2010 Cadillac Truck SRX AWD V6-3.0L Page 696
The BCM detects a short to ground in the headlamp flash to pass signal circuit for greater than 15 seconds.
Action Taken When the DTC Sets
The high beam headlamps will malfunction.
Conditions for Clearing the DTC
* The DTC will be current for as long as the fault is present.
* When the fault is no longer present, the DTC will be a history DTC.
* A history DTC will clear after 50 ignition cycles.
Reference Information
Schematic Reference
Headlights/Daytime Running Lights (DRL) Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System
Diagram/Headlights/Daytime Running Lights (DRL) Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Exterior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Exterior Lighting Systems)
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, observe the scan tool Headlamps Flash Switch parameter while pulling and releasing the turn signal/multifunction switch. The value
should change between Inactive and Active when changing between the selected states.
Circuit/System Testing
1. Ignition OFF, disconnect at the S78 turn signal/multifunction switch.
2. Ignition ON, verify that the scan tool Headlamps Flash Switch parameter is Inactive.
瀚慖f not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the K9 BCM.
3. Connect a 3 A fused jumper wire between the signal circuit terminal 4 and ground, verify that the scan tool Headlamps Flash Switch
parameter is Active.
瀚慖f not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9
BCM.
4. If all circuits test normal, test or replace the S78 turn signal/multifunction switch.
Component Testing
Turn Signal/Multifunction Switch Test
1. Ignition OFF, disconnect the harness connector at the S78 turn signal/multifunction switch.
2. Test for Infinite resistance between the terminals listed below with the switch in the open position.
* Signal terminal 2 and ground terminal 3
* Signal terminal 4 and ground terminal 3
瀚慖f not the specified value, replace the S78 turn signal/multifunction switch.
