2010 Cadillac CTS Sedan AWD V6-3.6L Page 589

2010 Cadillac CTS Sedan AWD V6-3.6L Page 589

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the CHMSL.

2. Ignition OFF, test for less than 5.0 ohm between the ground circuit terminal B and ground.

瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.

3. Connect a test lamp between the control circuit terminal A and the ground circuit terminal B.

4. Ignition ON, turn the stop lamps ON and OFF by applying and releasing the brake pedal. The test lamp should turn ON and OFF when

changing between the selected states.

瀚慖f the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.

瀚慖f the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the BCM.

5. If all circuits test normal, replace the CHMSL.

Repair Instructions

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

* High Mount Stop Lamp Replacement (Sedan, V-Series) (See: Lighting and Horns/Center Mounted Brake Lamp/Service and Repair)High

Mount Stop Lamp Replacement (Wagon) (See: Lighting and Horns/Center Mounted Brake Lamp/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming

B3567

DTC B3567

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 B3567 01

- Driver Information Center Select Switch Circuit Short to Battery

DTC B3567 59

- Driver Information Center Select Switch Circuit/Component Protection Time-Out

Diagnostic Fault Information

Circuit/System Description

The driver information center (DIC) switch is a multiplexed switch. Battery power is provided to the DIC switch via the instrument panel cluster

(IPC). The DIC switch signal circuit is pulled up to battery voltage in the IPC. The IPC also provides the DIC switch with a low reference. The

switch input to the IPC is pulled low when a switch is activated. The DIC switch is a momentary contact switch that connects a series of resistors in

a resistor ladder format. The IPC monitors the DIC switch signal circuit to determine the DIC switch inputs. Each switch state - Set/Reset,

Trip/Fuel, Vehicle Information, Personalization, INFO UP, INFO DOWN - corresponds to a certain resistance value. The IPC determines the

switch pressed by the voltage drop across the resistors.

Conditions for Running the DTC

The ignition is in ACCESSORY or RUN.