Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE - HORN INOPERATIVE
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | With the DRBIII®, actuate the HORN RELAY. Does the Horn sound while actuating the Horn Relay. Yes --> Go To 2 No --> Go To 7 |
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| 2 | Press and hold the Horn button. With the DRBIII® in Inputs/Outputs, read the HORN SW state. Does the DRBIII® display CLOSED? Yes --> Replace the Body Control Module. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 3 |
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| 3 |
WARNING:
Turn the Ignition Off, disconnect the Battery and wait 2 minutes before proceeding.
CAUTION:
Do not place an intact undeployed Airbag face down on a hard surface, the Airbag will propel into the air if accidently deployed. Disconnect the Driver Airbag Module.Disconnect the Horn Switch connector.
WARNING:
Turn the ignition on, then reconnect the battery. Momentarily connect a jumper wire between the Horn/Radio Control MUX circuit and ground at the horn switch connector.Does the horn sound?Yes --> Replace the Horn Switch.Perform BODY VERIFICATION TEST - VER 1 .No --> Go To 4 |
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| 4 | Disconnect the Clockspring C1 connector. Momentarily connect a jumper wire between the Horn/Radio Control MUX circuit at the Clockspring C1 and ground. Does the horn sound? Yes --> Go To 5 No --> Go To 6 |
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| 5 | Disconnect the Clockspring C3 harness connector. Measure the resistance of the Horn/Radio Control MUX circuit between the Horn Switch and Clockspring. Is the resistance below 5.0 ohms? Yes --> Replace the Clockspring. Perform BODY VERIFICATION TEST - VER 1 . No --> Repair the Horn/Radio Control MUX circuit for an open between the Clockspring and the Horn switch. Perform BODY VERIFICATION TEST - VER 1 . |
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| 6 | Disconnect the Body Control Module C1 harness connector. Disconnect the Clockspring C1 harness connector. Measure the resistance of the Horn/Radio Control MUX circuit between the BCM and the Clockspring. Is the resistance below 5.0 ohms? Yes --> Replace the Body Control Module. Perform BODY VERIFICATION TEST - VER 1 . No --> Repair the Horn/Radio Control MUX circuit for an open between the Clockspring and the BCM. Perform BODY VERIFICATION TEST - VER 1 . |
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| 7 | With the DRBIII®, actuate the HORN RELAY. Examine the Horn Relay during the actuation. Does the Horn Relay click while actuating. Yes --> Go To 8 No --> Go To 12 |
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| 8 |
NOTE:
The following test will diagnose the Horn Relay Output circuit. Remove the Horn Relay from the Junction Block.Temporarily remove the Headlamp Delay Relay from the Junction Block.Reinstall the Headlamp Delay Relay in place of the Horn Relay.With the DRBIII®, actuate the HORN RELAY.Does the Horn sound while actuating the Horn Relay?Yes --> Replace the Horn Relay.Perform BODY VERIFICATION TEST - VER 1 .No --> Go To 9 |
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| 9 | Disconnect the jumper wire. Disconnect the Junction Block C2 connector. Connect a jumper wire between the Horn Relay Output circuit at the Junction Block C2 connector and B(+). Does the horn sound with the jumper wire connected? Yes --> Replace the Junction Block. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 10 |
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| 10 | Connect a jumper wire between the Horn Relay Output circuit at the Junction Block C2 connector and B(+). Disconnect the Horn connector. Measure the voltage of the Horn Relay Output circuit at the horn connector. Is the voltage above 10.0 volts? Yes --> Go To 11 No --> Repair the Horn Relay Output circuit for an open. Perform BODY VERIFICATION TEST - VER 1 . |
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| 11 | Disconnect the jumper wire. Disconnect the Horn connector. Measure the resistance of the Ground circuit at the horn connector. Is the resistance below 5.0 ohms? Yes --> Replace the Horn. Perform BODY VERIFICATION TEST - VER 1 . No --> Repair the Ground circuit for an open. Perform BODY VERIFICATION TEST - VER 1 . |
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| 12 | Remove and inspect fuse #8 in the Junction Block. Is the fuse open? Yes --> Inspect/repair the Horn Relay Output circuit for a short to ground. Replace the fuse. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 13 |
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| 13 | Reinstall Fuse #8 in the Junction Block. Remove the Horn Relay from the Junction Block. Temporarily remove the Headlamp Delay Relay from the Junction Block. Reinstall the Headlamp Delay Relay in place of the Horn Relay. With the DRBIII®, actuate the HORN RELAY. Does the Horn sound while actuating the Horn Relay? Yes --> Replace the Horn Relay. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 14 |
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| 14 | Remove the Headlamp Delay Relay from the Horn Relay location in the Junction Block. Reinstall the Headlamp Delay Relay to its original location. Measure the voltage of the Fused B(+) circuits at the Horn Relay connector. Is the voltage above 10.0 volts at each cavity? Yes --> Go To 15 No --> Replace the Junction Block. Perform BODY VERIFICATION TEST - VER 1 . |
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| 15 | Remove the Horn Relay from the junction block. Remove the BCM from the junction block. Connect a jumper wire between the Fused B(+) circuit and the Horn Relay Control circuit at the Horn Relay connector. Measure the voltage of the Horn Relay Control circuit (cavity 7) in the BCM internal connector. Is the voltage above 10.0 volts? Yes --> Replace the Body Control Module. Perform BODY VERIFICATION TEST - VER 1 . No --> Replace the Junction Block. Perform BODY VERIFICATION TEST - VER 1 . |
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