Horns Inoperative
HORNS INOPERATIVE
For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams
1. RELATED DTC'S
1. Turn the ignition on.
2. With the scan tool, read the current Body Control Module DTCs.
Does the scan tool display any Horn related DTCs?
Yes
- Refer to Ignition, Power, Accessory for the related symptom(s).
- Perform the BODY VERIFICATION TEST. Body Verification Test
No
- Go To 2
2. ACTUATE HORN RELAY
1. With the scan tool, actuate the Horn Relay.
Do the horns operate?
Yes
- Go To 3
No
- Go To 7
3. HORN SWITCH GROUND
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 RESULT IN SERIOUS OR FATAL INJURY.
1. Gain access to the horn switch.
2. Inspect the Horn Switch ground circuit.
Is the Horn Switch ground wire connected properly?
Yes
- Go To 4
No
- Repair the horn switch ground as necessary.
- Perform the BODY VERIFICATION TEST. Body Verification Test
4. HORN SWITCH
WARNING: TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO 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 ACCIDENTALLY DEPLOYED, AND COULD RESULT IN SERIOUS OR FATAL INJURY.
1. Gain access to the horn switch connector.
WARNING: TURN THE IGNITION ON, THEN RECONNECT THE BATTERY.
2. Momentarily connect a jumper wire between the (X3) Horn Switch Sense circuit at the horn switch pigtail connector and ground.
Did the horns sound?
Yes
- Repair or replace the wiring/horn switch as necessary.
- Perform the BODY VERIFICATION TEST. Body Verification Test
No
- Go To 5
5. CLOCKSPRING
1. Disconnect the clockspring C1 connector.
2. Momentarily connect a jumper wire between the (X3) Horn Switch Sense circuit at the clockspring connector and ground.
Did the horns sound?
Yes
- Replace the clockspring.
- Perform the BODY VERIFICATION TEST. Body Verification Test
No
- Go To 6
6. (X3) HORN SWITCH SENSE
1. Disconnect the clockspring C1 connector.
2. Disconnect the Body Control Module C2 connector.
NOTE: Check connectors - Clean/repair as necessary.
3. Measure the resistance of the (X3) Horn Switch Sense circuit between the clockspring C1 connector and the Body Control Module C2 connector.
Is the resistance below 5.0 ohms?
Yes
- Replace the Body Control Module.
- Perform the BODY VERIFICATION TEST. Body Verification Test
No
- Repair the (X3) Horn Switch Sense circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test
7. INSTALL KNOWN GOOD RELAY
1. Turn the ignition off.
2. Remove the Horn Relay from the Power Distribution Center.
3. Substitute the original Horn Relay with a known good relay.
4. Turn the ignition on.
5. With the scan tool actuate the Horn Relay.
Do the Horns operate?
Yes
- Replace the original Horn Relay.
- Perform the BODY VERIFICATION TEST. Body Verification Test
No
- Go To 8
8. (X2) HORN RELAY OUTPUT CIRCUIT OPEN
1. Disconnect each horn connector.
2. With the scan tool, actuate the horn relay.
3. Using a 12-volt test light connected to ground, check for voltage at the (X2) Horn Relay Output circuit at each horn connector.
Does the test light illuminate brightly at both connectors?
Yes
- Go To 9
No
- Repair the (X2) Horn Relay Output circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test
9. (Z936) HORN GROUND CIRCUIT OPEN
1. Disconnect the Horn connector.
2. Using a 12-volt test light connected to 12-volts, check the (Z936) Ground circuits in the horn connectors.
Does the test light illuminate brightly?
Yes
- Replace the Horns as necessary.
- Perform the BODY VERIFICATION TEST. Body Verification Test
No
- Repair the (Z936) Ground circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test