C0459

Cruise Control

Pinpoint Test T: DTC C1132:4B Or DTC U0459:68

Normal Operation

The Head Up Display (HUD) module is designed with a temperature sensor internal to the module. Due to extremely hot weather conditions, the temperature sensor circuit allows the HUD (Head Up Display) module to disable under high temperature conditions, which could damage the HUD (Head Up Display) module LEDs. The HUD (Head Up Display) module is designed with a LED prove-out test. Upon each ignition cycle when the ignition switch is in RUN, the LEDs illuminate for a period of time indicating the HUD (Head Up Display) module is functional.

- DTC C1132:4B (Head Up Display: Over Temperature)- sets as a continuous memory and on-demand DTC in the Cruise-Control Module (C-CM) if the HUD (Head Up Display) module is over-temperature.

- DTC U0459:68 (Invalid Data Received From Head Up Display: Event Information)- sets as a continuous memory in the Cruise-Control Module (C-CM) when network communication is lost from the HUD (Head Up Display) module or if the HUD (Head Up Display) module is over-temperature.

This pinpoint test is intended to diagnose the following:

- HUD (Head Up Display) module

- Network communication

PINPOINT TEST T : DTC C1132:4B OR DTC U0459:68

T1 CHECK THE COMMUNICATION NETWORK

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: Network Test.

- Carry out the network test.

Does the HUD (Head Up Display) module pass the network test?

Yes
GO to T2.

No
REFER to Information Bus, The HUD (Head Up Display) module Does Not Respond To The Scan Tool Pinpoint Test T: The Head Up Display (HUD) Module Does Not Respond To The Scan Tool.

T2 CHECK FOR HUD (Head Up Display) MODULE LED PROVE-OUT TEST

NOTE: Remove the vehicle from the extreme heat source or sunload condition prior to testing the vehicle.

- Ignition ON.

- While placing the ignition switch in RUN, observe the HUD (Head Up Display) module LEDs

Do the HUD (Head Up Display) module LEDs illuminate?

Yes
The HUD (Head Up Display) module LEDs are operating correctly at this time. The concern may have been caused by extreme temperatures. TEST the system for normal operation.

No
GO to T3.

T3 CHECK THE DTCs FROM THE HUD (Head Up Display) MODULE SELF-TESTS

- Check the HUD (Head Up Display) module DTCs from the self-tests.

Are any HUD (Head Up Display) module DTCs recorded?

Yes
REFER to Fire Suppression System.

No
GO to T4.

T4 CHECK FOR CORRECT HUD (Head Up Display) MODULE OPERATION

- Disconnect the HUD (Head Up Display) module connector.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect the HUD (Head Up Display) module connector and make sure it seats correctly.

- Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new HUD (Head Up Display) module. CLEAR the DTCs. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.