Thursday, May 13, 2021

2010 Cadillac CTS Sedan AWD V6-3.6L Page 368

2010 Cadillac CTS Sedan AWD V6-3.6L Page 368



dimmer switch provides a voltage signal that will increase as the brightness of the lights are increased and decrease as the brightness of the lights



are decreased. The body control module (BCM) provides a low reference signal and a B+ voltage reference to the I/P dimmer switch. When the I/P



dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the I/P dimmer switch through the I/P dimmer switch



signal circuit to the BCM. The BCM interprets the signal and applies the dimmed voltage to the I/P lamps supply voltage circuit and the interior



backlighting components dim to the requested level.



Conditions for Running the DTC



Battery voltage must be between 9-16 V.



Conditions for Setting the DTC



B1395 03



The DTC will set for the following conditions:



* The BCM detects a short to ground in the I/P dimmer switch voltage reference circuit.



* The BCM detects a short to ground in the I/P dimmer switch signal circuit.



* The BCM detects a short to ground or an open/high resistance in the BCM 1 fuse B+ circuit.



B1395 07



The BCM detects a short to voltage in the I/P dimming voltage reference circuit or the vehicles system voltage exceeds the normal operating range



of 16 V.



Actions Taken When the DTC Sets



* The I/P dimmer switch will not operate.



* The I/P dimming lamps will not illuminate.



Conditions for Clearing the DTC



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



* A history DTC will clear once 100 consecutive malfunction-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)



Connector End View Reference



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



Description and Operation



Interior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Interior Lighting Systems Description



and Operation)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit



Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/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, cover the ambient light sensor, vary the interior lamp dimming switch from dim to full bright. The lamps should dim and then become



full bright.



Circuit/System Testing



1. Ignition OFF, disconnect the harness connector at the I/P Dimmer switch.



2. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal 10.



瀚慖f the test lamp does not illuminate, test the ground circuit for an open/high resistance.

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