Diagnostic Test

WARNING: This page is about a different car, the 2009 Dodge Sprinter. However, it is still accessible from the selected car via links, so may be relevant.

ERASE AND ATTEMPT TO RESET DTC'S
1. Turn the ignition on.
2. With the scan tool, record and erase BCM DTCs.
3. Turn the ignition off, wait 10 seconds then turn the ignition on.
4. Attempt to operate the horn.
5. With the scan tool, read BCM DTCs.
  Does the scan tool display 9075-HORN CONTROL CIRCUIT HIGH?
  
  Yes
  - Go to step 2
  No
  - The condition that caused this symptom is currently not present. Inspect the related wiring harness for a possible intermittent condition.
  - Perform BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Body Control (BCM) - Standard Procedure .
INSTALL KNOWN GOOD RELAY
1. Turn the ignition off.
2. Remove the Horn Relay from the Fuse and Relay Block.
3. Substitute the original Horn Relay with a known good relay.
4. Turn the ignition on.
5. With the scan tool, erase BCM DTCs.
6. Turn the ignition off, wait 10 seconds, then turn the ignition on.
7. operate the horn switch.
8. With the scan tool, read BCM DTCs.
  Does the scan tool display 9075-HORN CONTROL CIRCUIT HIGH?
  
  Yes
  - Go to step 3
  No
  - Replace the original Horn Relay in accordance with the Service Information.
  - Perform BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Body Control (BCM) - Standard Procedure .
HORN RELAY CONTROL CIRCUIT
1. Turn the ignition off.
2. Disconnect the BCM from the Fuse and Relay Block.
3. Remove the Horn Relay from the Fuse and Relay Block.
4. Turn the ignition On.
5. Measure the Voltage of the Horn Relay Control circuit at the relay.
  Is the Voltage above 1.0 Volt?
  
  Yes
  - Replace the Fuse and Relay Block in accordance with the Service Information.
  - Perform BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Body Control (BCM) - Standard Procedure .
  No
  - Replace the Body Control Module (BCM) in accordance with the Service Information.
  - Perform BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Body Control (BCM) - Standard Procedure .