Driver Information Center (DIC) Switch Inoperative

Driver Information Center (DIC) Switch Inoperative

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information






Circuit/System Description

The driver information center (DIC) switch is a multiplexed switch. The DIC switch is a momentary contact switch that connects a series of resistors in a resistor ladder format. Battery power is provided to the DIC switch via the instrument panel cluster (IPC) with the DIC switch signal circuit 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 or grounded when a switch is activated. The IPC monitors the DIC switch signal circuit to determine the DIC switch inputs. Each switch state - Set/Reset, Trip/Fuel, Vehicle Information, Personalization - corresponds to a certain resistance value. The IPC determines the switch pressed by the voltage drop across the resistors. A stuck switch or a short to battery sets a DTC.

The trip/fuel switch is monitored on a separate circuit provided by the IPC. The trip/fuel switch signal circuit is monitored for a stuck switch but not a short to battery.

Diagnostic Aids

When the trip/fuel switch is stuck, all other DIC switches functions correctly. When any of the DIC switches are stuck, only the trip/fuel switch functions correctly.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the driver information center (DIC) switch.
2. Ignition OFF, test for less than 1 ohm between the low reference circuit terminal 2 and ground.

^ If greater than the specified value, test the circuit for an open/high resistance.

3. Ignition OFF, test for less than 1 ohm between the ground circuit terminal 5 and ground.

^ If greater than the specified value, test the circuit for an open/high resistance.

4. Ignition ON, test for B+ between the following DIC switch signal circuit and ground.

* DIC Switch Signal Circuit Terminal 1
* DIC Select Menu Switch Signal Terminal 3

^ If less than the specified value, test the appropriate signal circuit for a short to ground. If the circuit tests normal, test or replace the IPC.

^ If greater than the specified value, test the appropriate signal circuit for a short to voltage. If the circuit tests normal, test or replace the IPC.

5. Ignition ON, verify a test lamp illuminates between the appropriate DIC switch signal circuit and ground.

^ If the test lamp does not illuminate, test the appropriate signal circuit for an open/high resistance. If the circuit tests normal, replace the IPC.

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

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Driver Information Display Switch Replacement