2010 Cadillac Truck SRX FWD V6-3.0L Page 238

2010 Cadillac Truck SRX FWD V6-3.0L Page 238

If the DTC is set, replace the appropriate K96L left mirror control module or the S79P passenger window switch.

Repair Instructions

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

Control Module References (See: Testing and Inspection/Programming and Relearning)for left mirror control module or passenger window switch

replacement, setup, and programming

B0158

DTC B0158

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 B0158 02

- Ambient Air Temperature Sensor Circuit Short to Ground

DTC B0158 05

- Ambient Air Temperature Sensor Circuit High Voltage/Open

Diagnostic Fault Information

Circuit/System Description

The instrument cluster provides the ambient air temperature sensor with a low reference circuit and 5 V signal circuit. The instrument cluster

monitors the voltage drop across the sensor, which is proportional to temperature. When the ambient air temperatures are cold, the resistance of the

sensor is high and the voltage signals are high. When the ambient air temperatures are hot, the resistance of the sensors is low and the voltage

signals are low. The instrument cluster converts the voltage value to a temperature value of Celsius or Fahrenheit that will be displayed by the

driver information center.

Conditions for Running the DTC

The system voltage is between 9-16 V

Conditions for Setting the DTC

B0158 02

The instrument cluster detects the sensor signal circuit is greater than 88掳C (190掳F).

B0158 05

The instrument cluster detects the sensor signal circuit is less than -40掳C (-40掳F).

Action Taken When the DTC Sets

The instrument cluster uses a default air temperature value for further calculations. The driver information center displays ---掳C ( ---掳F).

Conditions for Clearing the DTC

The DTC will become history if the instrument cluster no longer detects a malfunction.