2010 Cadillac Truck SRX AWD V6-3.0L Page 599
The horn will sound continuously until the horn is disconnected or when the horn overheats and becomes inoperative.
Conditions for Clearing the DTC
* The DTC clears when the fault is no longer detected.
* The current DTC will become history when the request for the output is removed.
* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.
Reference Information
Schematic Reference
Horn Schematics (See: Lighting and Horns/Horn/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Horns System Description and Operation (See: Lighting and Horns/Horn/Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
Circuit/System Verification
Ignition ON, command the P12 horns ON and OFF with the scan tool. The P12 horns should turn ON and OFF when changing between the
commanded states.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the P12 horn.
2. Test for less than 5 ohm between the ground circuit terminal A and ground
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
3. Connect the harness connector at the P12 horn.
4. Connect a 15 A fused jumper wire between the horn fuse test point and B+, verify the P12 horns sound.
瀚慖f the P12 horn does not sound, test the control circuit terminal 9 X3 for a short to ground or an open/high resistance. If the circuit tests
normal, test or replace the P12 horn.
5. Disconnect the X5 harness connector at the K9 BCM.
6. Test for greater than 10 V between the control circuit terminal 19 and ground.
瀚慖f less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the X50A underhood fuse block.
7. Connect a 3 A fused jumper wire between the control circuit terminal 19 and ground, verify the P12 horns sound.
瀚慖f the P12 horn does not sound, test the control circuit for a short to voltage. If the circuit tests normal, replace the X50A underhood fuse
block.
8. If all circuits test normal, replace the K9 BCM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Horn Replacement (See: Lighting and Horns/Horn/Service and Repair)
