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 | 1 | 1 | P3567 | P3567 |
DIC Select Switch Signal | 1 | 1 | 1 | P3567 |
DIC Switch Low Reference | -- | 1 | -- | -- |
DIC Switch Ground | -- | 1 | -- | -- |
1. Driver Information Center (DIC) Switch Malfunction | ||||
Circuit/System Description
The driver information center (DIC) switch is a multiplexed switch. The DIC switch is a momentary contact switch that connects a series of resistors in a resistor ladder format. 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 low reference. The switch input to the IPC is pulled low or grounded when a switch is activated. The IPC monitors the DIC switch signal circuit to determine the DIC switch inputs. Each switch state - Set/Reset, Trip/Fuel, Vehicle Information, Personalization - corresponds to a certain resistance value. The IPC determines the switch pressed by the voltage drop across the resistors. A stuck switch or a short to battery sets a DTC.
The trip/fuel switch is monitored on a separate circuit provided by the IPC. The trip/fuel switch signal circuit is monitored for a stuck switch but not a short to battery.
Diagnostic Aids
When the trip/fuel switch is stuck, all other DIC switches functions correctly. When any of the DIC switches are stuck, only the trip/fuel switch functions correctly.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Driver Information Center (DIC) Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, verify that when the DIC switches are pressed and released, the DIC display changes as selected.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the driver information center (DIC) switch.
- Ignition OFF, test for less than 1 ohm between the low reference circuit terminal 2 and ground.
- Ignition OFF, test for less than 5 ohms between the ground circuit terminal 5 and ground.
- Ignition ON, test for B+ between the switch signal circuit terminal 1 and ground.
- Ignition ON, verify a test lamp illuminates between the signal circuit terminal 1 and ground.
- Ignition ON, test for B+ between the signal circuit terminal 3 and the ground circuit terminal 5.
- Ignition ON, verify a test lamp illuminates between the signal circuit terminal 3 and the ground circuit terminal 5.
- If all circuits test normal, test or replace the DIC switch.
| ⇒ | If greater than the specified value, test the low reference circuit for an open/high resistance. |
| ⇒ | If greater than the specified value, test the ground circuit for an open/high resistance. |
| ⇒ | If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, test or replace the IPC. |
| ⇒ | If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the IPC. |
| ⇒ | If the test lamp does not illuminate, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the IPC. |
| ⇒ | If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, test or replace the IPC. |
| ⇒ | If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the IPC. |
| ⇒ | If the test lamp does not illuminate, test the signal circuit for 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 |
