2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 283

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 283

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Ambient Light Sensor Replacement (See: Lighting and Horns/Ambient Light Sensor/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for HVAC control module replacement, setup, and

programming

B0188

DTC B0183 or B0188

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 Descriptors

DTC B0183 02

- Solar Load Sensor 1 Circuit Short to Ground

DTC B0183 05

- Solar Load Sensor 1 Circuit Short to Battery or Open

DTC B0188 02

- Solar Load Sensor 2 Circuit Short to Ground

DTC B0188 05

- Solar Load Sensor 2 Circuit Short to Battery or Open

Diagnostic Fault Information

Circuit Description

The sunload sensor is a 2-wire photo diode. The vehicle uses left and right sunload sensors. The two sensors are integrated into the sunload sensor

assembly along with the ambient light sensor. Ground and signal circuits enable the sensors to operate. As the sunload increases, the sensor signal

decreases. The sensor signal varies between 0 and 5 volts. The HVAC control module converts the signal to a range between 0 and 255 counts. The

sunload sensor provides the HVAC control module with a measurement of the amount of light shining on the vehicle. Bright or high intensity light

causes the vehicles interior temperature to increase. The HVAC system compensates for the increased temperature by diverting additional cool air

into the vehicle.

The following DTCs are for the left and right sunload sensors.

* B0183 is for the left sunload sensor.

* B0188 is for the right sunload sensor.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

The HVAC control module detects the signal circuit is less than 5 counts or greater than 250 counts.

Action Taken When the DTC Sets

* The driver information center (DIC) will display SERVICE A/C SYSTEM.