GM Service Manual Online
For 1990-2009 cars only

Diagnostic Fault Information

Important: Always perform the Diagnostic System Check - Vehicle

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

DIC Switch Signal Circuit

1

1

P3567

P3567

DIC Switch Ground Reference Circuit

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1

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1. Driver Information Center (DIC) Switch(es) Inoperative

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 reference. 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, TRIP/FUEL INFO, DIC VEHICLE INFO, PERSONALIZATION-- corresponds to a certain resistance value. The IPC determines the switch state by the voltage drop across the resistors. A stuck switch or a short to battery sets a DTC.

Reference Information

Schematic Reference

Instrument Cluster Schematics

Connector End View Reference

    •  Instrument Panel, Gages, and Console Connector End Views
    •  Inline Harness 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.
  3. If greater than 1 ohm, test the ground reference circuit for an open/high resistance.
  4. Ignition ON, verify that all scan tool DIC Switch parameters are Inactive.
  5. 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).
  6. 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.
  7. 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.
  8. 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.

    •  Driver Information Display Switch Replacement
    •  Control Module References for the IPC replacement, setup and programming.