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 |
|---|---|---|---|
DIC Switch(es) Signal Circuit(s) | 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 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, Info Up, Info Down, Options - corresponds to a certain resistance value. The IPC determines the switch state by the voltage drop across the resistors.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Driver Information Center (DIC) Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the driver information center (DIC) switch assembly.
- Ignition OFF, test for less than 1 ohm of resistance between the DIC switch ground circuit terminal 7 and ground.
- Ignition ON, verify that all scan tool DIC Switch parameters are Inactive.
- 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 all circuits test normal, test or replace the DIC switch.
| ⇒ | If greater than 1 ohm, test the ground circuit for an open/high resistance. |
| ⇒ | If any DIC switch parameter(s) is not Inactive, test the suspect switch signal circuit for a short to ground. If the circuit tests normal, replace the instrument panel cluster (IPC). |
| ⇒ | If any DIC switch parameter(s) is 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. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for the IPC replacement, setup and programming |
