2010 Cadillac CTS Sedan AWD V6-3.6L Page 591

2010 Cadillac CTS Sedan AWD V6-3.6L Page 591

DIC Switch parameters, except the DIC Fuel Info. parameter are Active.

瀚慖f any are not Active, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the IPC.

6. Ignition ON, install a 3A fused jumper wire between the signal circuit terminal 3 and ground. Verify the scan tool DIC Fuel Info. parameter

is Active.

瀚慖f not Active, test the signal circuit for a short to voltage or and open/high resistance. If the circuit tests normal, replace the IPC.

7. If all the circuits test normal, test or replace the DIC switch.

Repair Instructions

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

* Driver Information Display Switch Replacement (See: Accessories and Optional Equipment/Driver / Vehicle Information Display

Switch/Service and Repair)

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

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 02

- Rear Fog Lamp Switch Circuit Short to Ground

Diagnostic Fault Information

Circuit/System Description

The rear fog lamp relay is supplied with battery voltage at all times from the REAR FOG fuse located in the rear fuse block. The rear fog lamp

switch signal circuit is grounded momentarily by pressing the rear fog lamp switch. The body control module (BCM) energizes the rear fog lamp

relay by applying ground to the rear fog lamp relay control circuit. When the rear fog lamp relay is energized, the relay switch contacts close and

battery voltage is applied through the REAR FOG fuse to the rear fog lamp supply voltage circuit which illuminates the rear fog lamps.

Conditions for Running the DTC

Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

The BCM detects a short to ground in the rear fog lamp switch signal circuit.

Actions Taken When the DTC Sets

The rear fog lamps will not operate when the park lamps are ON.