2010 Cadillac CTS Sedan AWD V6-3.6L Page 519
4. Install a 3 A fused jumper wire between the signal circuit terminal D and the low reference circuit terminal C. Verify the scan tool Ambient
Light Sensor parameter is less than 0.196 V.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage an open/high resistance. If the circuit tests normal, replace
the BCM.
5. If all circuits test normal, replace the ambient light/sunload sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Headlamp Automatic Control Ambient Light Sensor Replacement (See: Lighting and Horns/Headlamp/Headlamp Dimmer Sensor/Service
and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning)for BCM or HVAC control module replacement,
setup, and programming
B2652
DTC B2652
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B2652 00
- Passenger Compartment Dimming 3 Circuit
Diagnostic Fault Information
Circuit/System Description
The instrument panel (I/P) lamp dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The I/P
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.
* Park lamps ON.
Conditions for Setting the DTC
DTC B2652 00 will set for the following conditions:
