For 1990-2009 cars

### Diagnostic Fault Information

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

### Circuit/System Description

The driver information buttons are normally open momentary switches. Power is provided to the driver information centre (DIC) switches via the instrument panel cluster (IPC) ignition voltage circuit. The button input to the instrument panel cluster (IPC) is pulled low or grounded when a button is activated. The IPC reads the voltage at the analog input to determine which button(s) is pressed.

### Reference Information

#### Schematic Reference

Instrument Cluster Schematics

#### Connector End View Reference

Component Connector End Views

#### Electrical Information Reference

• | Circuit Testing.

• | Connector Repairs.

• | Testing for Intermittent Conditions and Poor Connections.

• | Wiring Repairs.

#### Scan Tool Reference

Control Module References.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the DIC switch assembly.
2. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit of the DIC switch assembly harness connector and a known ground.

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

3. Ignition ON, using a scan tool verify all of the DIC Switch parameters are Inactive.

⇒ | If any are not Inactive, test the signal circuit for a short to ground. If the circuit tests normal, replace the IPC.

4. Ignition ON, install a 3-amp fusible link wire between the signal circuit of the DIC switch assembly harness connector and a known ground. Verify all of the scan tool DIC Switch parameters are Active.

⇒ | If 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.

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

### Repair Instructions

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

Control Module References for IPC replacement, setup, and programming