Horn System - Electrical Diagnostics: Other Jeep Compass I

Monitor Conditions

1. When Monitored: Continuously.

Set Conditions

1. Set Condition: The Cluster senses that the Horn switch is in the Set position for greater than 50 seconds.

Possible Causes

Scheme 2

Scheme 3

Scheme 4

1. VERIFY DTC B2339 - HORN SWITCH STUCK IS ACTIVE With the scan tool, erase CCN DTCs. Operate the Horn Switch several times. Wait 1 minute. With the scan tool, read CCN DTCs. Does the scan tool display active DTC B2339-HORN SWITCH STUCK? Yes Go To 2 . No Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, corroded, or contaminated terminals. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .
2. HORN SWITCH WARNING: Turn the ignition off, disconnect the battery and wait two minutes before proceeding. WARNING: Do not place an intact undeployed airbag face down on a hard surface, the airbag will propel into the air if accidentally deployed, and could results in serious or fatal injury. Remove the Driver Airbag in accordance with the Service information. Disconnect the Steering Control Module C5 connector. NOTE: Before proceeding, thoroughly inspect the wiring harness and connectors between the Horn Switch for a short to ground or to any other circuit. Measure the resistance between the (X3) Horn Switch Sensor circuit at the C5 connector to the Radio Control Return. Is the resistance below 5.0 ohms? Yes Replace the Horn Switch in accordance with the Service Information. No Go to 3 .
3. CLOCKSPRING Disconnect the Steering Control Module C2 connector. With the scan tool, erase CCN DTCs. Wait 1 minute. With the scan tool, read CCN DTCs. Does the scan tool display active DTC B2339 - HORN SWITCH STUCK? Yes Go To 4 . No Replace the Steering Control Module in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .
4. (X3) HORN SWITCH SIGNAL CIRCUIT SHORT TO GROUND Disconnect the Cluster C3 connector. Measure the resistance between ground and the (X3) Horn Switch circuit. Is the resistance below 5.0 ohms? Yes Repair the (X3) Horn Switch circuit for a short to ground. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Replace the Cluster in accordance with the Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .

1. When Monitored: With the ignition on. Battery voltage greater than 10.4 volts.

1. Set Condition: A shorted low condition on the (X21)/(X22) Horn Control Output circuit.

Scheme 5

Scheme 6

1. VERIFY DTC B2336-HORN CONTROL CIRCUIT LOW IS ACTIVE With the scan tool, erase TIPM DTCs. Operate the Horn Switch several times. With the scan tool, read TIPM DTCs. Does the scan tool display active DTC B2336-HORN CONTROL CIRCUIT LOW? Yes Go To step 2 . No Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, corroded, or contaminated terminals. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .
2. (X21)/(X22) HORN CONTROL OUTPUT CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the horn connector(s). Disconnect the C11 TIPM harness connector. Measure the resistance between ground and the Horn Control Output circuit(s) at the horn connector(s). Is the resistance below 100 ohms? Yes Repair the (X21)/(X22) Horn Control Output circuit for a short to ground. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Go To step 3 .
3. HORN Connect the C11 TIPM harness connector. Turn the ignition on, engine not running. Using the scan tool under the TIPM Actuators, actuate the Horn. With a 12-volt test light connected to ground, probe the Horn Control Output circuit at the Horn connector(s). Does the test light illuminate brightly and flash on and off? Yes Replace the Horn(s) as necessary per Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Go To step 4 .
4. TOTALLY INTEGRATED POWER MODULE NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were any problems found? Yes Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Replace the Totally Integrated Power Module per Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .

1. When Monitored: With the ignition on. Battery voltage greater than 10.4 volts.

1. Set Condition: A shorted high condition in the (X21)/(X22) Horn Control Output circuit.

Scheme 7

1. CHECK FOR ACTIVE DTC B2337 - HORN CONTROL CIRCUIT HIGH IN THE TIPM Turn the ignition on. With the scan tool, record and erase DTC's. Operate the Horn Switch several times. With the scan tool, read DTC's. Does the scan tool display active DTC B2337-HORN CONTROL CIRCUIT HIGH? 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.
2. CHECKING THE HORN(S) Turn the ignition off. Disconnect the Horn(s) connector(s). Momentarily jumper 12-volts to the horn(s). Did the horn(s) operate properly? Yes Go To step 4 . No Go To step 3 .
3. CASE GROUND CIRCUIT OPEN Using a 12-volt test light connected to 12-volts, check for a good case ground at the horn(s) case. Does the test light illuminate brightly? Yes Replace the Horn(s) as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Repair the open or excessive resistance at the horn(s) case ground. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .
4. (X21)/(X22) HORN CONTROL OUTPUT CIRCUIT SHORTED TO BATTERY VOLTAGE Turn the ignition off. Disconnect the C11 TIPM harness connector. Ignition on, engine not running. Measure the voltage between (X21)/(X22) Horn Control Output circuit(s) and ground at the horn connector(s). Is there any voltage present? Yes Repair the short to battery voltage in the (X21)/(X22) Horn Control Output circuit. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Go To step 5 .
5. TOTALLY INTEGRATED POWER MODULE NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were any problems found? Yes Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Replace the Totally Integrated Power Module per Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .

1. When Monitored: With the ignition on. Battery voltage greater than 10.4 volts.

1. Set Condition: An open condition on the (X21)/(X22) Horn Control Output circuit.

Scheme 8

1. CHECK FOR ACTIVE DTC B2338-HORN CONTROL CIRCUIT OPEN Turn the ignition on. With the scan tool, record and erase DTC's. Operate the horn switch several times. With the scan tool, read DTC's. Does the scan tool display active DTC B2338-HORN CONTROL CIRCUIT OPEN? 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.
2. VISUAL AND PHYSICAL CONNECTOR AND TERMINAL INSPECTION Turn the ignition off. 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. Disconnect the horn connectors. Disconnect the C11 TIPM harness connector. 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 «PCM VERIFICATION TEST»(ref-304396-S07357759032008110700000) . No Go To step 3 .
3. (X21)/(X22) HORN CONTROL OUTPUT CIRCUIT OPEN NOTE: Cavity 8 at the C11 TIPM harness connector is for export vehicles only. Turn the ignition off. Measure the resistance of the (X21)/(X22) Horn Control Output circuit between the C11 TIPM harness connector and the Horn connector(s). Is the resistance below 5.0 ohms? Yes Go To step 4 . No Repair the (X21)/(X22) Horn Control Output circuit for an open. Perform «PCM VERIFICATION TEST»(ref-304396-S07357759032008110700000) .
4. CHECKING HORN OPERATION Turn the ignition off. Disconnect the horn(s) connector(s) if not disconnected. Momentarily jumper 12-volts to the horn(s). Did the horn(s) operate properly? Yes Go To step 6 . No Go To step 5 .
5. CASE GROUND CIRCUIT OPEN Using a 12-volt test light connected to 12-volts, check for a good case ground at the horn(s) case. Does the test light illuminate brightly? Yes Replace the Horn(s) as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Repair the open or excessive resistance at the horn(s) case ground. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .
6. TOTALLY INTEGRATED POWER MODULE NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were any problems found? Yes Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Replace the Totally Integrated Power Module per Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .

1. When Monitored: With the ignition on. Battery voltage greater than 10.4 volts.

1. Set Condition: An overcurrent condition in the (X21)/(X22) Horn Control Output circuit.

Scheme 9

1. CHECK FOR ACTIVE DTC B2371 HORN CONTROL CIRCUIT OVERCURRENT Turn the ignition on. With the scan tool, record and erase DTC's. Operate the Horn Switch several times. 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.
2. VISUAL AND PHYSICAL CONNECTOR AND TERMINAL INSPECTION Turn the ignition off. 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. Disconnect the Horn connectors. Disconnect the C11 TIPM harness connector. 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 «PCM VERIFICATION TEST»(ref-304396-S07357759032008110700000) . No Go To step 3 .
3. (X21)/(X22) HORN CONTROL OUTPUT CIRCUIT HIGH RESISTANCE With a jumper wire, connect one end to the (X21) Horn Control Output circuit at the Horn connector and the other to a clean chassis ground. Using a 12-volt test light to battery voltage, probe the (X21) Control Output circuit in the C11 TIPM harness connector. NOTE: Cavity 8 at the C11 TIPM harness connector is for export vehicles only. 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. Compare 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 «PCM VERIFICATION TEST»(ref-304396-S07357759032008110700000) .
4. CHECKING HORN OPERATION Turn the ignition off. Disconnect the horn(s) connector(s) if not disconnected. Momentarily jumper 12-volts to the horn(s). Did the horn(s) operate properly? Yes Go To step 6 . No Go To step 5 .
5. CASE GROUND CIRCUIT OPEN Using a 12-volt test light connected to 12-volts, check for a good case ground at the horn(s) case. Does the test light illuminate brightly? Yes Replace the Horn(s) as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Repair the open or excessive resistance at the horn(s) case ground. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .
6. TOTALLY INTEGRATED POWER MODULE NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were any problems found? Yes Repair as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) . No Replace the Totally Integrated Power Module per Service Information. Perform «BODY VERIFICATION TEST - VER 1»(ref-304334-S29410035802008110700000) .