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• When Monitored: • Set Condition: Possible Causes (X21) HORN CONTROL OUTPUT CIRCUIT SHORTED TO BATTERY VOLTAGE (X22) HORN CONTROL OUTPUT CIRCUIT SHORTED TO BATTERY VOLTAGE (EXPORT) EXCESSIVE RESISTANCE IN THE HORN OR CASE GROUND TOTALLY INTEGRATED POWER MODULE Diagnostic Test 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 2 No >> The conditions that caused this code to set are not present at this time. Using the wiring diagram/sche- matic 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 4 No >> Go To 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 the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CON- No >> Repair the open or excessive resistance at the horn(s) case ground. Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CON- PM HORN SYSTEM - ELECTRICAL DIAGNOSTICS 8H - 7 |