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 | P3567 | P3567 |
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. The DIC switch is also used for the head-up-display (HUD) if the vehicle is equipped with a HUD. The switch then functions as the HUD/DIC/Dimmer switch. The instrument panel cluster (IPC) only monitors the DIC switch switch inputs. The dimmer switch is monitored by the instrument panel module (IPM) and the HUD switch inputs is monitored by the HUD module. Battery power is provided to the DIC switch via the instrument panel cluster (IPC). The IPC also provides the DIC switch with a ground reference. The switch input to the IPC 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 - INFO UP, INFO DOWN, INFO RESET, ENGLISH/METRIC, TRIP RESET- corresponds to a certain resistance value. The IPC determines the switch pressed by the voltage drop across the resistors.
The TRIP A/B switch is monitored on a separate circuit provided by the IPC.
Reference Information
Schematic Reference
Connector End View Reference
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 low reference circuit and ground.
- Ignition ON, scan tool installed, verify that all scan tool DIC Switch parameters in the IPC Data List are Inactive.
- Ignition ON, install a 3A fused jumper wire between the DIC switch signal circuit and the low 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 low reference circuit for an open/high resistance. |
| ⇒ | 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). |
| ⇒ | If not Active, test the 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. |
