repair as necessary.
2. Measure the resistance of the (X2) Horn Relay Output circuit between ground and the Horn Relay connector.
  Is the resistance below 10K Ohms?
  
  Yes
  - Replace the Integrated Power Module (IPM) and the Horn Fuse in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Repair the (X2) Horn Relay Output circuit for a short to ground. Replace the Horn Fuse.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
CHECK FOR A SHORTED HORN RELAY
1. Reconnect the Horn 1 and Horn 2 connector.
2. Install a known good relay in place of the Horn Relay.
3. Install a new Horn Fuse.
4. Turn the ignition on.
5. Operate the Horn Switch several times.
6. Inspect the Horn Fuse.
  Is the fuse open?
  
  Yes
  - Go to step 8
  No
  - Replace the original Horn Relay in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
CHECK FOR A SHORTED HORN

Fig 6: Checking For A Shorted Horn
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Horn 1 connector.
3. Install a new Horn Fuse.
4. Turn the ignition on.
5. Operate the Horn Switch several times.
6. Inspect the Horn Fuse.
  Is the fuse open?
  
  Yes
  - Replace Horn 2 and the Horn Fuse in accordance with the Service Information. Reinstall the original Horn Relay.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Replace Horn 1 in accordance with the Service Information. Reinstall the original Horn Relay.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
CHECK (A1) B(+) CIRCUIT FOR AN OPEN

Fig 7: Checking B(+) Circuit For An Open
Courtesy of CHRYSLER LLC
1. If not done previously, turn the ignition off, and then remove the Horn Fuse.
2. Turn the ignition on.
3. Using a 12-volt test light connected to ground, check the (A1) B(+) circuit at the Horn Fuse connector.
  NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly?
  
  Yes
  - Go to step 10
  No
  - Repair the (A1) B(+) circuit for an open.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
CHECK (A950) FUSED B(+) CIRCUIT FOR AN OPEN

Fig 8: Checking Fused B(+) Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Remove the Horn Relay.
3. Reinstall the Horn Fuse.
4. Turn the ignition on.
5. Using a 12-volt test light connected to ground, check the (A950) Fused B(+) circuit at the Horn Relay connector.
  NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly?
  
  Yes
  - Go to step 11
  No
  - Replace the Integrated Power Module (IPM) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
CHECK FOR AN OPEN HORN RELAY
1. Turn the ignition off.
2. Install a known good relay in place of the Horn Relay.
3. Using a scan tool, erase DTCs.
4. Operate the Horn Switch several times.
5. Cycle the ignition from on to off three times and leave on.
6. Using a scan tool, read DTCs.
  Does the scan tool display the same DTC?
  
  Yes
  - Go to step 12
  No
  - Replace the original Horn Relay in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
CHECK (X4) HORN RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND

Fig 9: Checking Horn Relay Control Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Remove the replacement Horn Relay.
3. Disconnect the FCM from the Front Control Module IPM 49-way connector.
4. Measure the resistance of the (X4) Horn Relay Control circuit between ground and the Horn Relay connector.
  Is the resistance below 10K Ohms?
  
  Yes
  - Replace the Integrated Power Module (IPM) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go to step 13
CHECK (X4) HORN RELAY CONTROL CIRCUIT FOR AN OPEN

Fig 10: Checking Horn Relay Control Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (X4) Horn Relay Control circuit between the Relay connector and the Front Control Module IPM 49-way connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Replace the Front Control Module (FCM) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Replace the Integrated Power Module (IPM) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .