Tuesday, August 18, 2020

2010 Cadillac Truck SRX AWD V6-3.0L Page 301

2010 Cadillac Truck SRX AWD V6-3.0L Page 301



then applies a pulse width modulated (PWM) voltage to the LED dimming supply circuit to all related interior lamps, illuminating them to the



desired level of brightness.



Conditions for Running the DTC



The ignition is ON.



Conditions for Setting the DTC



B1405 03, B1529 03, or B257B 03



The BCM detects less than 0.3 V on the dimmer switch signal circuit.



B1405 07, B1529 07, or B257B 07



The BCM detects a voltage greater than 12.2 V on dimmer switch signal circuit.



Action Taken When the DTC Sets



The BCM will not dim or illuminate any LED backlighting supplied by the backlight lamp control circuits.



Conditions for Clearing the DTC



* The condition responsible for setting the DTC no longer exists.



* A history DTC will clear once 100 consecutive fault free ignition cycles have occurred.



Reference Information



Schematic Reference



* Interior Lights Dimming Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Interior Lights Dimming



Schematics)



* Steering Wheel Secondary/Configurable Control Schematics (See: Accessories and Optional Equipment/Diagrams/Electrical



Diagrams/Steering Wheel Secondary/Configurable Control Schematics)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)



Description and Operation



Interior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Interior 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, headlamps ON, vary the interior backlight dimming from low to full bright by using the dimmer switch. The interior backlighting



should start dim and then become full bright.



Circuit/System Testing



1. Ignition OFF, disconnect the harness connector at the S30 headlamp switch.



2. Test for less that 10 Ohms between the ground circuit terminal 6 and ground.



瀚慖f greater than the specified range, test the ground circuit for an open high/resistance.



3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.



瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace