Diagnostic Test

CHECK FOR ACTIVE DTC B2371-HORN CONTROL CIRCUIT OVERCURRENT
1. Turn the ignition on.
2. With the scan tool, record and erase DTC's
3. Operate the Horn Switch several times.
4. With the scan tool, read DTC's.
  Does the scan tool display active DTC B2371-HORN CONTROL CIRCUIT OVERCURRENT?
  
  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. See DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
VISUAL AND PHYSICAL CONNECTOR AND TERMINAL INSPECTION
1. Turn the ignition off.
2. Inspect the following connector terminal condition. Check for signs of corrosion build up or damage that would compromise the terminal to controller pin connector.
  NOTE: Make sure that all in-line connectors are inspected for corrosion and/or damage.
3. Disconnect the Horn connectors.
4. Disconnect the C11 TIPM harness connector.
5. Visually inspect the wiring harness. Look for any chafed, pierced, pinched or partially broken wires hidden in the wire insulation.
  Were any of the above conditions found?
  
  Yes
  - Repair or replace as necessary.
  - Perform BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Go to step 3
(X21)/(X22) HORN CONTROL OUTPUT CIRCUIT HIGH RESISTANCE

Fig 1: Checking Horn Control Output Circuit
Courtesy of CHRYSLER LLC
1. With a jumper wire, connect one end to the (X21) Horn Control Output circuit at the Horn C1 connector and the other to a clean chassis ground.
2. Using a 12-volt test light to battery voltage, probe the (X21) Control Output circuit in the C11 TIPM harness connector.
  NOTE: If this is an export vehicle, follow the previous steps for the (X22) Horn Control Circuit also.
  
  NOTE: The test light should be illuminated and bright. Compared the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly?
  
  Yes
  - Go to step 4
  No
  - Repair the excessive resistance in the Horn Control Output circuit.
  - Perform BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
CHECKING THE HORN AND (Z904) GROUND CIRCUIT
1. Turn the ignition off.
2. Disconnect the Horn(s) C1 connector(s) if not disconnected.
3. Momentarily jumper 12-volts to the horn(s).
  Did the horn(s) operate properly?
  
  Yes
  - Go to step 6
  No
  - Go to step 5
(Z904) GROUND CIRCUIT OPEN

Fig 2: Checking Horn Control Ground Circuit
Courtesy of CHRYSLER LLC
1. Disconnect the Horn(s) C2 connector(s).
2. Using a 12-volt test light connected to 12-volts, probe the (Z904) ground circuit at the C2 connector(s).
  Does the test light illuminate brightly?
  
  Yes
  - Replace the Horn(s) as necessary.
  - Perform BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Repair the open or excessive resistance in the (Z904) Ground circuit.
  - Perform BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
TOTALLY INTEGRATED POWER MODULE
NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
1. Using the schematics as a guide, inspect the wire harness and connectors.
2. Pay particular attention to all Power and Ground circuits.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Replace the Totally Integrated Power Module in accordance with the Service Information.
  - Perform BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .