For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | 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 | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
DIC Switch Signal Circuit | 1 | 1 | 1 | --
DIC Switch Ground Reference Circuit | -- | 1 | -- | --
1. Driver Information Center (DIC) Switch(es) Inoperative

### Circuit/System Description

The driver information center (DIC) switch(es) are normally open momentary switch(es). 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 battery positive voltage circuit is fused in the body control module (BCM). The instrument panel cluster (IPC) interfaces with the driver information center (DIC) switch(es) via two discreet circuits. The switch(es) input to the cluster is pulled low or grounded when a switch is activated. The IPC reads the voltage at the analog input to determine which switch(es) is pressed. The switch(es) input to the cluster is set up in a resistor ladder format. The DIC switch(es) include the INFO and the SET/RESET switches. A simultaneous press and hold of the INFO and SET/RESET switch activates the MENU switch. The MENU switch is the third embedded switch used to activate the various DIC personalization menus.

### Reference Information

#### Schematic Reference

• | Instrument Cluster Schematics

• | Power Distribution Schematics

• | Ground Distribution Schematics

#### Connector End View Reference

• | Displays and Gages Connector End Views

• | Power and Grounding Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Scan Tool Data List

### 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 ground reference circuit and ground.

⇒ | If greater than 1 ohm, test the ground reference 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 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 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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Steering Wheel Control Switch Assembly Replacement

• | Control Module References for the IPC replacement, setup, and programming