2010 Cadillac Truck SRX FWD V6-3.0L Page 669

2010 Cadillac Truck SRX FWD V6-3.0L Page 669

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.

2. Test for less than 10 ohm between the temperature sensor ground circuit terminal B and ground.

瀚慖f greater than the specified value, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the K33 HVAC

Control Module.

3. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal A and ground.

瀚慖f less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the

K33 HVAC Control Module.

瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K33 HVAC Control

Module.

4. If all circuits test normal, replace the temperature sensor.

Repair Instructions

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

* HVAC Component Replacement Reference (See: Heating and Air Conditioning/Service and Repair/Removal and Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning)

B3588

DTC B3588

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 B3588 00

- Rear Fog Lamp Switch Circuit Malfunction

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) supplies a reference voltage to the backlight dimmer switch, which is part of the headlamp switch. When the

backlight dimmer switch is placed in a desired brightness position, reference voltage is applied through the backlight dimmer switch resistor ladder

to the BCM. The BCM interprets this voltage signal and will command the interior lights to the desired brightness, command the front fog lamps or

the rear fog lamps depending upon the switch setting selected.

Conditions for Running the DTC

* The ignition is turned ON.

* Low beam or front fog lamps illuminated.

* Rear fog lamp switch activated.

Conditions for Setting the DTC

Rear fog lamp switch stuck.

Action Taken When the DTC Sets