Driver Information Center (DIC) Switch(es) Inoperative

Driver Information Center (DIC) Switch(es) Inoperative

Diagnostic Fault Information

Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview






Circuit/System Description

The driver information center (DIC) switch is a multiplexed switch that functions as a DIC/Dimmer switch. 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 ground. The switch input to the cluster is pulled low or grounded 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, Fuel, Trip, Options, Gage - corresponds to a certain resistance value. The IPC determines the switch state by the voltage drop across the resistors.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the driver information center (DIC) switch assembly.
2. Ignition OFF, test for less than 1 ohm of resistance between the DIC switch ground and ground.

• If greater than 1 ohm, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that all scan tool DIC Switch parameters are Inactive.

• If all DIC switch parameters are not Inactive, test the suspect switch signal circuit for a short to ground. If the circuit tests normal, replace the instrument panel cluster (IPC).

4. Ignition ON, install a 3-Amp fused jumper wire between the signal circuit and the ground reference circuit. Verify that all scan tool DIC switch parameters are Active.

• If not Active, test the suspect DIC switch signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the IPC.

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

Repair Instructions

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Refer to Programming and Relearning.Programming and Relearning