2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 683
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 High Beam Select Switch parameter while pulling and releasing the turn signal/multi-function 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 High Beam Select Switch parameter is Inactive.
瀚慖f not the specified value, test the signal circuit terminal 2 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 2 and ground, verify that the scan tool High Beam Select 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.
3. Test for less than 2 ohm between the signal terminal 2 and the ground terminal 3 with the switch in the high beam position.
瀚慖f greater than the specified value, replace the S78 turn signal/multifunction switch.
4. Test for less than 2 ohm between the signal terminal 4 and the ground terminal 3 while holding the switch in the flash to pass position.
瀚慖f greater than the specified value, replace the S78 turn signal/multifunction switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Turn Signal Multifunction Switch Replacement (See: Lighting and Horns/Sensors and Switches - Lighting and Horns/Turn Signal
Switch/Service and Repair/Turn Signal Multifunction Switch Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning)for BCM replacement, programming and setup
