• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
DIC Switch Signal Circuit | -- | -- | B3567 01 | B3567 59 |
HUD Switch Signal Circuit | -- | -- | B3567 01 | B3567 59 |
The driver information switches are normally open momentary switches. Power is provided to the driver information center (DIC) switches via the instrument panel cluster (IPC) ignition 1 voltage circuit. The IPC ignition 1 voltage circuit is fused in the body control module (BCM). The IPC interfaces with the DIC switches via 3 discreet circuits. The switch input to the cluster is pulled low or grounded when a switch is activated. The IPC reads the voltage at the analog input to determine which switch(es) is pressed. The switch input to the cluster is set up in a resistor ladder format. The DIC switches include the PERSONALIZATION, SET/RESET, TRIP/FUEL, AND VEHICLE INFO switches. A stuck switch or a short to battery sets a DTC.
The head-up display (HUD) is a display system that optically projects vehicle information onto the windshield. The HUD has an electric tilt adjust that is controlled by the up and down switches. Operating these switches directs the motor to move the HUD image up or down on the windshield. There is also a page switch that can scroll through multiple messages present on the HUD. The HUD is also equipped with automatic dimming. Dimming is also controlled by a HUD dimmer switch. All three switches control the HUD by grounding the HUD switch input signals to ground. The dimmer switch uses a variable resistor to control HUD intensity where the lower the resistance, the brighter the HUD display.
The ignition is in ACCESSORY or RUN.
• | The IPC detects that the DIC switch is stuck or the HUD detects that the HUD switch is stuck. |
• | The IPC detects that the DIC switch signal circuit is shorted to battery or the HUD detects that the HUD switch signal circuit is shorted to battery. |
The IPC ignores the DIC switch inputs or the HUD ignores the HUD switch inputs.
• | The DTC becomes history when the conditions for setting the DTC are no longer present. |
• | The history DTC clears after 40 malfunction-free warm-up cycles. |
• | The IPC or the HUD receives a clear code command from the scan tool. |
• | When the DIC switches are stuck, only the TRIP/FUEL switch functions correctly. When the TRIP/FUEL switch is stuck, all other DIC switches function correctly. |
• | Only the DIC signal circuit can be diagnosed as shorted to battery. |
⇒ | If not Inactive, replace the IPC. |
⇒ | If not Active, test the DIC signal circuit of the DIC switch assembly for a short to voltage. If the circuit tests normal, replace the IPC. |
⇒ | If not Active, test the trip/fuel signal circuit of the DIC switch assembly for a short to voltage. If the circuit tests normal, replace the IPC. |
⇒ | If not Inactive, replace the HUD. |
⇒ | If not Active, test the signal circuit of the HUD switch assembly for a short to voltage. If the circuit tests normal, replace the HUD. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for the IPC or HUD replacement, setup and programming |